Paterno-Buchi reaction

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Here an electronically exited carbonyl group is added to a ground state olefin yielding an oxetane.
Here an electronically exited carbonyl group is added to a ground state olefin yielding an oxetane.

The Paternò-Büchi reaction is a photochemical reaction in organic chemistry combining an alkene and a compound with carbonyl functionality. The product of the reaction is a 4-membered oxygen containing ring known as an oxetane.