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(A) The reaction of an internal alkyne with an alkali metal (like $Na$ or $Li$) in liquid $NH_3$ is known as a dissolving metal reduction or Birch-typ

Vedclass · Accepted Answer

$trans-but-2-ene$

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(A) The reaction of an internal alkyne with an alkali metal (like $Na$ or $Li$) in liquid $NH_3$ is known as a dissolving metal reduction or Birch-type reduction of alkynes.This reaction proceeds via a radical anion intermediate and stereoselectively yields the $trans$-alkene as the major product due to the greater stability of the $trans$-vinyl radical intermediate.Therefore,the reduction of $but-2-yne$ $(CH_3-C \equiv C-CH_3)$ with $Na/liquid \ NH_3$ produces $trans-but-2-ene$.

The major product formed in the following reaction is $CH_3-C \equiv C-CH_3 + Na \xrightarrow{liquid \ NH_3}$

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