Method of producing acetate derivative

摘要

The present invention relates to a method of producing an acetate derivative represented by the formula (II) by demonocarboxylating dimalonate represented by the formula (I), wherein water is supplied while the concentration of water in a demonocarboxylating reaction solution is controlled to 0.4% by weight or less to run demonocarboxylation: wherein n denotes an integer of 1 or 2, R¹ and R² represent H, a C_1-8 alkyl group or the like and R³ represents a C_1-3 alkyl group.