Our stepwise porphin synthesis has been used for the preparation of three porphins, including deuterioporphyrin IX dimethyl ester, containing one or two unsubstituted β-positions, and three β-vinylporphins, including pemptoporphyrin dimethyl ester and spirographis porphyrin dimethyl ester. The vinyl substituents have been introduced through β-dimethylaminoethyl groups by Hofmann degradations.
P. Bamfield, R. Grigg, A. W. Johnson and R. W. Kenyon, J. Chem. Soc. C, 1968, 1259 DOI: 10.1039/J39680001259
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