## Organic Chemistry (8th Edition)

Since the OH is attached to the least substituted carbon, this reaction takes place with hydroboration, instead of oxymercuration-demercuration. Borane adds to the double bond in a single step. Boron adds to the less hindered, less substituted carbon, and hydrogen adds to the more substituted carbon. And then $BH_2$ gets replaced by OH. There will be two products because borane can attack from either top or bottom.