The proton nmr spectra of three monosubstituted succinic anhydrides (I) and six disubstituted succinic anhydrides (II, III) and corresponding acids, salts, and esters have been analyzed. Proton-proton and CI3-proton spin-coupling constants and proton chemical shifts are reported. An unusually large solvent effect on JH-H'and JC13-H for dl- dibromosuccinic anhydride is reported. Substituent effects on Jvlcinal for acyclic ...