The Wittig reaction takes place between a carbonyl compound and a phosphorus Ylide. Which of the following represents the dipolar contributor to such an ylide? (C6H5) 3P-CHOCH3 (C6H5)3P-CH3 (C6H5)2P-CH2 I I II Li (C6H5)3P-CHCH3 III IV O II only O III only OI&IV O None of the above

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Chapter1: Chemical Foundations
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The Wittig reaction takes place between a carbonyl compound and a
phosphorus Ylide. Which of the following represents the dipolar contributor to
such an ylide?
(C6H5) 3P-CHOCH3 (C6H5)3P-CH3 (C6H5)2P-CH2
I
I
II
Li
(C6H5)3P-CHCH3
III
IV
O II only
O III only
OI&IV
O None of the above
Transcribed Image Text:The Wittig reaction takes place between a carbonyl compound and a phosphorus Ylide. Which of the following represents the dipolar contributor to such an ylide? (C6H5) 3P-CHOCH3 (C6H5)3P-CH3 (C6H5)2P-CH2 I I II Li (C6H5)3P-CHCH3 III IV O II only O III only OI&IV O None of the above
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