It is shown that both vinyl groups of haem are formed through the loss of S hydrogen atoms located at β-positions of the propionic acid side chains; the hydrogen atoms at the α-positions of the side chains are not involved in the biosynthesis of haem.
Z. Zaman, M. M. Abboud and M. Akhtar, J. Chem. Soc., Chem. Commun., 1972, 1263 DOI: 10.1039/C39720001263
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