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Punjab Medical Punjab - MET Solved Paper-2011

  • question_answer
    The reaction,\[{{({{C}_{6}}{{H}_{5}})}_{2}}C=O+C{{H}_{2}}=P{{({{C}_{6}}{{H}_{5}})}_{3}}\xrightarrow[ether]{Dry}\]\[{{({{C}_{6}}{{H}_{5}})}_{2}}C=C{{H}_{2}}+{{({{C}_{6}}{{H}_{5}})}_{3}}PO\], is called

    A)  Wittig reaction

    B)  Claisen reaction

    C)  Benzoin condensation

    D)  Perkins reaction

    Correct Answer: A

    Solution :

    The reaction of carbonyl compound with phosphorus yield to give an alkene, is called Wittig reaction. \[{{({{C}_{6}}{{H}_{5}})}_{2}}C=O+\underset{phosphorus\,\,ylide}{\mathop{C{{H}_{2}}=P{{({{C}_{6}}{{H}_{5}})}_{3}}}}\,\]\[\xrightarrow{Dry\,\,ether}{{({{C}_{6}}{{H}_{5}})}_{2}}C=C{{H}_{2}}+O=P{{({{C}_{6}}{{H}_{5}})}_{3}}\]


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