Chapter 11, Problem 43CP

Interpretation Introduction

Interpretation:

The structure of compound 2,4,5,6, and 7 has to be provided.

Concept Introduction:

Lindlar reduction: The alkenes or alkynes can be reduced to alkanes with ${\text{H}}_{\text{2}}$ in the presence of metal catalyst $\left(\text{Pd}\right)$. This heterogeneous catalyst that consists of palladium deposited on calcium carbonate which is then poisoned with various forms of lead or Sulphur. The new $\text{C-H σ}$ bonds are formed simultaneously from $\text{H}$ atoms absorbed into the metal surface.

Halogenation: The addition of halogen atoms to a $\text{π-}$ conjunction system. The several unsaturated organic compounds like, alkenes, alkynes and cyclohexenes that has one double bond is halogenated, the resulting molecules is completely saturated or halogenated.

Alcohols is protected by using variety of reaction for example, Alcohols can be protected by treating with THP (Tetrahydropyran) in presence of butyl lithium. Similarly it can be protected by using $\text{TMSCl}$ in presence of base.

Alcohols treated with any metals or base which provides alkoxide.

Hydroboration:

Hydroboration is the addition of a hydrogen-boron bond to the Carbon-Carbon, Carbon-Nitrogen, and Carbon-Oxygen double bonds and Carbon-Carbon triple bonds.

When alkene undergoes hydroboration using alkyl borane and hydrogen peroxide followed by hydrolysis which yields the alcohol. The formation of alcohol is depends on the less hindered carbon of the double bond.