PYRAZOLIN FORENINGAR MED INSEKTICID VERKAN

摘要

1398196 1-Carbamoyl-#2-pyrazoline derivatives PHILIPS GLOEILAMPENFABRIEKEN NV 6 Feb 1973 [9 Feb 1972] 5832/73 Heading C2C Novel compounds have the Formula I wherein A is a phenyl group optionally carrying 1 or 2 substituents selected from halogen, -CN, C 1-4 alkyl, C 1-4 haloalkyl, cycloalkyl, C 1-4 alkoxy, C 1-4 alkylthio, -NHR, -NRR (each R is individually C 1-4 alkyl) and heterocyclic radicals attached to the phenyl group by a N ring atom and optionally containing a second hetero atom selected from S, O and N, or A is a thienyl or pyridyl group optionally substituted by a halogen atom or a C 1-4 alkyl group; B is a hydrogen atom or a phenyl group optionally carrying 1 to 3 substituents selected from halogen, C 1-4 alkoxy, C 1-4 alkyl, C 1-4 haloalkyl, cycloalkyl, C 1-4 alkylthio, C 1-4 alkylsulphonyl, C 1-4 dioxyalkylene, -NHR, -NRR (each R is individually C 1-4 alkyl) and heterocyclic radicals attached to the phenyl group by a N ring atom and optionally containing a second hetero atom, or B is a furyl, pyrryl, thienyl or pyridyl group optionally substituted by a halogen atom or a C 1-4 alkyl group; R 1 is halogen, C 1-4 alkoxy, C 1-4 alkyl, C 1-4 haloalkyl, cycloalkyl, C 1-4 alkylthio, C 1-4 alkylsulphonyl, -CN, -NO 2 or an amino group substituted by 1 or 2 alkyl groups which together with the common nitrogen atom can form a ring optionally containing a second hetero atom; and n is 0, 1 or 2, with the proviso that when A represents a phenyl group containing 2 substituents these do not occupy the 2,6 positions on the benzene ring and also that (R 1 ) n is not a 2,6- disubstitution. The #2-pyrazolines of Formula I are prepared by reacting a compound of Formula II with a compound of Formula III preferably in the presence of a solvent (e.g. an ether) and a catalyst (e.g. an organic base). Specific examples relate to the preparation of (a) 1 - (3,4 - dichlorophenylcarbamoyl) - 3- phenyl - #2 - pyrazoline and (2) 1 - (4 - chlorophenylcarbamoyl) - 3 - (4 - chlorophenyl) - 5- (4 - chlorophenyl) - #2 - pyrazoline but many more pyrazolines are listed with their physical properties. The compounds of Formula I possess biocidal activity.