5α-Cholestan-3-one tosylhydrazone reacts with an excess of n-butyl-lithium to give 3β-n-butylcholestane instead of cholest-2-ene, which is obtained by reaction with stoicheiometric amounts of alkyl-lithiums.
J. E. Herz and E. González, J. Chem. Soc. D, 1969, 1395 DOI: 10.1039/C29690001395
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