Abstract
AbstractThe C4‐cyclomerization photosensitized by carbonyl compounds is a type of reaction capable of various generalizations. It opens up the synthesis of cyclobutane‐ and cyclobutene‐derivatives often not otherwise amenable.Among the main types of photosensitization the photosensitized C4‐cyclomerization belongs to the biradical relais‐mechanisms. In some cases the possibility of a mere physical excitation‐transfer from the excited sensitizer to the substrates has been eliminated. Presumably in all cases photosensitized C4‐cyclomerization occurs via homogeneous catalysis involving the production of short‐lived photoadduct‐biradicals composed of excited sensitizer and unsaturated substrate.
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