The NO2-, MeO-, Cl-, and Me-phenyl- N-substituted maleimides, N-phenyl-and N-benzylmaleimides, and the chlorosuccinanils were chromatographed on two grades of Silica Gel-G in thin-layer systems using developers of benzene and of mixtures of cyclohexane/ethyl acetate, 2:1 and 3:2. Isomers within any family were not separated, which, contradicts previous results with alumina, while families were resolved. The nonconjugated chlorosuccinanils behaved identically with the hindered and unhindered N-(chloro-phenyl)maleimides. There is no evidence of charge-transfer interaction of delocalized π electrons of planar conjugated maleimides with the silica surface.