Evidence for rhombohedral boron nitride in cubic boron nitride films grown by ion-assisted deposition

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.