NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

18 JUL 1969

Authors: R. W. Munn; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

The negative coefficient of thermal expansion parallel to the tetragonal axis of indium at room temperature is interpreted in terms of the elastic properties of the lattice. A suggestion that the negative thermal expansion implies a negative linear compressibility in the same direction is refuted. (Author)

PHONON-LIMITED TRANSPORT OF CHARGE CARRIERS IN MOLECULAR CRYSTALS,

10 JUL 1969

Authors: R. W. Munn; W. Siebrand; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

For strong electron-phonon interactions, the mobilities of charge carriers in molecular crystals can be limited by phonon velocities. A model calculation of mobilities and their temperature dependence including this limit gives results in good agreement with experiment for anthracene. (Author)

THE THERMODYNAMIC PROPERTIES OF BINARY AROMATIC SYSTEMS. III. EXCESS ENTHALPIES AND VOLUMES OF ISOMERIC XYLENE MIXTURES AT 25 C,

23 JUN 1969

Authors: V. T. Lam; S. Murakami; g. c. benson; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Excess enthalpies and excess volumes were measured at 25C for the systems o-xeylene+m-xylene, o-xylene+p-xylene, and m-xylene+p-xylene. Analyses of the results in terms of the theories of Flory and of Barker are described. (Author)

The Manipulation of Volatile Solutes and Solvents in Infrared Spectrophotometry,

16 JUN 1969

Authors: A. Nadeau; R. N. Jones; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A new type of weighing flask is described suitable for the preparation of quantitative solutions in volatile solvents. It allows the direct transfer of the solution to an infrared absorption cell without the intermediary use of a pipette, syringe or other transfer device. It also permits the recovery of the quantitative solution after the measurement. Two modifications of the flask are illustrated, one of which will deal with volatile solutes ...

AN ISOTHERMAL DILUTION CALORIMETER FOR MEASURING ENTHALPIES OF MIXING,

11 JUN 1969

Authors: S. Murakami; g. c. benson; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Anisothermal dilution calorimeter of the Van Ness type is described. The calorimeter is suitable for studying either endothermic or exothermic mixing. Results of measurements of enthalpies of mixing are presented for the systems benzene + carbon tetrachloride, benzene + cyclohexane, cyclohexane, cyclohexane + n-hexane, p-dioxane + carbon tetrachloride, and benzene + dichloromethane at 25C, and for the system dichloromethane + p-dioxane at 30C. The performance of the ...

MOLECULAR MOTIONS IN SOLID ISOTOPIC SILANES,

09 JUN 1969

Authors: M. L. Klein; J. A. Morrison; R. D. Weir; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The paper reports the results of measurements of some thermodynamic properties (heat capacities, vapour pressures, density, heats of fusion) of two silanes, SiH4 and SiHD3, over a wide temperature range above T = 2.8K. These results together with published ones from other kinds of experiments are compared with the more extensive data that are available for the solid isotopic methanes. The similarities and differences are used for making deductions about ...

POLARITON-PHONON INTERACTION IN MOLECULAR CRYSTALS,

02 JUN 1969

Authors: C. Mavroyannis; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A general theory is presented concerning the interaction between the polaritons and the acoustic phonons in molecular crystals. The average energy of the crystal resulting from the polariton-phonon interaction at finite temperatures has been derived in a closed form. (Author)

PHONON ENHANCEMENT IN ELECTRONIC THERMAL EXPANSION,

03 MAY 1969

Authors: R. W. Munn; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Recent calculations of the pressure dependence of superconducting transition temperatures permit calculation of the phonon-enhancement contribution to the Gruneisen function for electronic thermal expansion in the normal state. For lead the enhancement exceeds the total measured values. (Author)

INTEGRAL TRANSFORM FUNCTIONS. A SIMPLE NONEXPONENTIAL ORBITAL FOR THE He SERIES,

14 APR 1969

Authors: R. L. Somorjai; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Calculations were carried out on the He isoelectronic series with a simple, two-parameter Laplace transform kernel which has a non-exponential transform. Close to Hartree-Fock accuracy was obtained. A physically plausible criterion for selecting kernels is given. (Author)

THE EPR SPECTRUM OF BENZO(cd)PYRENYL,

11 APR 1969

Authors: A. H. Reddoch; D. H. Paskovich; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The neutral radical of the odd alternate hydrocarbon 3H-Benzo (cd) pyrene was prepared and an EPR (electron paramagnetic resonance) spectrum measured. (Author)

CALCULATION OF THE ISOTOPE EFFECT ON THE TRIPLET LIFETIME OF PARTIALLY DEUTERATED NAPHTHALENES,

03 APR 1969

Authors: B. R. Henry; W. Siebrand; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Differences in triplet lifetime between alpha and beta deuterated naphthalenes are calculated in good agreement with experiment. The calculation is based on vibronic spin-orbit coupling involving sigma pi* and pi sigma* states together with CH out-of-plane bending modes. (Author)

SCHLIEREN PHOTOGRAPHY USING A MODE-LOCKED LASER AS THE LIGHT SOURCE,

18 MAR 1969

Authors: K. Hamal; c. demichelis; A. J. Alcock; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The extremely short pulses of coherent radiation emitted by a mode-locked laser permit the extension of conventional Schlieren photography to events requiring exposure times of a few picoseconds and framing rates in the gigacycle range. The usefulness of this technique has been investigated by studying the initial development of a laser-produced plasma. The experimental set-up employed a Neodymium: glass laser, Q-spoiled by means of a saturable dye, emitting a 400 ...

THE THERMODYNAMIC PROPERTIES OF BINARY AROMATIC SYSTEMS. II. EXCESS ENTHALPIES AND VOLUMES OF BENZENE + TOLUENE AND TOLUENE + ISOMERIC XYLENE MIXTURES AT 25C,

11 MAR 1969

Authors: S. Murakami; V. T. Lam; g. c. benson; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Excess enthalpies and volumes of the four binary systems formed by mixing toluene with benzene, o-xylene, m-xylene, and p-xylene were measured at 25C. These results along with similar results for benzene + isomeric xylene systems were analyzed in terms of the theories of Flory and of Barker. Each approach provides a reasonable, but limited, basis for correlation of the results. (Author)

IONIC CONDUCTIVITY OF CRYSTALLINE CsBr,

24 JAN 1969

Authors: A. V. Chadwick; B. D. McNicol; A. R. Allnatt; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The electrical conductivity of pure CsBr was measured between 295 and 895K and the results analysed by least squares. Schottky disorder provides an adequate description of the results for the intrinsic conductivity except at the highest temperatures. The predicted diffusion coefficients are compared with the experimental values of Lynch. (Author)

GAS PHASE RAMAN INTENSITIES: A REVIEW OF 'PRE-LASER' DATA,

20 JAN 1969

Authors: W. F. Murphy; W. Holzer; H. J. Bernstein; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Raman radiant intensities and depolarization ratios measured for gases with mercury are irradiation and photoelectric detection have been collected. The observed intensities have been reduced to values of the scattering activity. The scattering activity and Raman scattering cross sections are explicitly related. Data for strong sharp bands are accurate to about plus or minus 5%-10%, while data for weak and broad bands are less accurate. (Author)

THRESHOLD IONIZATION EFFICIENCY CURVES FOR MONOENERGETIC ELECTRON IMPACT ON H2, D2, CH4 and CD4,

03 JAN 1969

Authors: F. P. Lossing; G. P. Semeluk; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

With a combined electron energy selector and quadrupole mass analyzer, the ionization efficiency for electron impact on hydrogen, deuterium, methane and deuteromethane was investigated. The electron beam distribution had an energy width at half-height of about 0.06V. (Author)

SPIN - ORBIT COUPLING IN AROMATIC HYDROCARBONS. THE RADIATIVE TRIPLET LIFETIME OF NAPHTHALENE,

02 JAN 1969

Authors: Bryan R. Henry; Willem Siebrand; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A radiative triplet lifetime of 15 sec is calculated for naphthalene on the basis of sigma-pi interaction, involving singlet and triplet pi-sigma* and sigma-pi* states.

THE THERMAL EXPANSION OF AXIAL METALS,

1969

Authors: R. W. Munn; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The thermal expansion of axial metals is surveyed with particular reference to recent very low temperature data for zinc, cadmium, magnesium, beta-tin, indium, bismuth and antimony. (Author)

INTEGRAL TRANSFORM FUNCTIONS. A NEW CLASS OF APPROXIMATE WAVE FUNCTIONS,

26 AUG 1968

Authors: R. L. Somorjai; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The construction of a new class of approximate wave functions by integral transforms is described. Slater and Gaussian type functions correspond to special, limiting cases of the new class. Some of the conceptual and practical advantages associated with the new functions are discussed. (Author)

THE CRYSTAL STRUCTURE OF 1,5-ENDOMETHYLENEQUINOLIZIDINIUM p-TOLUENESULPHONATE,

20 JUN 1968

Authors: Carol Saunderson Huber; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The tosyl ester of the alkaloid lupinine cyclizes when heated, and the rearrangement product has been shown by a three-dimensional structure analysis to be 1,5-endomethylenequinolizidinium p-toluenesulphonate, (C10H18N)(+)(C7H7SO3)(-). The heavy-atom method was used to solve the structure, and refinement by block-diagonal least-squares techniques led to a final residual of 0.067 for 1793 observed reflexions. The two trans-fused six-membered rings comprising the quinolizidine ring system are in distorted chair forms, and the ...

A TWO-STAGE DOUBLE-HEMISPHERICAL ELECTRON ENERGY SELECTOR,

07 JUN 1968

Authors: K. Maeda; G. P. Semeluk; F. P. Lossing; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The construction and performance of a two-stage electron energy selector of the double-hemispherical type are described. Energy half-widths of 0.06-0.12 V in the electron beam have been obtained with operating voltages of 10-30 V in the hemispherical stages. No magnetic shielding was employed. Resolved electron currents at a half-width of 0.07 V were obtained, in the form of a well-collimated beam which was passed axially through a cylindrical reaction chamber. ...

ACETYLENIC FATTY ACIDS OF PYRULARIA PUBERA SEED OIL,

13 MAY 1968

Authors: C. Y. Hopkins; A. W. Jevans; Mary J. Chisholm; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Pyrularia pubera seed oil contains octadeca-trans-11,17-dien-9-ynoic, 8-hydroxyoctadeca-trans-11,17-dien-9-ynoic, ximenynic, oleic, and other acids. The total fatty acid composition of the oil is estimated. threo-10,11-Dihydroxyheptadec-8-ynoic and threo-11,12-dihydroxyoctadec-9-ynoic acids were prepared. (Author)

THEORETICAL EVALUATION OF ANHARMONIC CONTRIBUTIONS TO RADIATIONLESS TRANSITIONS IN AROMATIC HYDROCARBONS,

22 APR 1968

Authors: W. Siebrand; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A previously derived expression for Franck-Condon factors of radiationless transitions in aromatic hydrocarbons contains a semi-empirical anharmonicity parameter. It is shown that this parameter can be calculated accurately on the basis of Morse potentials. (Author)

PREPARATION OF HIGH-PURITY ANTHRACENE: ZONE REFINING AND THE TRIPLET LIFETIME,

05 MAR 1968

Authors: Y. Lupien; D. F. Williams; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The triplet lifetime has been used as a monitor to follow the progress of purification during the zone-refining of natural and synthetic anthracene. Chromatography has been found to be a satisfactory initial purification process if a highly pure solvent, e.g. benzene, is used. (Author)

THE HEAT OF DIMERIZATION OF SOME CARBOXYLIC ACIDS IN THE VAPOUR PHASE DETERMINED BY A SPECTROSCOPIC METHOD,

28 FEB 1968

Authors: A. D. H. Clague; H. J. Bernstein; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The lower molecular weight carboxylic acids, formic, acetic, propionic, n-butyric, isobutric and trimethylacetic have been studied to find, firstly, whether there is any trend in thermodynamic properties due to mass or structure of the alkyl substituent, and secondly, to demonstrate the utility and limitations of a simple spectroscopic procedure for the determination of thermodynamic properties. (Author)

CALORIMETRIC STUDIES OF SOME PHYSICAL PHENOMENA AT LOW TEMPERATURES,

1968

Authors: J. A. Morrison; H. Chihara; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The article discusses the measurement of the low temperature surface properties of metal alloys and other materials.

ANHARMONIC CONTRIBUTIONS TO THE HEAT CAPACITIES OF SILICON AND GERMANIUM.

1966

Authors: D. M. T. Newsham; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

THE MAGNETIC CONTRIBUTION TO THE HEAT CAPACITY OF NEODYNIUM AT LOW TEMPERATURES,

17 JUN 1965

Authors: V. Janovec; J. A. Morrison; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

An expression is given for the magnetic contribution to the total heat capacity for neodymium.

THE STRUCTURE OF RETAMINE AND THE PARTIAL SYNTHESIS OF THE (--)-ENANTIOMORPH,

03 MAR 1965

Authors: Kju Hi Shin; L. Fonzes; Leo Marion; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Previous work by many authors has led to the assumption that retamine might be (+)-12-hydroxysparteine. A partial synthesis of the enantiomorph of this compound was effected by dehydration of (+)-13-hydroxylupanine and hydroboration of the product. The dehydration product consisted of two components that were separated by thin-layer chromatography and identified by the characteristics of their nuclear magnetic resonance (n.m.r.) spectra as delta 12,13- and delta 13,14-dehydrolupanine. Hydroboration of the delta ...

THE TEMPERATURE VARIATION OF THE SCATTERING PROPERTIES OF CRYSTALS.

1965

Authors: L. S. Salter; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

THE TEMPERATURE VARIATION OF THE SCATTERING PROPERTIES OF CRYSTALS,

1965

Authors: L. S. Salter; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

It is shown how thermodynamic data (heat capacity, thermal expansion, etc.) may be used to estimate accurately certain scattering properties of crystals, assuming the validity of the quasi-harmonic approximation of lattice dynamics. In particular, DebyeWaller factors and incoherent neutron scattering cross sections can be readily correlated with thermodynamic data even though the form of the lattice frequency distribution of the crystal is not known. Thermodynamic data for vanadium, silicon, germanium ...

THE TETRAENOIC ACID OF TECOMA STANS SEED OIL,

1965

Authors: C. Y. Hopkins; Mary J. Chisholm; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A fatty acid, isolated from the seed oil of Tecoma stans (L.) H.B.K., is shown to be the hitherto unknown octadecatrans-3,cis-9,cis-12,cis-15-tetraenoic acid. It constitutes about 19% of the total fatty acids. (Author)

THE FLOW OF GASES THROUGH MICROPOROUS CARBON,

14 DEC 1964

Authors: R. F. Bartholemew; E. A. Flood; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Flow rates of He, Ar, N2, Kr, methane, propane, and n-butane through a small circular cylinder of microporous 'saran' carbon at 25C were measured. The corresponding adsorption isotherms were also measured. The experimental results are reported. The observed flow rates of propane and butane are compared with those calculated by means of a theoretical equation deduced previously. The theoretical equation is based on a laminar viscous flow of liquid-like films ...

THE REACTION OF ACTIVE NITROGEN WITH MIXTURES OF ETHYLENE AND NITRIC OXIDE,

03 DEC 1964

Authors: E. Fersht; R. A. Back; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The reaction of active nitrogen, produced in a condensed discharge at 1 mm pressure, with mixtures of ethylene and nitric oxide was studied with mixtures ranging in composition from pure ethylene to pure nitric oxide. The sum of HCN + 14N15N produced from mixtures of C2H4 and 15NO remained constant and equal to the HCN produced from pure C2H4 for NO concentrations up to 50 mole %. As more NO ...

COMBINATION REACTIONS OF HYDROXYL RADICALS IN THE FLASH PHOTOLYSIS OF WATER VAPOUR,

10 NOV 1964

Authors: J. Caldwell; R. A. Back; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The yields of hydrogen and oxygen from the flash photolysis of water vapour were measured over a range of flash energy, water vapour pressure, and pressure of added inert gas. Relative rates of the two reactions, 20H+M yields H2O2+M, and 20H yields H2O+O were estimated. These data were combined with earlier results of Black and Porter and of Del Greco and Kaufman to evaluate absolute rate constants for reaction (1) ...

THE STRUCTURE OF INDACONITINE,

14 AUG 1964

Authors: Robert E. Gilman; Leo Marion; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The alkaloid indaconitine has been converted into delphinine by replacement of a secondary hydroxyl by hydrogen and substitution of an imino-methyl for the imino-ethyl group originally present. This correlation rigorously establishes the structure of indaconitine and its absolute configuration. The product of the saponification of indaconitine, pseudaconitine, pseudaconine, is identical with the product of the saponification of pseudaconitine, and this last alkaloid has been correlated previously with aconitine. It follows ...

FURTHER ALKALOIDS RELATED TO ASPIDOALBINE AND LIMASPERMINE,

30 JUL 1964

Authors: C. Ferrari; Leo Marion; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The stem bark of Aspidosperma album (Vahl) R. Ben is shown to contain at least eight more alkaloids than had been reported previously. The new alkaloids have been separated from the extract by a combination of countercurrent distribution and preparative scale thin-layer chromatography. Of these eight alkaloids, five have been definitely characterized and their structure determined. They are the previously known aspidolimidine, together with N-propionyl-N-decetylasppidolimidine, N-acetyl-N-depropionyllimaspermine, N-acetyl-N-depropionylaspidoalbinol, and aspidolimidinol. The ...

Cis-11-Docosenoic Acid in Cod Liver Oil,

28 JUL 1964

Authors: Mary J. Chisholm; C. Y. Hopkins; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

CRYSTAL STRUCTURE OF HETERATISINE HYDROBROMIDE MONOHYDRATE,

23 JUL 1964

Authors: Maria Przybylska; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The space group of heteratisine hydrobromide monohydrate, C22H33O5N.HBr.H2O is P2 sub 1 and the unit-cell dimensions are: a = 8.96, b = 14.54, c = 8.55 A, beta = 90 degrees 40', Z = 2. The structure was solved from a three-dimensional Fourier synthesis by the heavy-atom method. No chemical assumptions were made, except that the nitrogen atom was identified by comparison of the skeleton with that of lycoctonine. Refinement ...

THE PHOTOLYSIS OF FORMALDEHYDE, FORMALDEHYDE-D2, AND THEIR MIXTURES,

29 JUN 1964

Authors: M. Venugopalan; D. O. Kutschke; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

It has been verified that H atoms are formed when formaldehyde vapor at 300 C is illuminated by the 3 655 A group of the mercury arc. Isolation of the group of lines was achieved by a combination of glass and solution filters. This observation gives further support to the high value of D(H-CO). It was found that D2CO also predissociated following absorption at this wavelength. 2this observation is not ...

THE HYDROLYSIS OF T-BUTYL CHLORIDE IN WATER: TEMPERATURE-DEPENDENCE OF THE ENERGY OF ACTIVATION,

29 JUN 1964

Authors: E. A. Moelwyn-Hughes; R. E. Robertson; S. Sugamori; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The Paper reports the results of a careful determination of the temperature-dependence of the rate of hydrolysis of t-butyl chloride in water at 1 degree intervals between 0 and 20C. (Author)

SOME ANOMALOUS CARBONYL STRETCHING FREQUENCIES IN STEROID INFRARED SPECTRA,

22 JUN 1964

Authors: R. Norman Jones; J. B. DiGiorgio; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

THE REACTIONS OF FREE RADICALS WITH NITROUS OXIDE,

19 JUN 1964

Authors: T. N. Bell; K. O. Kutschke; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A study of the reactions of methyl, ethyl, and trifluoromethyl radicals with nitrous oxide has shown that each radical causes the formation of nitrogen at temperatures below 400 degrees. It is believed that the oxygen abstraction reaction occurs. R + N2O yields RO + N2. A semiquantitative study of the reaction of trifluoromethyl with nitrous oxide was made, and difficulties in studying this type of reaction quantitatively are discussed. (Author) ...

OCCURRENCE OF TRANS-3-HEXADECENOIC ACID IN A SEED OIL,

28 MAY 1964

Authors: C. Y. Hopkins; Mary J. Chisholm; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Trans-3-Hexadecenoic acid was found to be a component of the glyceride oil of seeds of Helenium bigelowii A. Gr. It constituted about 10% of the total fatty acids. The acid was isolated and identified by oxidative cleavage and by its infrared and nuclear magnetic resonance (n.m.r.) spectra. Reaction with alkaline permanganate gave 3-hydroxypalmito-y-lactone. Mild alkaline treatment of methyl trans-3-hexadecnoate caused a shift of the double bond to the 2-position. A ...

SYNTHESIS OF 1-PHENYLPROPYNE-2, 3-13C21,

09 APR 1964

Authors: R. N. Renaud; L. C. Leitch; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A method of preparing the title compound from methyl-13C iodide through acetophenone-2-13C, 1-phenylethanol-2-13C, styrene-2-13C dibromide, and 1-phenylacetylene-2-13C is described. The overall yield based on methyl-13C iodide was 24%. (Author)

AZOXYCOMPOUNDS. I. THE PHOTOLYSIS OF AZOXYMETHANE,

31 MAR 1964

4 pages

Authors: B. G. Gowenlock; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

The full text of this report is available for sale.

A study of the photolysis of azoxymethane was made. The reaction products include nitrogen, nitrous oxide, methane, and ethane. The ratio N2:N2O is independent of temperature and two primary photolytic processes are postulated to account for this fact. On the assumption that methane arises from the reaction CH3 + CH3N2OCH3 yields CH4 + CH2N2OCH3, the activation energy of this reaction is 6=2kcal/mole. Other reactions that take place during the photolysis ...

THE THERMAL UNIMOLECULAR DECOMPOSITION OF DELTA 2.5-BICYCLO(2.2.1)HEPTADIENE,

17 MAR 1964

Authors: B. C. Roquitte; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

THE DETECTION OF ELECTRON-PHONON INTERACTIONS THROUGH THE ANALYSIS OF HEAT CAPACITIES OF METALS,

04 MAR 1964

Authors: J. A. Morrison; L. S. Salter; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

THE MERCURY-PHOTOSENSITIZED DECOMPOSITION OF AMMONIA AND AMMONIA-PROPANE MIXTURES,

30 JAN 1964

Authors: S. Takamuku; R. A. Back; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

A study of the mercury-photosensitized decomposition of ammonia, both with pure ammonia and with propane added as a scavenger for hydrogen atoms, suggests that the quantum yield of the primary decomposition into H and NH2 is much less than unity at 33 C and rises with increasing temperature. The interaction of ammonia-propane mixtures with Hg atoms cannot be explained in terms of simple competitive quenching; a tentative mechanism involving a ...

MULTISTAGE DEACTIVATION IN THE PHOTOLYSIS OF HEXAFLUOROACETONE,

23 DEC 1963

Authors: A. N. Strachan; R. K. Boyd; K. O. Kutschke; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

In principle the vibrationally excited molecular in an upper electronic state, formed by absorption in the ultraviolet region of the spectrum, can attain vibrational equilibrium by two mechanisms. In most discussions of this degradation of vibrational energy it has been considered that the data are represented adequately by a singlestep deactivation from high to low vibrational levels rather than by a multistep cascade from one group of vibrational levels to ...