Chapter 7, Problem 7.7P

Interpretation Introduction

Interpretation:

Curved arrow notation to show the proton transfer steps that take place between ${\text{LiAlH}}_{\text{4}}{\text{ and H}}_{\text{2}}\text{O}$ is to be drawn, and the product formed in the reaction is to be predicted. Also, curved arrow notations to show the proton transfer between ${\text{NaBH}}_{\text{4}}$ and phenol is to be drawn.

Concept introduction:

The curved arrow notation for an elementary step reflects the flow of electrons from an electron-rich site to an electron-poor site.

Lithium aluminum hydride (${\text{LiAlH}}_{\text{4}}$) consists of ${\text{Li}}^{\text{+}}$ and ${\text{AlH}}_{\text{4}}^{\text{-}}$ ions. The reactive species is ${\text{AlH}}_{\text{4}}^{\text{-}}$ which transfer the hydride ion (${\text{H}}^{\text{-}}$).

Sodium borohydride (${\text{NaBH}}_{\text{4}}$) consists of ${\text{Na}}^{\text{+}}$ and ${\text{BH}}_{\text{4}}^{\text{-}}$ ions. The reactive species is ${\text{BH}}_{\text{4}}^{\text{-}}$ which transfers the hydride ion (${\text{H}}^{\text{-}}$).