The synthesis of cofacial porphyrin dimers

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Abstract
A cofacial dimeric porphyrin joined by two hydrocarbon chains has been prepared using a bis-porphyrin already linked by a single hydrocarbon chain. When each porphyrin bears an acetylenic group, copper catalyzed coupling followed by catalytic hydrogenation gives a doubly linked cofacial porphyrin. However, a far superior and more flexible route, involving the use of a dimeric biladiene-ac, gives in one step the same cofacial porphyrin. This latter route has been used to prepare dimeric porphyrins with hydrocarbon linkages of varying lengths.

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