Mitsui Chemicals, Inc.

Tomotaka Miyashita

Hiroyuki Katsuta

Toshio Kitashima

Hisato Kamekawa

Disclosed is an improved process for producing nitroguanidine derivatives represented by the formula (3), which has an insecticidal activity, or a salt thereof, wherein the substituents are defined herein, in which nitroisourea derivatives represented by the following general formula (1) or a salt thereof wherein the substituents are defined herein, and compounds represented by the following general formula (2) or a salt thereof, wherein the substituents are defined herein, are reacted in the presence of a base in an aqueous solution wherein an inorganic salt is dissolved at not less than 50% of its saturated solubility.

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Kawasaki, Japan

Tomotaka Miyashita