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The preparation of O-methyl- and O-ethyl-celluloses having controlled distribution of substituents

โœ Scribed by Tetsuo Kondo; Derek G. Gray


Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
698 KB
Volume
220
Category
Article
ISSN
0008-6215

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## ABSTRACX The distribution of substituents in six 0-ethyl-0-(2-hydroxyethyl)celluloses has been investigated by methylation analysis. The samples were prepared under conditions analogous to those used industrially. An analysis of the results, under simplified assumptions, indicates that the dist

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A method is described for the analysis of positions of substitution of O-methyl and O-ethyl groups in commercial samples of O-methylcellulose and O-ethylcellulose, respectively. The method requires perethylation of O-methyl-cellulose and permethylation of O-ethylcellulose. Subsequent reductive cleav

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## Structural characteristics of 0-(2-hydroxypropyl)cellulose samples, namely the molar substitution (mol. subst.), the total degree of substitution (d.s.), and the individual degree of substitution of hydroxyl groups on the glucose residues for a wide mol. subst . range of samples were determined