Structures of N-benzyl- and N-cyclohexylmethyl-(4-diphenylacetoxy) piperidines

The crystal structures of N-benzyl-4-(diphenylacetoxy)piperidine methobromide (I) and hydrobromide (II) and N-(cyclohexylmethyl)-4-(diphenylacetoxy)piperidine hydrochloride (III) were determined. Cations of (I) [N-benzyl-4-(diphenylacetoxy)-N-methylpiperidinium] and (II) [N-benzyl-4-(diphenylacetoxy)piperidinium] adopt similar U-shaped conformations with the benzene ring of the benzyl moiety approaching the diphenylacetate group, while the cation of (III) [N-cyclohexylmethyl-4-(diphenylacetoxy)piperidinium] adopts a completely different (stretched) conformation