Importance

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Abstract

Disclosed is a low cost, efficient method for production of a salt composed of an arylsulfonium and a fluorinated alkylfluorophosphate which method does not required a large excess amount of acid. The method comprises reacting an aryl compound Ar—H and with a compound represented by the formula (I),—, —NH—, —NR′—, —CO—, —COO—, —CONH—, an alkylene group having 1 to 3 carbon atoms or a phenylene group to form a ring structure which may be substituted, wherein R′ denotes a C1-5 alkyl group or a C6-10 aryl group; in the presence of an acid represented by the formula (2), wherein Rf denotes an alkyl group 80% or more of whose hydrogen atoms are substituted by fluorine atoms, “a” is an integer of 1 to 5; and a dehydrating agent to produce the salt of sulfonium represented by the formula (3).

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First Claim