Study Notes On Wittig Reaction (Chemical Science) - Download PDF!

By Astha Singh|Updated : April 5th, 2022

Are you an Aspirant of CSIR-NET and looking for some short and reliable notes for Chemical Sciences to strong your base for preparations? We have got you covered!

Candidates preparing for their CSIR NET exam can really make their preparation journey easier with the help of some reliable study notes that cover the topics in the most simple way. We at Byju's Exam Prep have come up with the idea of providing short notes on Wittig Reaction, which comes under the Organic Chemistry section of the Chemical Science syllabus. 

The short note on Wittig Reaction is developed by our experienced subject-matter experts to provide you with the most standard and authentic set of study materials to be focused upon. The students need the best resources for their preparation to clear the CSIR NET examination, Here are the most reliable study Notes to make the topics easier for you and also help you to save your time for the preparations for the upcoming CSIR-NET 2022 exam.

Study Notes On Wittig Reaction


This reaction is named after scientist Georg Wittig. It is also known as Wittig Olefination. It is a type of coupling reaction where an aldehyde or ketone reacts with triphenylphosphonium ylide to yield alkene and triphenylphosphine oxide.

Solvents used in this reaction are typically THF or diethyl ether.

Phosphonium ion generates ylide. The geometry of the resulting alkene depends upon the reactivity of ylide. If ‘R’ is an electron-withdrawing group, then the ylide is STABILISED and it is not as reactive as when ‘R’ is an alkyl group. 

The stabilized ylide predominantly gives (E)-alkene whereas, the non-stabilized ylide gives (Z)-alkene.


Reaction Mechanism- 

A four-membered cyclic intermediate (an oxaphosphetane) is formed as a result of [2 + 2] cycloaddition of ylide to the carbonyl group of substrates.

Firstly, a betaine is formed as a zwitterionic intermediate, which in turn leads to the formation of oxaphosphetane. 

Betaines may be stabilized by lithium salts which leads to side products; suitable bases in the Wittig reaction are NaOH, NaOMe, and NEt3.

Step 1: Attack of ylide Carbon on the carbonyl







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