Vinyl Ether Anion

Silyl enol ethers were added to the cationic polymerization of isobutyl vinyl.

Vinyl ether anion.

Cyclohexyl vinyl ether 98. 1 4 cyclohexanedimethanol vinyl ether mixture of cis and trans 85 technical grade. C 8 h 14 o 3. Previous approaches toward stereoselective vinyl ether polymerizations have exclusively relied on chain end control to dictate facial addition to the propagating oxocarbenium ion which has provided access to isotactic pves in specific cases but is not general to alkyl vinyl ether monomers as a class 13 19.

Etoch ch 2 buli etoc li ch 2 buh toxicity. The photoinitiating system comprises free radical photoinitiators such as 2 2 dimethoxy 2 phenyl acetophenone dmpa benzophenone or thioxanthone together with an onium salt such as diphenyliodonium chloride and zinc bromide. Skotheim original assignee moltech corporation priority date the priority date is an assumption and is not a legal conclusion. This oxidation is followed by mesolytic cleavage of the resulting radical cation species which leads to the generation of a reactive cation this species initiates the polymerization of the vinyl ether monomer and a dithiocarbamate radical that is likely in equilibrium with the corresponding thiuram disulfide dimer.

Vinyl ether oligomers with reactive end groups were prepared by alkylation of silyl enol ethers during propagation. Deprotonation with butyl lithium gives the acetyl anion equivalent. Proposed that important factors in controlling stereochemistry of chain growth in alkyl vinyl ether polymerization are the degree of association of growing cation and its counter anion and the bulkiness of the counter anion. Ether method vinyl polyether cf prior art date 1998 06 08 application number pct us1999 012086 other languages french fr inventor boris a.

A new photoinitiating system for living cationic polymerization of vinyl ethers is reported. Di ethylene glycol divinyl ether 99. The steric repulsion of bulky substituents of terminal and penultimate monomer units could be. C 8 h 14 o pricing.

C 6 h 12 o 3. In the current approach visible light irradiation of dimanganese decacarbonyl mn 2 co 10 in the presence of an alkyl bromide results in the formation of carbon centered radicals the photochemically generated radicals were then oxidized by diphenyliodonium ions to the corresponding cations. C 10 h 18 o 2. A new photoinitiating system for living cationic polymerization of vinyl ethers such as isobutyl vinyl ether ibve has been reported.

Di ethylene glycol vinyl ether 98.