Process for the preparation of 2-chlorobenzothiazoles or 2-chlorobenzoxazoles

摘要

The title compounds of the formula <IMAGE> in which R<1> and R<2> independently of one another are hydrogen, straight-chain or branched C1-C4-alkyl, straight-chain or branched C1-C4-alkoxy, nitro, fluorine, chlorine, bromine, SO2Cl, cyano or SO2-C1-C4-alkyl, and X is sulphur or oxygen, can be prepared from the associated bis(benzothiazole) disulphides or bis(benzoxazole) disulphides without use of organic solvents and without use of catalytically active substances if the disulphides are reacted with elemental chlorine at an initial temperature between 150 and 285 DEG C, where the disulphur dichloride additionally formed can be employed even before beginning the addition of chlorine, in an amount of 5-200% by weight, based on the amount of disulphide to be reacted.