BH₃(THF) is also commercially available as THF solutions. Its shelf life is less than BMS.

In terms of synthetic results, diborane or the more conveniently handle BMS and borane-THF are equivalent.

Hydroboration of alkenes

The stoichiometry and idealized regiochemistry of hydroboration of terminal alkenes follows:
:In reality, each hydroboration step follows 1,2-addition but ca. 4% gives the 2,1 addition (affording the B(CH(CH3)R isomer).In extreme cases, such as risubstituted alkenes, hydroboration affords.

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