4-[5'-Oxo-1',3'-diphenyl-4'-(p-tolylmethyl)]-1,3-diphenyl-4-(p-tolylmethyl)pyrazol-5-one: Product of a Reductive Dimerization Reaction

The title compound, 2,5,2',5'-tetraphenyl-4,4'-bis(p-tolylmethyl)-[4,4'-bipyrazolyl]-3,3'(2H,2'H)-dione, C₄₆H₃₈N₄O₂, isolated in dl form by a diastereoselective reductive dimerization of 4-arylmethylene-3-phenylpyrazol-5-one, is a dimeric compound with approximate C₂ symmetry. It contains two chiral C atoms having the same configuration and related by the pseudo-twofold axis. The crystal consists of a centrosymmetric crystal packing of both R,R and S,S diastereomers.

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