“…Tetrahydro-2-furylsuccinic Anhydride (9).-The title compound 9 was obtained as a colorless, mobile liquid in 50% yield by peroxide-initiated free-radical addition of maleic anhydride to tetrahydrofuran according to the method of Jacobs and Ecke. 10 The adduct 9, bp 107-111°( 0.1 mm), had the following spectral data: ir (neat) 1865, 1792, 1225, 1070, and 925 cm""1; nmr (CDC13) 1.8-2.4 (m, 4 H, methylenes of the furyl ring), 2.8-3.5 (m, 3 H, anhydride ring protons), 2.6-4.0 (m, 2 H, -CH2O-), and 4.1-4.5 (m, 1 H, -CH2OCH-).…”