Question

Convert Ethyne to But-2-yne.

Answer 1

Conversion of Ethyne to But-2-yne:

a) HC$\equiv$CH + Na $\stackrel{liq.N{H}_3}{\to }$ NaC$\equiv$CNa $\stackrel{2C{H}_{3}I}{\to }$ CH₃C$\equiv$CCH₃



b) HC$\equiv$CH $\stackrel{H_2,nickel}{\to }$ CH₃CH₃ $\stackrel{C{l}_2,sunlight}{\to }$ CH₃CH₂Cl $\stackrel{Na,ether}{\to }$ CH₃CH₂CH₂CH₃ ^{$\stackrel{B{r}_2,sunlight}{\to }$} CH₃CH₂CHBrCH_{3 $\stackrel{AlcoholicKOH}{\to }$} CH₃CH$=$CHCH₃ ​$\stackrel{B{r}_2,CC{l}_4}{\to }$ CH₃CHBrCHBrCH_{3 $\stackrel{2AlcoholicKOH}{\to }$} CH₃C$\equiv$CCH₃