Abstract
WE wish to direct attention to the anomalous melting points (82–87° C.) quoted in the literature1–7 for diphenylene oxide. It is likely that these anomalies are due in part to the mode of formation, and we have examined the particular cases of the isolation of diphenylene oxide (a) from coal tar distillates, and (b) by the distillation of phenol over litharge2.
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References
Hoffmeister, Ann., 159, 211 (m.p. 80–81° C.).
Gallewsky, Ann., 264, 189 (1891) (86–87° C.). ( Cullinane, J. Chem. Soc., 2268 (1930) (86–87° C.).)
Graebe and Ullmann, Ber., 29, 1876 (1896) (80–81° C.).
Cullinane, Morgan and Plummer, Rec. Trav. Chim., 56, 6 (83° C.).
Kruber, D.R.P., 491, 594 (84° C.).
Hale and Stoesser, U.S.P. 1,808,349 (82–83° C.).
"International Critical Tables", 1, 244 (87° C.).
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WILLIAMS, A. Purity of Diphenylene Oxide (Dibenzofuran). Nature 162, 925 (1948). https://doi.org/10.1038/162925b0
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DOI: https://doi.org/10.1038/162925b0
