Chapter 7, Problem 7.30P

(a)

Interpretation Introduction

Interpretation:

The reaction sequences that are followed in the formation of the product with the given reactants has to be written.

(b)

Interpretation Introduction

Interpretation:

The reaction sequences that are followed in the formation of the product with the given reactants has to be written.

Concept Introduction:

The reagent ${\text{Na / NH}}_3$ is used for the conversion of Alkynes to trans alkenes.  The reaction mechanism is the sodium forms the radical-anion in the Alkyne and then, a proton is transferred from the ammonia to the radical-anion.  The second atom in the sodium is transferred to form the carbanion.  The carbanion is neutralized by the proton of the ammonia.

(c)

Interpretation Introduction

Interpretation:

The reaction sequences that are followed in the formation of the product with the given reactants has to be written.

(d)

Interpretation Introduction

Interpretation:

The reaction sequences that are followed in the formation of the product with the given reactants has to be written.

(e)

Interpretation Introduction

Interpretation:

The reaction sequences that are followed in the formation of the product with the given reactants has to be written.

Concept Introduction:

The reagent ${\text{(sia)}}_{\text{2}}\text{BH}$ is known as Disimylborane.  It is used for chemo and regioselective hydroboration reactions.  This reagent is more selective for terminal hydroboration.