1,3-Dichloro-5,5-dimethylhydantoin → HCID 178481948, compound

Participants

Reaction Conditions

Reaction Steps

1907 g (11.48 mol) of 5-trifluoromethyl-3-hydroxy-1-methylpyrazole was stirred with 8 kg of ether and cooled to 0° C. 1222 g (6.2 mol) of 1,3-dichloro-5,5-dimethylhydantoin was added in three equal portions and the mixture was allowed to cool to 0° C. after each addition. The mixture was stirred for 4 hours, washed with water, brine and water. All washes were extracted with ether and the combined ether solutions were dried with MgSO4 filtered, evaporated on a rotary evaporator and recrystallized from methylcyclohexane to give 2131 g of a tan solid, m.p. 136°-140° C.

Provenance & Evidence