Kenneth J. Ivin - Storming Media

Ring-Opening Metathesis Polymerization of (+) and (+ or -)-endo,exo-5,6- Dimethylbicyclo(2.2.1)hept-2-ene by Mo(CH-t-Bu)(N-2,6-C6H3-i-Pr2)(OR)2

20 OCT 93

31 pages

Authors: Tadahiro Sunaga; Kenneth J. Ivin; Gretchen E. Hofmeister; John H. Oskam; Richard R. Smrock; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY

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Ring-opened polymers of (+)- and (-)-endo,exo-5,6-dimethylbicyclo2.2. 1hept-2-ene (1) having cis double bond contents between 5 and 85% were prepared using Mo(CH-t-Bu)(NAr)(OR)2 (Ar = 2,6-C6H3-i-Pr2; OR = OCMe3, OCMe2(CF3), OCMe(CF3)2) complexes as initiators. The cis content of the polymers increased in proportion to the electron-withdrawing power of the alkoxide ligands. 13C NMR spectra (125 MHz) of these polymers were interpreted in terms of the various possible types of dyad structure: XX, ...