The synthetic route for the preparation of given transformation (mechanism) should be determined. Concept Introduction : Birch Reduction: The conjugated alkynes and benzenes in the presence of sodium metal in liquid ammonia and alkyne produced a non-conjugated diene system. The alkyne involves sodium (Na)/NH 3 . This end up reducing to alkyne to give the trans (E) alkene . Tautomerism: The two isomer of compound which differ only in the position of the protons and electrons. In the carbon skeleton of the compound is unchanged, a reaction which involves simple proton transfer in an intramolecular fashion it is called a tautomerism.

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Chapter 9, Problem 44PP

(a)

Interpretation Introduction

Interpretation:

The synthetic route for the preparation of given transformation (mechanism) should be determined.

Concept Introduction:

Birch Reduction: The conjugated alkynes and benzenes in the presence of sodium metal in liquid ammonia and alkyne produced a non-conjugated diene system.

The alkyne involves sodium (Na)/NH₃. This end up reducing to alkyne to give the trans (E) alkene.

Tautomerism: The two isomer of compound which differ only in the position of the protons and electrons. In the carbon skeleton of the compound is unchanged, a reaction which involves simple proton transfer in an intramolecular fashion it is called a tautomerism.

(b)

Interpretation Introduction

Interpretation:

The synthetic route for the preparation of given transformation (mechanism) should be determined.

Concept Introduction:

Birch Reduction: The conjugated alkynes and benzenes in the presence of sodium metal in liquid ammonia and alkyne produced a non-conjugated diene system.

The alkyne involves sodium (Na)/NH₃. This end up reducing to alkyne to give the trans (E) alkene.

Tautomerism: The two isomer of compound which differ only in the position of the protons and electrons. In the carbon skeleton of the compound is unchanged, a reaction which involves simple proton transfer in an intramolecular fashion it is called a tautomerism.

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