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Effect of ring size on the cationic ring‐opening polymerization of cyclic sulfites
Author(s) -
Azuma Natsuhiro,
Sanda Fumio,
Takata Toshikazu,
Endo Takeshi
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980901)199:9<1785::aid-macp1785>3.0.co;2-4
Subject(s) - cationic polymerization , polymerization , ring opening polymerization , ring strain , monomer , polymer chemistry , ring (chemistry) , chemistry , ring size , polymer , organic chemistry
The cationic polymerization of five‐ and eight‐membered cyclic sulfites ( 5CS and 8CS ) was examined. The monomer 5CS polymerized in the presence of cationic initiators such as TfOMe, BF 3 · OEt 2 , and TsOMe in bulk to afford a polyether, accompanied by quantitative desulfoxylation. On the other hand, 8CS polymerized without desulfoxylation. Ring strains of 5CS and 8CS were evaluated by molecular orbital (MO) calculations, which confirmed the larger ring‐strain of 8CS compared with 5CS .