GB994616A - New aliphatic isonitriles - Google Patents

Abstract

The invention relates to araliphatic isonitriles having a total of 7-12 carbon atoms of the general formula <FORM:0994616/C2/1> wherein R1-R5, which may be the same or different, are hydrogen or halogen atoms or inorganic or organic radicals, at least one of which is other than a hydrogen atom, and A is an unsubstituted or substituted alkylene bridge, and wherein either or both of the o-positions may be joined with A to form a ring. Compounds claimed per se are p-chlorobenzyl isocyanide, 3,4 - dichlorbenzyl isocyanide, 2 - isocyanotetralin, a ,a - dimethylbenzyl isocyanide, 2,6-dichlorobenzyl isocyanide, 2,4,6 - trichlorobenzyl isocyanide, p-methoxy-benzyl isocyanide. The compounds may be prepared by splitting water from an aralkyl formamide of the general formula <FORM:0994616/C2/2> in which R1-R5 and A have the same meanings as above; or splitting off hydrogen sulphide from an aralkyl thioformamide of the general formula <FORM:0994616/C2/3> in which R1-R5 and A have the same meanings as above; or reacting an aralkyl amine of the general formula <FORM:0994616/C2/4> in which R1-R5 and A have the same meanings as above with dichlorocarbene-forming agent and an alkali metal hydroxide or alcoholate. Examples describe the preparation of each of the above specified compounds. Specified substituents R1-R5 are NO2, CN, OMe, diMe, 3,4-dimethylene, 4 -isopropyl, 2,4,6 - trimethyl, 3-chloro - 4 - methyl, 3 - nitro - 4 - methyl, and 3,4-methylene dioxide.ALSO:Pesticidal compositions comprise as active ingredient an isonitrile of the general formula <FORM:0994616/A5-A6/1> wherein R1-R5 which may be the same or different are hydrogen or halogen atoms or inorganic or organic radicals, at least one of which is other than a hydrogen atom, and A is an unsubstituted or substituted alkylene bridge, and wherein either or both of the o-positions may be joined with A to form a ring, in a mixture with a solid or liquid diluent. Specified active ingredients are 2,6 - dichlorobenzyl isocyanide, 2,3 - dichlorobenzyl isocyanide, 3,4 - dichlorobenzyl isocyanide, parachlorobenzyl isocyanide and 2,4,6 - trichlorobenzyl isocyanide. The compositions may be used in solid or liquid form alone or in admixture with solid or liquid diluents, optionally also in an emulsion, or in combination with other biocidal compounds, such as insecticides, based on phosphorus or urethane compounds.