"An important feature of the hydroboration reaction is the regioselectivity observed with unsymmetrical alkenes. Generally, boron attacks positions of highest electron density and lowest steric congestion. This working hypothesis rationalizes the regioselectivity and stereo- selectivity of most hydroboration reactions."
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George S. Zweifel and Michael H. Nantz, Modern Organic Synthesis (2006), Ch. 5 : Functional Group Transformations: The Chemistry of Carbon-Carbon π-Bonds and Related Reactions.
https://en.wikiquote.org/wiki/Hydroboration%E2%80%93oxidation_reaction
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Hydroboration–oxidation reaction
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