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Intramolecular [2+2] photocycloaddition of 1,6-dienes incorporated in a furanose ring. Unusual formation of cis-syn-cis 6-oxatricyclo[6.2.0.0 3,7 ]decanes
Intramolecular [2+2] photocycloaddition of 1,6-dienes incorporated in a furanose ring either in the presence of a copper(I) catalyst or with a sensitiser led to the unusual formation of cis-syn-cis adducts.