Abstract: The invention provides a process for the preparation of nitromethylene heterocyclic compounds of general formula ##STR1## wherein R.sup.1 represents a hydrogen atom or a formyl or acetyl group, each moiety R.sup.2 is independently selected from hydrogen atoms and C.sub.1-4 alkyl and benzyl groups, and n is 2 or 3, which process comprises reacting an alkali metal methylnitrodithioacetate with a compound of formulaH.sub.2 N--(CR.sub.2.sup.2).sub.n --OSO.sub.3 H (II)wherein R.sup.2 and n are as defined above, optionally followed by conversion of the resulting compound of Formula I wherein R.sup.1 is hydrogen to the corresponding compound of Formula I wherein R.sup.1 is formyl or acetyl. Certain compounds of Formula I are known insecticidally active compounds.

Abstract: The invention provides 2-nitromethylene hexahydropyrimidines of the general formula: ##STR1## in which R represents a hydrogen atom; a cycloalkyl group optionally substituted by alkyl and/or halogen; or a group of formula --(CO).sub.n (Y).sub.m R.sup.2 in which n is 0 or 1, Y is oxygen or sulphur, m is 0 or 1 and R.sup.2 represents an alkyl, alkenyl or alkynyl group optionally substituted by one or more substituents selected from halogen; alkoxy; haloalkoxy; alkoxyalkoxy; hydroxy; acyloxy; thiol; cycloalkyl optionally substituted by alkyl and/or halogen; and optionally substituted phenyl; and R.sup.1 represents an optionally substituted phenyl group; their preparation and their use as pesticides.

Abstract: A process for preparing insecticidal N-acyl-tetrahydro-2-nitromethylene-2H-1,3-thiazines, intermediates involved therein and certain of the products.

Abstract: A process for preparing insecticidal N-acyl-tetrahydro-2-nitromethylene-2H-1,3-thiazines, intermediates involved therein and certain of the products.

Abstract: A 3-acyl-2-nitromethylene-tetrahydro-2H-1,3-thiazines of the general formula: ##STR1## in which R represents an optionally ring-substituted benzyl group; a cycloalkyl group optionally substituted by halogen and/or alkyl; or an alkyl, alkenyl or alkynyl group of 2 or more carbon atoms optionally substituted by one or more of the same or different substituents selected from halogen, optionally substituted phenyl, phthalimido, alkoxy, haloalkoxy, alkoxyalkoxy, hydroxy, thiol, cycloalkyl optionally substituted by halogen and/or alkyl, and groups of the formula--COR.sup.1, --X.CO.R.sup.1 or --CO.X.R.sup.

Abstract: Insecticidal 2-(nitromethylene)-tetrahydro-2H-1,3-thiazines substituted on the nitrogen atom of the ring by a hydroxy- or formyloxy-substituted alkylsulfonyl moiety.

Abstract: Substituted 2-nitromethylene-tetrahydro-2H-1,3-thiazines of formula: ##STR1## in which n is 0 or 1; m is 0 or 1; X is oxygen or sulphur; and R is alkyl, alkenyl or alkynyl optionally substituted by one or more of the same or different substituents selected from halogen atoms and hydroxy, thiol, acyloxy, acylthio, alkoxy, alkoxyalkoxy, haloalkoxy, and optionally substituted phenyl groups; have useful pesticidal properties.

Abstract: Sulphenyl nitromethane derivatives of formula: ##STR1## in which R.sup.1 represents an alkyl group or a cycloalkyl-alkyl group; and R.sup.2 represents an alkyl group optionally substituted by one or more halogen atoms or an aryl group optionally substituted by one or more halogen atoms or by one or more alkyl or alkoxy groups, exhibit pesticidal, in particular insecticidal activity. They are prepared by reacting the corresponding nitromethylene carboxylate with a sulphenyl halide R.sup.2 --S--Hal in the presence of a base.

Abstract: 3-formyl-2-nitromethylene-2H-1,3-thiazine, and its use as a pesticide.

Abstract: Insecticidal 2-(nitromethylene)-tetrahydro-2H-1,3-thiazines substituted on the nitrogen atom of the ring by a sulfonyl moiety.