Abstract
AbstractSelective ammonolysis of dicyano‐cobalt(III)cobyrinic acid heptamethyl ester (cobester, 2) furnishes the four isomeric hexamethyl ester monoamides 2b, 2d, 2e, 2f carrying the amide function on one of the propionic acid side chains. The isomers were separated by liquid‐liquid chromatography and their structures determined by a comparison of their 13C‐NMR spectra with the spectrum of 2. Amide 2f served as the link between synthetic and authentic vitamin B12 derived material in the total synthesis of vitamin B12.
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