Abstract: The invention describes novel 3-cyano-4-sulfenylated-5-alkoxy-1-arylpyrazoles of general formula(I) ##STR1## wherein typically preferred substituents are: R is C.sub.1 to C.sub.4 alkyl fully substituted by halogen;R.sub.1 is C.sub.1 to C.sub.4 alkyl, C.sub.3 to C.sub.6 alkenyl and alkynyl or aralkyl (each of which may be optionally substituted), dialkylaminocarbonyl or a group --P(.dbd.X)(Oalkyl)(Salkyl) wherein X is oxygen or sulfur;R.sub.2, R.sub.3, R.sub.5 and R.sub.6 are each hydrogen or halogen;R.sub.4 is CF.sub.3, OCF.sub.3, SCF.sub.3, SOCF.sub.3, SO.sub.2 CF.sub.3, OCHF.sub.2, halogen or alkyl; and n is 0, 1 or 2.The invention further relates to intermediates and processes to make the compounds and to compositions thereof and to methods of control of arthopod (especially insect) nematode, helminth, and protozoan pests.

Abstract: The invention describes novel 3-cyano-4-sulfenylated-5-alkoxy-1-arylpyrazoles of general formula (I) ##STR1## wherein typically preferred substituents are: R is C.sub.1 to C.sub.4 alkyl fully substituted by halogen;R.sub.1 is C.sub.1 to C.sub.4 alkyl, C.sub.3 to C.sub.6 alkenyl and alkynyl or aralkyl (each of which may be optionally substituted), dialkylaminocarbonyl or a group --P(=X)(Oalkyl)(Salkyl) wherein X is oxygen or sulfur;R.sub.2, R.sub.3, R.sub.5 and R.sub.6 are each hydrogen or halogen;R.sub.4 is CF.sub.3, OCF.sub.3, SCF.sub.3, SOCF.sub.3, SO.sub.2 CF.sub.3, OCHF.sub.2, halogen or alkyl; and n is 0, 1 or 2.The invention further relates to intermediates and processes to make the compounds and to compositions thereof and to methods of control of arthopod (especially insect) nematode, helminth, and protozoan pests.

Abstract: Organophosphorus ester compounds of cyanohydrins of formula (I) ##STR1## wherein R is a hydrogen atom or a methyl group, are useful as insecticides, nematicides or as both. The processes for their preparation, their compositions, and their methods of use are also described.