PROCESSO PARA PREPARAR ESTER DE ACIDO TIO E DITIOFOSFORICO E COMPOSICOES PARA COMBATER INSETOS A BASE DESTES

Thio- and dithiophosphoric acid esters of the formula I (I) wherein R1 is methyl or ethyl, R2 is C3-C5-alkyl, R3 is C1-C5-alkyl, C3-C5-alkenyl, C3-C5-alkynyl, benzyl, alpha -phenethyl or beta -phenethyl, R4 is phenyl or a group of the formula -CH2-COOR3 wherein R3 has the meaning given above and X i...

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Zusammenfassung:Thio- and dithiophosphoric acid esters of the formula I (I) wherein R1 is methyl or ethyl, R2 is C3-C5-alkyl, R3 is C1-C5-alkyl, C3-C5-alkenyl, C3-C5-alkynyl, benzyl, alpha -phenethyl or beta -phenethyl, R4 is phenyl or a group of the formula -CH2-COOR3 wherein R3 has the meaning given above and X is oxygen or sulphur are pesticidal in particular acaridal or insecticidal agents.