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Alkynes – acidity and alkylation of acetylides
Concepts tested here
- acetylide-alkylation
All Questions
2016 1 question
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In the reaction, $H-C\equiv CH \xrightarrow[(ii)\ CH_3CH_2Br]{(i)\ NaNH_2/liq.NH_3} X \xrightarrow[(ii)\ CH_3CH_2Br]{(i)\ NaNH_2/liq.NH_3} Y$, X and Y are
Two successive ethylations of acetylene.
$HC\equiv CH \xrightarrow{NaNH_2/liq.NH_3} HC\equiv C^-Na^+ \xrightarrow{CH_3CH_2Br} CH_3CH_2C\equiv CH$ (X = but-1-yne)
$CH_3CH_2C\equiv CH \xrightarrow{NaNH_2/liq.NH_3} CH_3CH_2C\equiv C^-Na^+ \xrightarrow{CH_3CH_2Br} CH_3CH_2C\equiv CCH_2CH_3$ (Y = hex-3-yne)