Patent ID: 6376716
Filing Date: 2002-04-23
Classification: C07C

Abstract:
A process for the preparation of an aromatic thiol represented by the formula (I):Ynâ€”Arâ€”(SH)mâ€ƒâ€ƒ(I) wherein Ar is an aromatic hydrocarbon ring; Y represents at least one substituent bonded to a carbon atom constituting the aromatic hydrocarbon ring of Ar, said substituent being selected from the group consisting of halogen, nitro, nitrile, sulfone, sulfamoyl and hydrocarbylsulfonyl groups; m is an integer of 1 or more; and n is an integer of 1 or more, which comprises (a) reacting an aromatic thioether represented by the formula (II): Ynâ€”Arâ€”(SR)mâ€ƒâ€ƒ(II) wherein R represents an aliphatic or aromatic monovalent tertiary hydrocarbyl group represented by the formula (VII): wherein R3, R4 and R5 each represents an alkyl or aryl group, or a monovalent dialkyl, monovalent diaryl or monoalkylmonoaryl secondary hydrocarbyl group, wherein Y, Ar, m and n have the same meanings as defined above; with (A) at least one Lewis acid selected from the group consisting of boron trifluoride, boron trichloride, boron tribromide, aluminum chloride, titanium tetrachloride, ferric chloride, tin tetrachloride, antimony pentoxide and boron trifluoride-diethyl ether complex, in the presence of a solvent, or with at least one protonic acid selected from the group consisting of benzenesulfonic acid, p-toluenesulfonic acid and methanesulfonic acid; and (b) optionally hydrolyzing the obtained reaction product from step (a).