PROCESSO PARA A PREPARACAO DE ESTERES DO ACIDO TIOFOSFORICO

A process for the preparation of a compound of the formula in which R is alkyl, X is oxygen or sulphur and R' is hydrogen or alkyl, comprising reacting a thiophosphate of the formula in which M is a cation other than NH4(+), with an ethylmercapto compound of the formula in which Y is a fugitive...

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Bibliographische Detailangaben
Hauptverfasser:	FEYEN P, SCHMIDT F
Format:	Patent
Sprache:	por
Schlagworte:	ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMISTRY FISHING FORESTRY HUMAN NECESSITIES HUNTING METALLURGY ORGANIC CHEMISTRY PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF TRAPPING
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Beschreibung
Zusammenfassung:	A process for the preparation of a compound of the formula in which R is alkyl, X is oxygen or sulphur and R' is hydrogen or alkyl, comprising reacting a thiophosphate of the formula in which M is a cation other than NH4(+), with an ethylmercapto compound of the formula in which Y is a fugitive group, in a polar reaction medium at a temperature between about 30 DEG and 80 DEG C. and at a pH between about 2 and 9. Advantageously X is oxygen and the thiophosphate is produced by reaction of a dialkyl phosphite of the formula with sulphur in the presence of an organic base in an organic solvent and subsequent extraction with aqueous MOH solution. Also Y is advantageously chlorine and the ethylmercapto compound is prepared by heating the corresponding alcohol to about 40 DEG -100 DEG C. and passing hydrogen chloride gas into the pre-warmed alcohol, the reaction solution being used directly without working up.