Nihon Nohyaku Co., Ltd.

Takeshi Katsuhira

Hideo Takaishi

Takashi Furuya

Kenji Tsubata

Makoto Gotoh

Masanori Tohnishi

Akira Seo

Kazuyuki Sakata

Masayuki Morimoto

Tateki Nishida

Hiroki Kodama

Tomokazu Hino

Hiroto Harayama

Yuzo Miura

Hiroshi Yamaguchi

Takashi Ohtsuka

Masahiko Murai

Masanori Tonishi

Yoshiki Oda

Youichi Kawabata

The present invention provides a process for producing 2-halobenzoic acids of the general formula (I), characterized by reacting a benzoic acid of formula (II) with a halogenating agent in the presence of Pd catalyst: (wherein A is &#x2014;OH, &#x2014;OM (M is alkali metal), &#x2014;N(R)R(Rand Rare each H, C&#x2013;Calkyl, optionally substituted phenyl, or the like); R is H, C&#x2013;Calkyl, C&#x2013;Calkylcarbonyl, carboxyl, C&#x2013;Calkoxycarbonyl, optionally substituted phenylcarbonyl, or the like; n is 0 to 4; X is Cl, Br or I, or alternatively (R)n may be present on benzene-constituting carbon atoms adjacent to each other and form a C&#x2013;Calkylene- or C&#x2013;Calkenylene-fused ring).

Process for the preparation of 2-halobenzoic acids

Heterocyclic dicarboxylic acid diamide derivatives, agricultural/horticultural insecticides and method of using the same

Fused-heterocycle dicarboxylic acid diamide derivatives or salts thereof, herbicide and usage thereof

The present invention provides a pyridine-2,3-dicarboxylic acid diamide derivatives represented by the following formula (I) and herbicides containing them as an active ingredient. ##STR1## �wherein R.sub.1 represents one to three substituents such as H, halogen, cyano, nitro, (halo)alkyl, (halo)alkoxy, (halo)alkylthio, (C.sub.3-6)cycloalkyl, alkenyl, alkynyl, substituted phenyl, substituted phenoxy, etc. and R.sub.1 may represent alkylene or alkenylene together with an adjacent carbon atom; R.sub.2 represents H, halogen, cyano, nitro, (halo)alkyl or (halo)alkoxy; R.sub.3 represents H or alkyl; R.sub.4 and R.sub.5 each represent H, (halo)alkyl, cycloalkyl, substituted cycloalkylalkyl, etc.; and n represents an integer of 0 or 1!. The present compounds exhibit excellent effect for controlling paddy field weeds and the like.

Pryidine-2,3-dicarboxylic acid diamide derivatives and herbicides

Growing community of inventors

Kawachinagano, Japan

Takeshi Katsuhira