Sulfur ylides, like the phosphorus ylides of Chapter 21, are useful intermediates in
Chapter 26, Problem 26.33(choose chapter or problem)
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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