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Título: Studies on the carbonyl groups of oxidized celluloses.
Autores: Perlin, Arthur S.
Fecha: 1949
Publicador: McGill University
Fuente: Ver documento
Tipo: Electronic Thesis or Dissertation
Tema: Chemistry.
Descripción: The technical importance of cellulose oxidations, which play an undesirable part in such processes as bleaching and dyeing, and in the slow degradation that occurs during use, has served to promote research on the nature of the basic reactions involved. Many oxidations have been investigated[...] Most oxidations appear to be greatly dependent on the physical state of the cellulose and yield complex materials having varying proportions of carboxyl and carbonyl groups. With a few notable exceptions, methods available for estimating these groups are not entirely trustworthy and there is need for dependable methods of a general nature which could be applied throughout the field of cellulose oxidations. This Thesis was undertaken to develop a method of differentiating between carbonyl groups located in the second, third and sixth positions of the glucose units in cellulose. The procedure adopted consisted of adding the elements of hydrogen cyanide to the carbonyl units and reducing the adducts with hydriodic acid to the corresponding hydrocarbon units. It was necessary to repeat Kiliani’s parallel work with glucose and fructose, carried out in 1885-1887, most carefully in order to establish the best experimental conditions. A cellulose modified by diverse treatments and oxidized with chromium trioxide, was chosen for the research, and advantage was taken of the opportunity to compare the relative merits of various published estimations for carbonyl groups in oxidized celluloses.
Idioma: en