Dipole moments of derivatives of glucose,galactose and lactose part I

Summary The dipole moments of the- and-isomers of 2, 3, 4, 6 tetraacetyl aoetyl D-glucose and 2, 3, 4, 6 tetraacetyl methyl D-glucose have been determined in solutions of benzene, by the application of the method of Halverstadt and Kumler. This is expected to remove from the older data the uncertainties introduced by the extrapolation methods.The moments of the penta-methyl derivatives of D-glucose, of the penta-acetyl derivative of-D-galactose and of the octaacetate of-lactose are also recorded.The effect of temperature on the dipole moments has not been found to be pronounced, in the range 30–40°C.

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Zusammenfassung Dipolmomente einiger Derivate von Glukose, Galaktose und Laktose wurden teilweise erstmals aus benzolischer Lösung ermittelt: Extrapolationsmethode auf unendliche Verdünnung nach Halverstadt und Kumler. Beseitigung einiger Unsicherheiten in früheren Bestimmungen. Es wurde kein wesentlicher Temperatureinfluß im Bereich von 30–40°C gefunden.

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The author wishes to express his gratitude to Dr. S. K. K. Jatkar, and to Dr. B. Sanjiva Rao for his unstinting and valuable help. He is thankful to Dr. R. J. W. Le Fèvre for his kind interest in the work. His thanks are also to the Indian Institute of Science for providing facilities for investigations.