| 摘要 |
Isothiocyanates of the general formula R-N=C=S, wherein R is an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical, which may be substituted by halogen atoms or alkyl, haloalkyl and/or nitro groups, are produced by heating an isocyanide dihalide of the general formula <FORM:0966843/C1/1> wherein X is a halogen atom, with a pentasulphide of the general formula Y2S5, wherein Y is a phosphorus, arsenic or antimony atom, in the presence of an inert solvent. The reactants are expediently added to the inert solvent, the mixture heated, generally at 80 DEG -220 DEG C. and preferably at 100 DEG -150 DEG C., until the pentasulphide is completely dissolved and the isothiocyanate isolated by distillation. Said isothiocyanates have nenatocidal properties (see Division A5). Specification 942,520 is referred to.ALSO:Isothiocyanates of the general formula-R-N=C=S, wherein R is an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical, which may be substituted by halogen atoms or alkyl, haloalkyl and/or nitro groups (see Division C2), have strong nematocidal properties and are especially useful for combating phylopathogenic nematodes. They are used as such or in the form of emulsifiable concentrates, wettable powders, pastes, soluble powders, dusts and granulates which may contain other active ingredients. Specified emulsifiers for the isothiocyanates in said formulations include non-ionic and anionic emulsifiers. Specification 942,520 is referred to. |
