Patent ID: 8367849

Claim:
A production method for a sultone derivative of chemical formula 2 described below, comprising: (A) hydrolyzing a sulfonyl halide derivative of chemical formula 1: wherein R 1 to R 9 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, or R 1 and R 5 are bound together and form an alkylene group having 1 to 6 carbon atoms and optionally comprising an oxygen atom or a sulfur atom; and X represents a fluorine atom, a chlorine atom or a bromine atom; or an enantiomer thereof, and (B) reacting said hydrolyzed sulfonyl halide derivative with an oxidizing agent to obtain a corresponding sultone derivative of chemical formula 2: or an enantiomer thereof.