This organic chemistry video tutorial provides a basic introduction to the Witting reaction mechanism, Witting Reagent preparation Wittig reaction is an organic chemical reaction wherein an aldehyde or a ketone is reacted with a Wittig Reagent (a triphenyl phosphonium ylide) to yield an alkene along with triphenylphosphine oxide. It is one of the methods to convert aldehyde or ketone into alkene derivatives. The Michael reaction or Michael addition is the nucleophilic addition of a carbanion or another nucleophile to an α,β-unsaturated carbonyl compound. It belongs to the larger class of conjugate additions.