Wittig Reaction | 19.7b Organic Chemistry

Chad provides a comprehensive lesson on the Wittig reaction (aka Wittig Alkene Synthesis), which converts ketones and aldehydes to alkenes. The entire Wittig reaction mechanism is covered both for the nucleophilic addition of triphenylphosphine, for the formation of the phosphorus ylide, and for the formation of the alkene. The Wittig reaction is also examined from the standpoint of retrosynthesis, to help you determine which side of the product alkene is more likely derived from a ketone/aldehyde and which side is from the ylide (and ultimately an alkyl halide).

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00:00 Lesson Introduction
00:51 Introduction to the Wittig Reaction
03:57 Wittig Reaction Mechanism
06:47 Formation of Phosphorus Ylides

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