Method of producing thiono- or dithio-phosphonic acid esters
Abstract
Abstract A MONO- OR DITHIO-PHOSPHONIC ACID ESTER SUCH AS, E.G., O-ETHYYL-S-PHENYL ETHYLPHOSPHONODITHIOATE, IS PREPARED BY ISOMERIZATION OF A TRALKYL PHOSPHITE IN PRESENCE OF AN IODINE CONTAINING CATALYST AT 185*C. AN PRESURES BETWEEN ABOUT 12 AND ABOUT 30 P.S.G. THE CORRESPONDING DIALKYL ALKYL PHOSPHONATE IS REACTED WITH PHOSGENE AT A TEMPERTURE BETWEEN ABOUT 45* AND ABOUT 55*C. AND A PRESSURE BETWEEN ABOUT 0 FAND ABOUT 80 P.S.I.G. THE DIALKYL PHOSPHONO CHLORIDATE FORMED IS THEN REACTED WITH A METAL PHENOLATE AT ABOUT 15*C. WITH A PH CONTROLLED AT ABOUT 12.5 FINALLY THE PHOSPHONIC ACID ESTER IS REACTED WITH PHOSPHOROUS PENTASULFIDE IN TEH PRESENCE OF A PROMOTER BETWEEN ABOUT 90* AND 130*C. THE REACTION OF THE DIALKYL ALKYL PHOSPHONATE WITH PHOSGENE IS CARRIED OUT WITH A PROMOTER IF ELEVATED PRESSURES ARE NOT USED. WASHING OF THE DIALKYL PHOSPHONO CHLORIDATE TO REMOVE AND NUCLEOPHILIC MATERIALS PREVENTS UNWANTED SID REACTIONS FROM OCCURING.
Inventors
- 👤 Harold M Pitt
- 👤 Raymond A Simone
Bibliographic Details
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