N-Methylphthalimide (Nh4P) undergoes a pair of competing photochemical reactions in the presence of alkenes. In one of these reactions the alkene adds to the C (0)-N bond of NMP in a concerted 7?+ 2 process that ultimately leads to 2-benzazepine-1, bdiones (5). A competing electron-transfer process results in the formation of a radical cation-radical anion pair which can be efficiently trapped in alcohol solvents such as 4. The regiochemistry of ...
