The major product formed in the following reaction is

This question was previously asked in
CSIR-UGC (NET) Chemical Science: Held on (15 Dec 2019)
View all CSIR NET Papers >

Answer (Detailed Solution Below)

Option 1 :
Free
Seating Arrangement
10 Qs. 20 Marks 15 Mins

Detailed Solution

Download Solution PDF

Concept:

The Danheiser annulation or Danheiser TMS-cyclopentene annulation is an organic reaction of an α,β-unsaturated ketone and a trialkylsilylallene (e.g., trimethylsilyl- or triisopropylsilyl-) in the presence of a Lewis Acid to give a trialkylsilylcyclopentene in a regiocontrolled annulation.

Mechanism:
  
Conclusion:
The correc t answer is option 1.

Latest CSIR NET Updates

Last updated on Jul 8, 2025

-> The CSIR NET June 2025 Exam Schedule has been released on its official website.The exam will be held on 28th July 2025.

-> The CSIR UGC NET is conducted in five subjects -Chemical Sciences, Earth Sciences, Life Sciences, Mathematical Sciences, and Physical Sciences. 

-> Postgraduates in the relevant streams can apply for this exam.

-> Candidates must download and practice questions from the CSIR NET Previous year papers. Attempting the CSIR NET mock tests are also very helpful in preparation.

Hot Links: online teen patti teen patti rules teen patti gold real cash