The reaction of borazines, (-BR-NR'-)3, with pyrazole, Hpz, gives mu- pyrazolato-mu-amido diboron species of the type R-(pz)B(mu-pz)mu-NHR')BR(pz) containing a central B2N3 ring system; four compounds of this type with R = C2H5 or C6H5 and R' = H or CH3, respectively, were prepared. Identical species can be obtained on interaction of bis(dimethylaminoboryl)amines of the tyep R'N(BR- N(CH3)2)2 with Hpz; they are closely related to the pyraxabloes, R2B(mu-pz)2BR2, which contain a ...
Tetraorganyldiboryl oxides = 1,3-diboroxanes, (R2B)2O (R = C2H5, C6H5), react at elevated temperatures with excess pyrazole, Hpz, to give an essentially quantitative yield of the corresponding pyrazabole, R2B(mu-pz)2BR2. The 1,3-diboroxane (CH3)2N-BR2O (R = C6H5) reacts with Hpz in refluxing toluene to form the triply-bridged pyrazabole RBB(mu-pz)2(mu-O-BR-O)BR as the major product besides substantial quantities of the diboroxane derivative (pz)rb(mu- pz)2BR20. In the latter, two pyrazabole moieties are linked by an oxygen ...
A series of chain-type polynuclear pyrazolyl-bridged spiro species containing boron and metal centers has been prepared. Reaction of the tetrakis(1-pyrazolyl)borate ion, B(pz)4(-) (Hpz = pyrazole), with one molar equivalent of a metal halide species LMX (L = nonreactive ligands(s); M = metal, e.g., Pd; X = halogen) yielded covalent compounds of the type (pz)2B(mu-pz)2ML; and with two molar equivalents of LMX, trinuclear cationic species of the type LM(mu-pz)2B(mu-pz)2ML(+) were obtained. ...
B-Triorganylboroxines, (-BR-O03, react with pyrazole, Hpz, to yileld pyrazaboles in which the two boron atoms are further bridged by an O-BR-O link, i.e., RB(mu-pz)2(mu-OBRO)BR. The neutral species are structurally related to dibora cations of the type RB(mu-pz)3BR(+). The preparation of the latter by reaction of either tri(1-pyrazolyl)borate(1-) ions, RB(pz)3(-), or the pz(-) ion with trigonal boranes containing two ready leaving groups, R'BX2, has been studied and the first unsymmetrical species ...
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