PHOTOCHEMICAL SYNTHESES: 10. ADDITION OF MALEIC ESTER TO CYCLOALKENES: THE PRODUCTS

Abstract
The intermolecular photochemical cycloaddition of maleic ester to cyclopentene and to cyclohexene has been observed. The saturated products were diesters of the (3:2:0) and (4:2:0) bicycloheptane and octane series, respectively. The stereochemistry of these products was studied and, in the latter series, derivatives of the trans-fused (4:2:0) bicyclooctane system identified.In addition to the saturated esters, cyclohex-2-enyl succinic ester and cyclopent-2-enyl succinic ester, produced by addition of the cycloalkenyl radical to maleic ester, also were formed.

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