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9-BBN is a selective hydroborating reagent widely used in Organic Chemistry-II for regio- and stereoselective transformations. Structurally known as 9-borabicyclo[3.3.1]nonane, it is generated from borane and 1,5-cyclooctadiene and exists as a stable, crystalline dialkylborane. Its bicyclic framework creates steric hindrance around the boron atom, making the reagent highly selective for terminal alkenes. During hydroboration, 9-BBN adds ________ ________ ________ _____ _______ ___.
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