SummaryHydrogenation of 4-cholesten-3-one (1) with tritium gas over palladium black in pyridine afforded [P-4,5-SH]-cholestan-3-one (2a).Tritium NMR showed that there was a mixture of tritiated compounds formed, 2a-2c; the latter two containing small amounts of protium substitution. Tritium NMR also indicated that none of the unwanted adiastereomer was formed.
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