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Regioselective polymerization of vinyl ketene cyclic acetal by means of cationic initiators

โœ Scribed by Hiroyuki Fukuda; Mitsuo Oda; Takeshi Endo


Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
260 KB
Volume
15
Category
Article
ISSN
1022-1336

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Pure 1,2-addition polymers, poly(2-methylene-1,3-dioxolane), 1b, poly(2methylene-1,3-dioxane), 2b, and poly(2-methylene-5,5-dimethyl-1,3-dioxane), 3b, were prepared using the cationic initiators H 2 SO 4 , TiCl 4 , BF 3 , and also Ru(PPh 3 ) 3 Cl 2 . Small ester carbonyl bands in the IR spectra of 1

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Three unsubstituted cyclic ketene acetals (CKAs), 2-methylene-1,3-dioxolane, 1a, 2-methylene-1,3-dioxane, 2a, and 2-methylene-1,3-dioxepane, 3a, undergo exclusive 1,2addition polymerization at low temperatures, and only poly(CKAs) are obtained. At higher temperatures, ring-opening polymerization (RO

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The relationship between the relative reactivities of ten cyclic ketene acetals and their structures was determined via cationic copolymerizations of eight different monomer pairs. Thus, 2-methylene-1,3-dioxolane (1) was copolymerized with 2-methylene-4-methyl-1,3-dioxolane (2), 2-methylene-4,5-dime