Patent ID: 7078559

Claim:
A method of producing an acetate derivative represented by formula (II), comprising demonocarboxylating a dimalonate represented by formula (I) by reacting the dimalonate represented by formula (I) with water to obtain the acetate derivative (II), wherein said water is supplied to a reaction vessel for said demonocarboxylating while the concentration of water in a demonocarboxylating reaction solution in a said reaction vessel is controlled to 0.4% by weight or less: wherein n denotes an integer of 1 or 2, R 1 and R 2 represent a hydrogen atom or a straight-chain or branched alkyl group having 1 to 8 carbon atoms or may be combined with each other to form a cyclopentane ring or a cyclohexane ring and R 3 represents a straight-chain or branched alkyl group having 1 to 3 carbon atoms, provided that the two R 3 s may be same or different from each other, and wherein said demonocarboxtlating is at a reaction temperature of at least 150° C.