Hydrochloric Acid → 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-one dihydrochloride

Participants

Reaction Steps

To a stirred solution of 76 parts of 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one in 280 parts of ethanol are added 120 parts of a hydrochloric acid solution and 250 parts of water. The whole is stirred for 30 minutes at room temperature. Upon cooling in an ice-bath, the product is precipitated. It is filtered off, washed with 2-propanone and with 2,2'-oxybispropane, and dried, yielding 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-one dihydrochloride.hydrate; mp. 237.5° C.

Provenance & Evidence