Patent ID: 6573397
Filing Date: 2003-06-03
Classification: C07C

Abstract:
A process for producing 3,4-dihydroxybenzonitrile comprising the steps of:chlorinating 3,4-methylenedioxybenzonitrile with at least one member selected from the group consisting of sulfuryl chloride and mixtures of molecular chlorine with a chlorination-promoter consisting of at least one member selected from phosphorus trichloride, phosphorus pentachloride, sulfuryl chloride, thionyl chloride, and nitrosyl chloride, to prepare 2-chloro-benzo[1,3]dioxole-5-carbonitrile, and hydrolyzing 2-chloro-benzo[1,3]dioxole-5-carbonitrile by contacting it with water to produce 3,4-dihydroxybenzonitrile.