The chemistry of pyrrolic compounds. XV. Porphyrins from electronegatively substituted bilenes and biladienes

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Abstract
The preparation is reported of a number of 1,19-dimethyl-1,19-dideoxybilenes-b and 1,19-dimethyl-1,19-dideoxybiladienes-ac which carry electronegative substituents. These linear tetrapyrroles can be cyclized to porphyrins in good yield by means of copper acetate in pyridine solution.