Sulfur ylides, like the phosphorus ylides of Chapter 21, are useful intermediates in

Chapter 26, Problem 26.33

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Sulfur ylides, like the phosphorus ylides of Chapter 21, are useful intermediates in organic synthesis, as shown in 21.79. Methyl trans-chrysanthemate, an intermediate in the synthesis of the insecticide pyrethrin I (Section 26.4), can be prepared from diene A and a sulfur ylide. Draw a stepwise mechanism for this reaction. O O O OCH3 O O OCH3 + Ph2S + A a sulfur ylide methyl trans-chrysanthemate pyrethrin I

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