| 摘要 |
The object of the present invention is to provide a novel method for effectively producing a cyclic lactic acid oligomer, and a cyclic lactic acid oligomer produced by the method. According to the present invention, there is provided a method for producing a cyclic lactic acid oligomer represented by the following formula (1):wherein m represents an integer of 1 to 30,wherein lactides are polymerized in the presence of an alkali metal compound represented by the following formula (2):wherein R represents an aliphatic group, aromatic group, -Si(R<10>)(R<11>)(R<12>), -CH(R<20>)CONR<21>R<22 >or -CH(R<30>)COOR<31>, wherein each of R<10>, R<11 >and R<12 >independently represents an aliphatic or aromatic group, R<20 >represents an aliphatic group, each of R<21 >and R<22 >independently represents a hydrogen atom, aliphatic group or aromatic group, R<30 >represents an aliphatic group, and R<31 >represents a hydrogen atom, aliphatic group or aromatic group;Y represents -O-, -S- or -NR<40>-, wherein R<40 >represents a hydrogen atom, aliphatic group or aromatic group; andMe represents an alkali metal; and,a cyclic lactic acid oligomer produced by the above production method.
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