Bromine → 1-[(4-Bromo-1H-pyrrol-2-yl)methylidene]pyrrolidin-1-ium bromide

Participants

Reaction Steps

To a solution of 91.0 g of 1-(pyrrol-2-ylmethylene)pyrrolidmium bromide (0.397 mole) in 1300 ml of absolute chloroform is added dropwise with stirring and ice-cooling 63.4 g of bromine (0.397mole). A solid precipitates during addition. After the reaction mixture has been stirred at room temperature for 64 hours, the solvent is evaporated in vacuo and the residue is recrystallized from 3:1 chloroform-acetonitrile to give as an off-white solid 1-(4-bromopyrrole-2-ylmethylene)pyrrolidinium bromide; m.p. 226°-228° C.

Provenance & Evidence