[G-3H] Ergosterol was prepared from ergosterone by catalytic tritium exchange in aqueous dimethylformamide on a platinum catalyst, followed by enol acetylation and reduction with sodium borohydride. The tritium was found to be distributed 41% at the 1α-, 1β-, 2-, and 4-positions, 29% at the 6- and 7-positions, and 30% in the remaining part of the molecule.
B. Pelc and E. Kodicek, J. Chem. Soc., Perkin Trans. 1, 1972, 1915 DOI: 10.1039/P19720001915
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