Abstract
We have explored the regio- and stereoselectivity in the [2+2] photocycloaddition, so-called Paterno-Buchi reaction, of silyl ketene acetals with carbonyl compounds. The structures of the intermediates, i.e. radical cation, exciplex, 1, 4-biradical, have been proposed to be an important factor of controlling the selectivities. This account provides the useful information on the selective synthesis of oxetane derivatives.
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