Process for preparation of thiophosphoryl chloride and acephate
AssigneeUpl Ltd
InventorsRajju Devidas Shroff, Vic Prasad, Amul Manubhai Desai, Gopalrao Atul Wankhade, Lilaram Kamal Kataria, Raj Kumar Tiwari, Raj Kumar Arora
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Abstract
The present invention discloses an improved process for preparation of acephate and intermediates thereof. More particularly, the present invention relates to a process for preparation of thiophosphoryl chloride useful for commercial production of pesticides and pharmaceutically active compounds.
Claims19
A process for preparing of thiophosphoryl chloride comprising reacting phosphorus trichloride with sulfur, in thiophosphoryl chloride, in the presence a base, wherein said reacting is carried out within a period of less than 60 minutes and said process is recycled for 5 to 7 cycles.
A process for preparing acephate comprising
- a) preparing thiophosphoryl chloride, and
- b) converting the thiophosphoryl chloride to acephate,
- wherein said step a) comprises treating phosphorus trichloride, thiophosphoryl chloride and sulfur in the presence of a tributyl amine catalyst to obtain the thiophosphoryl chloride for a period of less than 60 minutes.
Dependencies are inferred from the claim text.