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Questions
How will you bring about the following conversion?
Propene to propyne
How will you bring about the following conversion in not more than two steps?
Propene to Propyne
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Solution
\[\begin{array}{cc}
\ce{\underset{Propene}{CH3CH = CH2} ->[Br2/CCl4] CH3 - CH - CH2 ->[NaNH2/liq. NH3, 196 K][-2HBr] \underset{Propyne}{CH3 - C ≡ CH}}\\
|\phantom{.........}|\phantom{........}\\
\ce{\underset{1-2-Dibromopropane}{Br\phantom{......}Br\phantom{.......}}}\\
\end{array}\]
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\[\begin{array}{cc}
\ce{H3C}\phantom{..................................}\\
\backslash\phantom{...........................}\\
\ce{CH - CH2 - CH3}\\
/\phantom{...........................}\\
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\end{array}\]
