反应详情

8.5 g (0.05 mol) of 1,1-dicyano-2,2-bis(methylthio)-ethylene and 9.5 g (0.06 mol) of 3-trifluoromethylbenzyl-hydrazine (compare DE-OS (German Published Specification) No. 2,230,675) are stirred in 100 ml of ethanol at 20° C. for 15 hours. For working up, the solvent is removed in vacuo and the residue is triturated with petroleum ether. Filtration with suction gives 12.4 g (80% of theory) of 5-amino-4-cyano-3-methylthio-1-(3-trifluoromethylbenzyl)-pyrazole of melting point 142° C.

1. customthe solvent is removed in vacuo
2. customthe residue is triturated with petroleum ether
3. filtrationFiltration with suction