Process for producing fluorosulfuric acid aromatic-ring esters

A process for producing a fluorosulfuric acid aromatic-ring ester of the general formula [2], comprising reaction of an aromatic-ring hydroxyl compound of the general formula [1] with sulfuryl fluoride (SO2F2) in the presence of a tertiary amine

• Ar—OH [1]
• where Ar represents a phenyl naphthyl or anthryl group that may or may not have any number of and any combination of substituents selected from the group consisting of halogen atoms, lower alkyl groups, lower unsaturated groups, lower haloalkyl groups, C(CF3)2OH group, lower alkoxy groups, lower haloalkoxy groups, lower acyloxy groups, cyano group, lower alkoxycarbonyl groups, lower alkyloxycarbonyl lower alkyl groups, protected carboxyl groups, protected amino groups and protected hydroxyl groups;
• Ar—OSO2F [2]
• where Ar has the same meaning as in the general formula [1],
• wherein the reaction is conducted at a reaction temperature of −40 to +50° C. and at a reaction pressure of 1.0 MPa or lower;
• and
• wherein the tertiary amine is at least one selected from the group consisting of triethylamine, diisopropylethylamine, tri-n-propylamine, tri-n-butylamine, N-methylpiperidine, 1-ethylpiperidine, N,N-dicyclohexylmethylamine and N,N-dicyclohexylethylamine.