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Cationic polymerization of cyclic ketene acetals via zwitterion formation with cyanoallene

✍ Scribed by Shin-Ichi Yamamoto; Fumio Sanda; Takeshi Endo

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 153 KB
Volume: 38
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(20000601)38:11<2075::aid-pola160>3.0.co;2-#

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✦ Synopsis

This article deals with the polymerization of the cyclic ketene acetals (CKAs) 2-methylene-4-phenyl-1,3-dioxolane (2), 2-methylene-4-phenyl-1,3-dioxane (3), 4,7-dimethyl-2-methylene-1,3-dioxepane (4), 2-ethylidene-4-phenyl-1,3-dioxolane (5), 2-phenylmethylene-1,3-dioxolane (6), and 2-isopropylidene-4-phenyl-1,3-dioxolane (7) in the presence of cyanoallene (1). For 2 and 3, the homopolymerization of the CKAs proceeded without ring opening, and the number-average molecular weights of the obtained polymers depended on the feed ratio of 1. However, the reactions of 1 with 4-7 afforded no polymers but did afford spirocyclic 1 : 1 adducts possessing cyclobutane rings.

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