2-(3-ethanesulfonylpyridine-2-yl)-5-(trifluoromethanesulfonyl) benzoxazole crystal
A type 2 crystal of 2-(3-ethanesulfonylpyridin-2-yl)-5-(trifluoromethanesulfonyl)benzoxazole having diffraction peaks at 2θ=14.0±0.2°, 14.3±0.2°, 16.5±0.2°, 16.9±0.2°, 17.6±0.2°, 18.8±0.2°, 19.9±0.2°, and 22.3±0.2° in powder X-ray diffraction using Cu-Kα radiation is a stable crystal.
1. A type 2 crystal of 2-(3-ethanesulfonylpyridin-2-yl)-5-(trifluoromethanesulfonyl)benzoxazole, wherein the crystal has diffraction peaks at 2θ=14.0±0.2°, 14.3±0.2°, 16.5±0.2°, 16.9±0.2°, 17.6±0.2°, 18.8±0.2°, 19.9±0.2°, and 22.3±0.2° in powder X-ray diffraction using Cu-Kα radiation.
2. A pesticide formulation comprising the type 2 crystal according to claim 1 as an active ingredient.
3. A method for producing the type 2 crystal according to claim 1 wherein the method comprises dissolving a type 1 crystal of 2-(3-ethanesulfonylpyridin-2-yl)-5-(trifluoromethanesulfonyl)benzoxazole having diffraction peaks at 2θ=13.7±0.2°, 16.2±0.2°, 16.6±0.2°, 17.1±0.2°, 18.8±0.2°, 20.2±0.2°, 21.4±0.2°, and 27.6±0.2° in powder X-ray diffraction using Cu-Kα radiation into 2-propanol, and precipitating the type 2 crystal at a temperature of 65 to 67° C.