Question

What is hydroboration oxidation?

Answer 1

It's a hydration reaction that exhibits syn stereochemistry and anti-Markovnikov regiochemistry.

If our substrate is an alkene, we added a hydride and `BH_2` group concertedly. Next, we do an oxidative workup (which is rather complicated), to ultimately replace the `BH_2` with a hydroxyl group.

The enantiomer (or diastereomer) is included because the addition is taking place concertedly on a planar substrate (e.g. alkene).