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: <CHEM> <CHEM> wherein n denotes an integer of 1 or 2, R<1> and R<2> represent H, a C1-8 alkyl group or the like and R<3> represents a C1-3 alkyl group.