Tetrahydropyran
Title: Tetrahydropyran
CAS Registry Number: 142-68-7
Additional Names: Pentamethylene oxide
Molecular Formula: C5H10O
Molecular Weight: 86.13
Percent Composition: C 69.72%, H 11.70%, O 18.58%
Literature References: Prepd by hydrogenation of dihydropyran (from furfural): Paul, Bull. Soc. Chim. Fr. [4] 53, 1489 (1933); Andrus, Johnson, Org. Synth. 23, 90 (1943); Cass, Ind. Eng. Chem. 40, 219 (1948).
Properties: Mobile, flammable liquid. Pungent, sweetish odor. d420 0.8814. mp -49.2°. bp 88°. nD20 1.4211. Dipole moment 1.87. Flash pt -4.0°F. Azeotrope with water, bp 71°, contains 8.5% H2O. Sol in water [relative solubilities: Bennett, Philip, J. Chem. Soc. 1928, (1939)]. Miscible with alcohol, ether, many other organic solvents. Forms peroxides on exposure to air. All technical tetrahydropyran is stabilized against peroxide formation.
Melting point: mp -49.2°
Boiling point: bp 88°; bp 71°
Flash point: Flash pt -4.0°F
Index of refraction: nD20 1.4211
Density: d420 0.8814

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