Syntheses of pemptoporphyrin, isopemptoporphyrin, and protoporphyrin IX dimethyl esters

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Abstract
Syntheses of pemptoporphyrin, isopemptoporphyrin, and protoporphyrin IX dimethyl esters by cyclisation of the corresponding 1-bromo-1,19-dideoxy-19-methyl-biladiene-ac dihydrobromides, with use of the 2-(methoxycarbonylamino)ethyl groups as precursors of the peripheral vinyl substituents, are described.