Kanazawa a hashizume r kanaoka s.
Vinyl ether polymerization mechanism.
Living cationic ring opening polymerization.
The isotacticity of the polymer was independent of the catalyst concentration but increased with a decrease in the initial monomer.
Vinyl ethers ch 2 chor r methyl ethyl isobutyl benzyl are very reactive vinyl monomers.
Aqueous cationic polymerizations of vinyl ethers isobutyl vinyl ether ibve 2 chloroethyl vinyl ether ceve and n butyl vinyl ether n bve were performed for the first time by a cumoh b c6f5 3 et2o initiating system in an air atmosphere.
Studied systems are based on i 2 hi and on zinc halides zinc chloride zinc bromide and zinc iodide.
This oxidation is followed by mesolytic cleavage.
When highly reactive cycloaliphatic epoxides are subjected to photoinitiated cationic polymerization in the presence of vinyl ethers the two polymerizations proceed in a sequential fashion with the vinyl ether.
It is prone to polymerization leading to formation of polyvinyl ethers.
This method however is highly sensitive to monomer structure and achieved only 76 m and 64 m in the case of n butyl bve and ethyl vinyl ether eve respectively.
For example the state of the art method uses a phenoxide ligated titanium complex to achieve 92 meso diads m in the polymerization of iso butyl vinyl ether ibve.
The polymerization proceeded in a reproducible manner through the careful design of experimental conditions adding initiator co solvents and.
The alkene portion of the molecule is reactive in many ways.
Our study revealed a complex activation step characterized by one electron oxidation of the cta.
However it is challenging to incorporate these substrates in transition metal catalyzed olefin polymerization due to various side reactions such as cationic.
Polymerization of benzyl vinyl ether was carried out by bf 3 oet 2 and the effects of polymerization conditions on the stereoregularity of the polymer were studied by nmr analysis the polymerization at 78 c in toluene gave a highly isotactic polymer.
Furthermore they are highly attractive monomers for the synthesis of many polymers and copolymers.
124 the fast living cationic polymerization of vinyl ethers with sncl 4 combined with etalcl 2 in the presence of an ester as an.
Methyl vinyl ether can be made by reaction of acetylene and methanol in presence of a base.
Design of benign initiator for living cationic polymerization of vinyl ethers.
In all cases the rate of epoxide ring opening polymerization is accelerated whereas that of the vinyl ether is depressed.
The electron rich nature of vinyl ethers ch2 chor enables their versatile reactivity patterns with transition metal catalysts.
Facile in situ generation of vinyl ether hydrogen halide.
