Question

How to convert Ethyne to But-1-yne?

Answer 1

by treating with ethyne again in presence of an acid or proton donor.

Answer 2

Answer :

The preparation of higher alkynes from the lower alkynes :

This reaction involves two steps :

Step 1 : When the terminal ethyne react with the sodamide to give acetylides.

Step 2 : When acetylides react with haloalkane (ethylchloride) to give but-1-yne as higher alkynes.

The given reaction conversion are shown below.