Abstract
After a short historical review of ylid chemistry, questions concerning the structure and the Stevens and Sommelet rearrangements of nitrogen ylids are discussed. Phosphorus ylids are described in more detail, and in particular the mechanism of their reaction with carbonyl compounds. Some specific examples from natural products syntheses are used to illustrate this carbonyl-olefination reaction. The account is concluded with a description of sulphonium ylids and their characteristic behaviour towards aldehydes and ketones.
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