PROCESS FOR PREPARING DIAZONAPHTHOQUINONESULFONYL CHLORIDE USING DIPHOSGENE AND TRIPHOSGENE

摘要

PROBLEM TO BE SOLVED: To provide a safe process for preparing a diazonaphthoquinonesulfonyl chloride which is a useful intermediate in electronic and dyestuff industries.;SOLUTION: The process for preparing the diazonaphthoquinonesulfonyl chloride represented by formulae 1 to 3 using diphosgene or triphosgene is carried out as follows. Sodium diazonaphthoquinonesulfonate is reacted with an organic base in a molar ratio within the range of (1:1.5) to (1:2.5) in the presence of the diphosgene or triphosgene in a molar ratio of the sodium diazonaphthoquinonesulfonate/diphosgene or triphosgene within the range of (1:1) to (1:1.5) in an organic solvent at a temperature within the range of -50 to 5°C for a period within the range of 40-90 min and the temperature is subsequently increased to 20-25°C. The solvent and base are then removed from the relational mixture under a vacuum to provide a yellow powder product. The desired product is reprecipitated in ice water.;COPYRIGHT: (C)2004,JPO