Optically active ether lactone, optically active polymer thereof

Details Optically active ether lactone, optically active polymer thereof Optically active ether lactone, optically active polymer thereof

1992-04-10

1993-06-22

Nutter, Nathan M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D32108

Patent

active

052217558

ABSTRACT:
An optically active 7-substituted-1,4-dioxepan-5-one derivative represented by the general formula (I): ##STR1## wherein R represents an alkyl group having from 1 to 5 carbon atoms; and * means an asymmetric carbon atom, is disclosed. An optically active polymer represented by formula (II): ##STR2## wherein R and * are as defined above; and n is an integer of 25 or more, obtained by ring opening polymerization of the optically active 7-substituted-1,4-dioxepan-5-one derivative represented by formula (I) is also disclosed. A process for producing the optically active polymer represented by formula (II) is further disclosed, comprising subjecting an optically active 7-substituted-1,4-dioxepan-5-one derivative represented by formula (I) to ring opening polymerization in the presence of at least one catalyst selected from the group consisting of (i) an organotin compound, (ii) an organoaluminum compound and water, and (iii) an organozinc compound and water.

REFERENCES:
patent: 4190720 (1980-02-01), Shalaby
patent: 4470416 (1984-09-01), Kafrawy et al.
patent: 5028667 (1991-07-01), McLain et al.
patent: 5082925 (1992-01-01), Shalaby et al.
patent: 5120802 (1992-06-01), Mares et al.
Macromolecules, vol. 22, 3832-3846 (1989).

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