Sumitomo Chemical Company, Limited

Tomohiko Gotou

Yuzuru Sanemitsu

Yoshitomo Tohyama

Kazuaki Sasaki

Ichiro Komoto

A process for producing an imidazo[1,2-b]pyridazine compound represented by the formula (2): wherein R, Rand Rare the same or different and each represents a hydrogen atom, a halogen atom, an alkyl group which may be substituted with a halogen atom or atoms, an alkenyl group which may be substituted with a halogen atom or atoms, or an alkoxy group which may be substituted with a halogen atom or atoms, which comprises reacting a 2,3-dihydropyridazine compound represented by the formula (1): wherein R, Rand Rare the same meanings as defined above, with a phosphorus oxyhalide in the presence of an organic base which is in an amount of 0.5 mole or more relative to 1 mole of the 2,3-dihydropyridazine compound and 1 mole or less relative to 1 mole of the phosphorus oxyhalide.

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Minoo, Japan

Tomohiko Gotou