Abstract The syntheses of two compounds, which are fused-ring succinimides, prepared as potential anticon-vulsants, are described. The compounds are 3, 4, 5, 6-tetrahydro-7-methyl- 6-oxoindeno [7, 1-bc] thiepin-4a, 5-(2H) dicarboximide and 6, 7, 8, 9-tetrahydro-2-oxo-1H-