Study Notes on Patterno Buchi Reaction (Chemical Science) - Download PDF!

By Astha Singh|Updated : August 19th, 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 make their preparation journey easier with the help of reliable study notes that cover the topics in the most simple way. BYJU'S Exam Prep has come up with the idea of providing short notes on Patterno Buchi Reaction, which comes under the Organic Chemistry section of the Chemical Science syllabus. 

The short notes on Patterno Buchi Reaction are 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 to prepare for the CSIR NET examination; here are the most reliable study notes to make the topics easier for you and also help you save time for the preparations for the upcoming CSIR-NET 2022 exam.

Short Notes on Patterno Buchi Reaction


It is a [2+2] cycloaddition reaction with an excited carbonyl and an alkene in which a four-membered oxetane ring is formed.


And once the C=O ground state is photoexcited, either a singlet or a triplet state is formed, as follows-


NOTE: For aromatic carbonyl compounds, the reaction occurs through a triplet excited state of the carbonyl compound. 

For aliphatic carbonyl compounds, the reaction occurs through both, the singlet, and the triplet state of the carbonyl compound.

Any kind of transition (n,π* and π,π*) and electronic state (singlet, triplet) may participate in the first stage of this reaction, and a diradical intermediate is formed, as follows-



For aliphatic carbonyl compounds, the reaction is stereospecific and yields a syn product.

For cyclic alkenes, the kinetically controlled endo isomer is the major product formed in this reaction.

The regioselectivity depends on-

  1. Stability of intermediate formed.
  2. Steric interactions of the intermediate diradical.


The products formed are structural isomers.

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