Dibenzylmagnesium-Initiated Anionic Oligomerizations of trans-Stilbene, 1,1-Diphenylethylene, and α-Methylstyrene in Hexamethylphosphortriamide
作者:
Seiichi Nakahama,
Akira Hirao,
Yasuo Ohira,
Noboru Yamazaki,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1975)
卷期:
Volume 9,
issue 4
页码: 563-574
ISSN:0022-233X
年代: 1975
DOI:10.1080/00222337508065877
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
trans-Stilbene, 1, 1-diphenylethylene, and α-methylstyrene were allowed to react with dibenzylmagnesium to form their oligomers in hexamethylphosphortriamide (HMPA). One and two molecules of stilbene and 1, 1-diphenylethylene were incorporated into the magnesium carbon bond, and the carbanions obtained in HMPA were stable in analogy with the anionic living polymer having alkali cation as the gegenion in eithers. Intense coloration was observed during the reaction between α-methylstyrene and dibenzylmagnesium as well as in the case of stilbene and 1, 1-diphenylethylene. The low molecular weight products which were formed after a long time in the reaction between α-methylstyrene and dibenzylmagnesium were found to have no magnesium-carbon bond. It was considered that the cleavage of the propagating chain occurred gradually after the rapid propagation had proceeded to consume the monomer.
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