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The following transformation involves

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CSIR-UGC (NET) Chemical Science: Held on (18 Sept 2022)
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  1. i) Norrish type‐II; ii) fragmentation of a cyclopropyl diradical
  2. i) Norrish type‐I; ii) fragmentation of a cyclopropyl diradical
  3. i) Norrish type‐I; ii) di‐π‐methane rearrangement
  4. i) Norrish type‐II; ii) di‐π‐methane rearrangement

Answer (Detailed Solution Below)

Option 2 : i) Norrish type‐I; ii) fragmentation of a cyclopropyl diradical
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Concept:

The Norris Type I reaction is a chemical reaction used in organic synthesis to convert carbonyl compounds (such as ketones or aldehydes) into various functional groups. It is named after the American chemist Richard A.The Norris Type I reaction is a valuable tool in organic chemistry for functional group transformations. It involves the reaction of a carbonyl compound with a sulfur ylide to yield a product with different functionality.

Explanation:

⇒In Norris Type (I) reaction, 𝛼-clevage occured in the presence of light forming a radical. 𝛼-clevage is followed by fragmentation of cyclopropane ring and releases CO gas in air.

Mechanism:

Conclusion:

Hence, the transformation involves Norris Type (I) reaction and fragmentation of cyclopropyl diradical.

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