Patent ID: 7060858

Claim:
A method for manufacturing sulfonium salts with MX m Y n − as anions which is characterized by that an aryl compound (A) in which a hydrogen atom is bonded to at least one of the carbon atoms of the aryl group, and a sulfoxide compound (B) which can be expressed by the following formula (1): (where R 1 and R 2 indicate hydrocarbon groups or heterocyclic groups which may be substituted, and which may be the same or different) are reacted in the presence of a strong acid (C) which can be expressed by the following formula (2) HMX m Y n (2) (where M indicates an element of group IIIa or group Va of the periodic table, X indicates a halogen atom, Y indicates a hydroxyl group, m and n are integers which are such that m+n=4 and n=0 to 3 in cases where M is an element of group IIIa, and m and n are integers which are such that m+n=6 and n=0 to 2 in cases where M is an element of group Va), wherein the reaction is performed in the presence of a dehydrating agent (D).