Polymerization of N‐vinylcarbazole in liquid sulfur dioxide initiated by oxygen

One‐electron transfer initiated polymerization reactions I. Initiation through monomer cation radicals

“…The polymerization of N-vinylcarbazole in liquid sulfur dioxide is greatly accelerated in the presence of oxygen (77). The proposed mechanism of polymerization involves complexation of the monomer with the sulfur dioxide to generate a monomer cation radical and a sulfur dioxide anion radical.…”

“…The originally proposed mechanism involves initiation by the iodine cation. 21z + 13-1+ (76) H+ I I+ + CH,=CH -I-CH,C OR I OR (77) A more recent proposal (86) has suggested that the inactive r-complex (6) is accompanied by an active complex (7). cHzTCH-oR 1 2 CH,=CH-OR 1 I?…”

Cationic polymerization of indene initiated by methyl ethyl peroxide in liquid sulfur dioxide

“…ence of sulfur dioxide (9). This polymerization is greatly accelerated in the presence of oxygen (10). The proposed mechanism of polymerization involves complexation of the monomer with sulfur dioxide to generate a monomer cation radical and a sulfur dioxide anion radical.…”

“…The proposed mechanism of polymerization involves complexation of the monomer with sulfur dioxide to generate a monomer cation radical and a sulfur dioxide anion radical. The sulfur dioxide anion radical is rapidly oxidized by oxygen, permitting the cationic polymerization of monomer by addition to the monomer cation (10).…”

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(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) Yonezawa 992) Reaction of 1, 3-cyclohexadiene (1, 3-CHD) with acrylonitrile (AN) in the presence of ZnCl2 has been investigated.In this system, a cycloaddition (Diels-Alder reaction) and a spontaneous copoly-

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