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प्रश्न
How will you bring about the following conversion?
Ethanol to but-1-yne
How the following conversion can be carried out?
Ethanol to but-1-yne
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उत्तर १
\[\ce{CH3CH2OH ->[SOCl2, pyridine][-SO2, -HCl] \underset{chloroethane (A)}{CH3CH2 - Cl}}\]
\[\ce{HC ≡ CH + NaNH2 ->[liquid NH3,196 K] \underset{sodium acetylide (B)}{HC ≡ C^-Na^+}}\]
\[\ce{A + B -> \underset{but-1-yne}{CH3CH2-C} ≡ CH + NaCl}\]
उत्तर २
\[\ce{2CH3CH2OH + SOCl2 -> 2CH3CH2Cl + SO2\uparrow + HCl\uparrow}\]
\[\begin{array}{cc}
\ce{CH3CH2Cl ->[alc{.} KOH/\Delta] CH2 = CH2 ->[Br2/CCl4]CH2 - CH2 ->[alc{.} KOH/\Delta] HC ≡ CH ->[NaNH2][liq{.} NH3, 196 K] HC ≡ \overset{\ominus}{C}\overset{\oplus}{N}a}\\
|\phantom{...........}|\phantom{.....}\\
\ce{Br}\phantom{........}\ce{Br}\phantom{....}\\
\end{array}\]
\[\ce{CH3 - CH2 - Cl + N\overset{+}{a}\overset{\oplus}{C} ≡ CH -> \underset{But-1-yne}{CH3 - CH2 - C ≡ CH}}\]
उत्तर ३
\[\ce{\underset{Ethanol}{CH3 - CH2 - OH} ->[HBr] CH3 - CH2 - Br ->[HC ≡ C- Na+] \underset{But-1-yne}{CH3 - CH2 ≡ CH}}\]
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\[\begin{array}{cc}
\ce{H3C}\phantom{..................................}\\
\backslash\phantom{...........................}\\
\ce{CH - CH2 - CH3}\\
/\phantom{...........................}\\
\ce{H3C}\phantom{...................................}
\end{array}\]
