Stereospecific polymerization of vinyl alkyl ethers

Abstract

Stereospecific polymerization of vinyl alkyl ether was studied; various kinds of compounds, such as metal oxides, metal halides, metal oxyhalides, metal sulfate complexes and organometallic compounds‐Lewis acid complexes, being used at low temperature or room temperature. The relationship between the structures of catalysts and the stereoregularities of polymers is discussed, and it is found that tetrahedral compounds which have one active edge are especially useful for making the stereoregular polymers at room temperature. Also, the shorter the length of active edge, the more suitable the catalyst is for stereospecific polymerization. On the basis of these experimental results, a mechanism of stereospecific polymerization of vinyl alkyl ether is proposed.

Chiral anion-mediated asymmetric ion pairing chemistry

“…For comparison, the search was also performed with the terms ''counterion'' and ''countercation'' (singular or plural). The oldest article mentioning counteranion seems to be the 1963 article of Nakano and colleagues, 108 counterion and countercation being introduced in 1942 and 1965, respectively. In Fig.…”

Poly(vinyl ethers)

“…Many catalysts have been studied, and those with particular structures give stereoregular polymers at ambient temperatures [83].…”

Some aspects of the polymerization of n‐butyl vinyl ether by chromyl chloride

“…Chromyl chloride, however, has brought about facile polymerization of n-butyl vinyl ether (n-BVE) at ambient temperatures. Nakano et al 5 have made brief mention of chromyl chloride in their search for stereospecific catalyst systems for isobutyl vinyl ether polymerization. The purpose of this work is to elucidate the kinetic and mechanistic characteristics of chromylchloride-initiated polymerization of n-BVE and to examine the effect of conventional additives and some modifiers on the system.…”