The exo facial selectivity in the hydroboration of 2-, 3- and 4-methylene-5α-androstanes is rationalized in terms of the easier steric access and a hyperconjugative interaction of the alkene with the adjacent axial C–H bonds enhancing the electron density on one face of the alkene.
K. Al-Footy, J. R. Hanson and C. Uyanik, J. Chem. Res. (S), 1999, 304 DOI: 10.1039/A809761E
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