what is a wittig reaction
The Wittig reaction or Wittig olefination is a chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide (often called a Wittig reagent) to give an alkene and triphenylphosphine oxide.he steric bulk of the ylide 1 influences the stereochemical outcome of nucleophilic addition to give a predominance of the betaine 3 (c.f. BuergiâBÃ¼rgi dunitz). Angle note that for betaine 3 Both r 1 And r 2 as well PPh3+ pph3 Andâ o are positioned anti to one. another