Vinyl Ether Cationic Polymerization

Stereoselective cationic polymerization of vinyl ethers by easily and finely tunable titanium complexes prepared from tartrate derived diols.

Vinyl ether cationic polymerization.

In the presence of 2 6 dimethylpyridine as an added base living cationic polymerization of isobutyl vinyl ether was achieved in n hexane at 0 to 40 c with the 1 isobutoxy ethyl acetate. Living cationic copolymerization of amide functional vinyl ethers with isobutyl vinyl ether ibve was achieved using sncl 4 in the presence of ethyl acetate at 0 c. The living cationic polymerization of benzyl vinyl ether bnve was achieved by the ch 3 ch o i bu ococh 3 1 etalcl 2 initiating system in the presence of added bases. The number average molecular weight of the obtained polymers increased in direct proportion to the monomer conversion with relatively low polydispersity and the amide functional monomer units were introduced almost quantitatively.

This article is part of the themed collection. We have recently realized ring expansion cationic polymerization of vinyl ethers by using a hemiacetal ester embedded cyclic initiator that is easily synthesized. Macromolecules 26 1643 1649 1993. Living cationic polymerization of isobutyl vinyl ether by hydrogen chloride lewis acid initiating systems in the presence of salts.

Poly vinyl ether s pves are useful materials of different applications. In conjunction with snbr 4 polymerization of isobutyl vinyl ether ibve smoothly proceeded to give quantitative conversion. In this work we have developed a versatile and highly efficient initiation approach based on thienyl chloride derivatives with readily available starting materials for the living cationic polymerization of vinyl ethers. A photoinitiating system for controlled cationic polymerization of isopropyl vinyl ether ipve was developed using diaryliodonium salts as the photoinitiator.

In situ direct nmr analysis of the growing species. Uv irradiation triggered the degradation of diphenyliodonium iodide which was followed by the controlled polymerization of ipve mediated by long lived propagating species. However gaining photocontrol over chain growth would expand the utility of these methods and facilitate the design of novel complex architectures. Isospecific polymerization and recognition of chiral side chains titanium complexes of α α α α tetraaryl 1 3 dioxolane 4 5 dimethanol taddol derived from naturally abundant tartaric acid were demonstrated to function as highly effective.