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Lanthanoid alkoxide as a novel initiator for the synthesis of polyester via polymerization of ketenes

✍ Scribed by Hiroshi Sugimoto; Masao Kanai; Shohei Inoue

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 450 KB
Volume: 199
Category: Article
ISSN: 1022-1352
DOI: 10.1002/(sici)1521-3935(19980801)199:8<1651::aid-macp1651>3.0.co;2-5

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✦ Synopsis

The present study demonstrates the polymerization of ketenes by using lanthanoid isopropoxide as a novel initiator to produce a polyester of high molecular weight. This is the first example of an efficient room-temperature polymerization of ketenes. As a result of model reactions, it is indicated that the /I-lactone type ketene cyclic dimer does not participate in the polyester formation from the ketene monomer with lanthanoid alkoxides, and that the alternating repetition of 0-acylation of the La ketone-enolate and C-acylation of the La ester-enolate is the most likely mechanism.

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