Deuteroporphyrin and cytodeuteroporphyrin β-ketoester derivatives have been prepared by condensation of the appropriate porphyrin acid chloride with ethyl t-butyl sodiomalonate or with the magnesium chelate of t-butyl β-oxopropionate. These porphyrins are enolised, and NMR results indicate that they consist of about 35% of the enol and 65% of the keto form.
A. N. Kozyrev, A. N. Nizhnik and A. F. Mironov, J. Chem. Soc., Perkin Trans. 1, 1990, 1945 DOI: 10.1039/P19900001945
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