Vinyl Chloride → 4-(2-chloroethenyl)-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

2.0 g of 4-bromo-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazole together with 18.5 mg of palladium acetate, 73.2 mg of di(tert-butyl)phenylphosphine, 60.3 mg of tetrabutylammonium bromide, 10 mg of hydroquinone, 1.8 g of dicyclohexylmethylamine and 23 ml of dimethylacetamide are placed in a stainless steel autoclave. 2.6 g of vinyl chloride are condensed into this autoclave at low temperature and the autoclave is subsequently closed. It is subsequently heated at 140° C. for 20 hours. It is then cooled and depressurized and the reaction mixture is dewatered and worked up by extraction. 1.53 g (83% of theory) of 4-(2-chloroethenyl)-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazole are isolated.

Provenance & Evidence