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Distillation of DMSO requires a partial vacuum to achieve a lower boiling point. DMSO is a polar aprotic solvent and is less toxic than other members of this class, such as dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, and hexamethylphosphoramide (HMPA).
Triple point: 291.67 K (18.52 °C), ? Pa Critical point [2] 720 K (447 °C), 5630 kPa Std enthalpy change of fusion, Δ fus H o: 14.37 kJ/mol Std entropy change of fusion, Δ fus S o: 49.26 J/(mol·K) Std enthalpy change of vaporization, Δ vap H o: 52.9 kJ/mol Std entropy change of vaporization, Δ vap S o? J/(mol·K) Solid properties Std ...
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: 298.9 44 –3.9
This page contains tables of azeotrope data for various binary and ternary mixtures of solvents. The data include the composition of a mixture by weight (in binary azeotropes, when only one fraction is given, it is the fraction of the second component), the boiling point (b.p.) of a component, the boiling point of a mixture, and the specific gravity of the mixture.
high boiling point dimethyl sulfoxide (CH 3) 2 SO 189 °C 46.7 1.1 g/cm 3: 3.96 reacts with strong bases, difficult to purify ethyl acetate: C 4 H 8 O 2: 77.11°C 6.02 0.902 g/cm 3: 1.88 reacts with strong bases hexamethylphosphoramide [(CH 3) 2 N] 3 PO 232.5 °C 29.6 1.03 g/cm 3: 5.38 high boiling point, high toxicity pyridine: C 5 H 5 N 115 ...
Deuterated DMSO, also known as dimethyl sulfoxide-d 6, is an isotopologue of dimethyl sulfoxide (DMSO, (CH 3) 2 S=O)) with chemical formula ((CD 3) 2 S=O) in which the hydrogen atoms ("H") are replaced with their isotope deuterium ("D"). Deuterated DMSO is a common solvent used in NMR spectroscopy.
Dimethyl sulfide is highly flammable; [33] its flash point is −38 °C (−36 °F) [34] or −49 °C (−56 °F). [35] Its self-ignition temperature is 205 °C (401 °F). [35] It is an eye and skin irritant and is harmful if swallowed. It has an unpleasant odor at even extremely low concentrations. [36]
Compounds with a boiling point lower than 150 °C typically are distilled at ambient pressure. For samples with high boiling points, short-path distillation apparatus is commonly employed. [3] [4] This technique is amply illustrated in Organic Synthesis. [5] [6]