Rearrangement of the CH=C-N, N21′, N22′-linkage in the mixed bis(porphyrin) of octaethylporphyrin and meso-tetraphenylporphyrin via the CH-CH-N21′, N22′, N21′ N22′-linkage

The CH=C-N, N-21',N-22'-linked bis(porphyrin) consisting of an N-(vinyl)octaethylporphyrin moiety and a monoprotonated N-21,N-22-vinylidene-bridged meso-tetraphenylporphyrin moiety was rearranged to the CH=C-N,N-21',N-22' linked bis(porphyrin) consisting of an N-(vinyl)-meso-tetraphenylporphyrin moiety and a monoprotonated N-21,N-22-vinylidene-bridged octaethylporphyrin moiety. The CH-CH-N-21,N-22,N-21',N-22'-linked bis(porphyrin) which is a key intermediate of this rearrangement was identified by X-ray crystallography.