Q.2
Reaction between alkene and acetophenone derivative in hexane in the presence of light produces oxetane derivative
Which reaction is this ?
- Paternò–Büchi Photochemical Reaction:
- The photochemical $[2+2]$ cycloaddition between an excited carbonyl compound (e.g., acetophenone derivative) and an alkene to construct a four-membered oxetane heterocycle is known as the Paternò–Büchi reaction (discovered by Emanuele Paternò in 1909 and developed by George Büchi in 1954).
- Other reactions: Diels-Alder is a $[4+2]$ thermal cycloaddition yielding cyclohexenes; Wittig converts carbonyls to alkenes; Kolbe is electrochemical or carboxylation.
- Conclusion: The reaction is the Paternò–Büchi reaction (Option 4).
Correct option: (4) Paterno Buchi reaction
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