Sumitomo Chemical Company, Limited

Sachiko Imazu

Masayoshi Minai

Takaharu Ikeda

Hideyuki Ikehira

Seiichi Kai

An improved process for preparing an optically active 4-hydroxycyclopentenone of the formula: ##STR1## wherein R is a lower alkyl, the symbol  means double bond or triple bond, and the * marked carbon is an asymmetric carbon, and the corresponding racemic 4-hydroxycyclopentenone, which are useful as an intermediate for preparing medicinal or agricultural products, particularly pharmaceutically active prostaglandins, and intermediates for preparing the optically active and/or racemic 4-hydroxycyclopentenone.

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Minoo, Japan

Sachiko Imazu