PURPOSE: To obtain a compound useful as a synthetic intermediate for dyes, agricultural chemicals and medicines and developer for heat- and pressure- sensitive recording paper, by reacting a diphenyl carbonate with benzenesulfonyl chloride in the presence of a small amount of a Lewis acid.
CONSTITUTION: A diphenyl carbonate expressed by formula II (R1 and R2 are H, halogen, lower alkyl or phenyl) and a benzenesulfonyl chloride expressed by formula II (R3WR5 are H, halogen, lower alkyl or alkoxy and two of R3WR5 may link to form a ring) are subjected to condensation reaction in the presence of a Lewis acid (e.g. ferric chloride) at -10W+20°C. The Lewis acid is used in an amount of 0.01W10wt.%, preferably 0.5W5wt.% based on the compound expressed by formula I. Hydrochloric acid, etc., are then added to carry out hydrolysis and afford the aimed substance expressed by formula III.
KITANI MASAKATSU
ISHIBASHI TAKASHI
| JPS472921A |
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