Sumitomo Chemical Company, Limited

Masayuki Fukushima

Hiroshi Matsumoto

Ryo Yoshida

Eiki Nagano

Ichiki Takemoto

Yuji Funaki

A process for preparing a compound of the formula: ##STR1## in an excellent yield with high purity, which comprises reacting a compound of the formula: ##STR2## with 3,4,5,6-tetrahydrophthalic anhydride in the presence of a catalyst system consisting of a nitrogen-containing base and a lower fatty acid.

Production of tetrahydrophthalimide compound

Various intermediates useful in the production of herbicidal 2-substituted phenyl-4,5,6,7-tetrahydro-2H-indazole compounds are disclosed. These intermediates have the following formulas: ##STR1## wherein X is chlorine or bromine, Z is chlorine or methyl, and A is amino, hydroxyl, or nitro; ##STR2## wherein B is nitro or hydroxy, and X is chlorine or bromine.

2-Substituted phenyl-4,5,6,7-tetrahydro-2H-indazoles

A 2-substituted phenyl-4,5,6,7-tetrahydro-2H-indazole compound of the formula: ##STR1## wherein X is a chlorine atom or a bromine atom, Y is an oxygen atom or an imino group, Z is a chlorine atom or a methyl group and R is a C.sub.2 -C.sub.4 alkyl group, a C.sub.3 -C.sub.4 alkenyl group or a C.sub.3 -C.sub.4 alkynyl group, which is useful as a herbicide.

Herbicidal 2-substituted phenyl-4,5,6,7-tetrahydro-2H-indazoles

A 2-substituted phenyl-4,5,6,7-tetrahydro-2H-indazole compound of the formula: ##STR1## wherein X is a chlorine atom or a bromine atom, Y is an oxygen atom or an imino group, Z is a chlorine atom or a methyl group and R is a C.sub.1 -C.sub.6 alkoxycarbonylmethyl group, a C.sub.3 -C.sub.6 cycloalkoxycarbonylmethyl group or a C.sub.1 -C.sub.4 haloalkoxycarbonylmethyl group, which is useful as a herbicide.

Growing community of inventors

Hyogo, Japan

Masayuki Fukushima