Crystal of tefluthrin, preparation method therefor and use thereof
AssigneeRotam Agrochem International Company Limited
InventorJames Timothy Bristow
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Abstract
The present invention belongs to the technical field of fine chemicals and relates to a new crystalline form of tefluthrin, a preparation method therefor and the use thereof. The preparation method specifically comprises: taking an amorphous tefluthrin or a solid tefluthrin other than the tefluthrin as described in the present invention as a raw material, firstly preparing the raw material into an amorphous substance at room temperature, and then allowing the amorphous substance to cool to 5° C. to −24° C. to obtain a white or light yellow solid, i.e., a new crystalline form of tefluthrin.
Claims12
A crystalline form II of 2,3,5,6-tetrafluoro-4-methylbenzyl-(1RS,3RS)-3-[(Z)-2-chloro-3,3,3-trifluoroprop-1-enyl]-2,2-dimethylcyclopropane carboxylate (tefluthrin), wherein an X-ray powder diffraction pattern recorded by using Cu-Ka radiation at 25° C. of the crystalline form II shows at least 3 of the following reflections at 20 values in any combination:
- 2θ=5.35±0.2° (1)
- 2θ=10.72±0.2° (2)
- 2θ=10.98±0.2° (3)
- 2θ=12.52±0.2° (4)
- 2θ=14.41±0.2° (5)
- 2θ=18.52±0.2° (6)
- 2θ=20.00±0.2° (7)
- 2θ=21.19±0.2° (8)
- 2θ=21.57±0.2° (9)
- 2θ=22.13±0.2° (10)
- 2θ=23.13±0.2° (11)
- 2θ=25.89±0.2° (12)
- 2θ=26.19±0.2° (13)
- 2θ=27.14±0.2° (14)
- 2θ=28.10±0.2° (15)
- 2θ=31.13±0.2° (16)
- 2θ=32.61±0.2° (17)
- 2θ=34.07±0.2° (18)
- 2θ=38.26±0.2° (19).
Dependencies are inferred from the claim text.