Thermal isomerisation of steroid boranes derived from cholest-2-ene and -5-ene results in the migration of the boron atom from one ring to another with the establishment of an equilibrium. The most favoured position is the 3β(equatorial); next is the 2α-position (equatorial). The results support Brown's hypothesis of steric control and of the establishments of a thermodynamic equilibrium during isomerization.
J. E. Herz and L. A. Márquez, J. Chem. Soc. C, 1969, 2243 DOI: 10.1039/J39690002243
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