Which of the following is formed when three moles of propene react with one mole of `BH_(3)` in tetrahydrofuran `(THF)`, a cyclic ether?

Options

A. `Pr_(3)B`
B. `PrBH_(2)`
C. `Pr_(2)BH`
D. All of these

Answer

A

Explanation

`Pr_(3)B` (tripropylborane) is the final product while `PrBH_(2)` (propylborane) and `Pr_(2)BH` (dipropylborane) are the intermediate products formed in the stepwise reaction.
`CH_(3)CH=CH_(2)overset(BH_(3))rarrCH_(3)CH_(2)CH_(2)BH_(2)overset(CH_(3)CH=CH_(2))rarr(CH_(3)CH_(2)CH_(2))_(2)BHoverset(CH_(3)CH=CH_(2))rarr(CH_(3)CH_(2)CH_(2))_(3)B`