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What is witting reaction?


Triphenyl phosphonium alkylide (simply phosphorous ylide) is called witting reagent. When carbonyl compound (aldehyde or ketone) is treated with an ylide, olefin (alkene) is formed. This reaction is called witting reaction.

witting reaction


Mechanism of witting reaction


witting reaction mechanism


Question- Answer from witting reaction


Q) Give the reaction and mechanism when 2-hexanone is treated with witting reagent.

When 2-hexanone is treated with witting reagent, 2-methylhex-1-ene is formed. This reaction is called witting reaction. The reaction involved and mechanism is given below.

witting reaction

Mechanism:

Mechanism of witting reaction

Q) Give two different methods for witting synthesis of 2-methyl-1-hexene.

2-methyl-1-hexene can be prepared using witting synthesis by following two methods:

Method-I :

Give two different methods for witting synthesis of 2-methyl-1-hexene.

Method-II :

Q) Write product and mechanism of the reaction:

This reaction is witting reaction. The reaction involved and mechanism is given below:

Mechanism:


References


  • Morrison, R.T. , Boyd, R.N., Organic Chemistry, Sixth edition, Prentice-Hall of India Pvt. Ltd., 2008.
  • March, j., Advanced Organic Chemistry, Fourth edition, Wiley Eastern Ltd. India, 2005.
  • https://chemicalnote.com/category/organic-chemistry/name-reactions/