Oxacyclohexane-2,6-dione (glutaric anhydride)

Abstract

Key indicators: single-crystal X-ray study; T = 240 K; mean (C-C) = 0.003 Å; R factor = 0.041; wR factor = 0.116; data-to-parameter ratio = 10.6.In the title compound, C 5 H 6 O 3 , the ring adopts a slightly distorted envelope conformation. Adjacent molecules are linked via weak C-HÁ Á ÁO contacts. Two phase transitions at temperatures of 154/183 and 172/192 K are observed for the title compound in a differential scanning calorimetry experiment; these occur below the structure determination temperature of 240 K. ExperimentalCrystal data C 5 H 6 O 3 M r = 114.10 Orthorhombic, P2 1 2 1 2 1 a = 5.410 (4) Å b = 7.520 (6) Å c = 13.180 (8) Å V = 536.2 (7) Å 3 Z = 4Mo K radiation = 0.12 mm À1

Chlorido(dimethyl 2,2′-bipyridine-4,4′-dicarboxylate-κ2N,N′)(η5-pentamethylcyclopentadienyl)rhodium(III) chloride 1-hydroxypyrrolidine-2,5-dione disolvate

“…NHS and its derivatives have been reported to form weak hydrogenbond interactions, e.g. O-HÁ Á ÁO, N-HÁ Á ÁO and C-HÁ Á ÁO (Stefanowicz et al, 2007).…”

Solubility Determination and Thermodynamic Modeling of Glutaric Anhydride in Diverse Solvent Systems Consisting of Acetic Acid, Ethanoic Anhydride, and Tetrachloromethane from T = (278.45 to 324.45) K

“…The DSC instrument was precalibrated with indium before the experiment. A pinch of glutaric anhydride (about 3 mg) was placed in a standard DSC aluminum pan and heated from 290.15 to 390.15 K at the rate of 10 K·min –1 under nitrogen atmosphere to obtain the melting temperature ( T m = 329.20 K) and the melting enthalpy (Δ fus H = 12.46 kJ·mol –1 ) of glutaric anhydride, which is shown in Figure …”