| 摘要 |
It is an object of the invention to provide a method which makes it possible to manufacture the desired sulfonium salts directly without using a metathesis process and without using acids in large excess amounts. 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 formula: R<1> SO R<2> (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 formula:HMXmYn (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).
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