Elsevier, Tetrahedron Letters, 8(37), p. 1183-1186
DOI: 10.1016/0040-4039(95)02405-0
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Tetraphenylporphyrins bearing two, four, and six β-ethyl groups have been synthesized by mixed condensation of benzaldehyde with diethylpyrrole and pyrrole. Investigation of all isomers by spectroscopy and X-ray crystallography shows a series of porphyrins with graded degree of nonplanarity depending on number and position of the ethyl substituents.