Use of methanolysis in the characterization of O-(2-hydroxypropyl)cellulose by 13C-n.m.r. spectroscopy
โ Scribed by Dae-Sil Lee; Arthur S. Perlin
- Book ID
- 107725360
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 237 KB
- Volume
- 124
- Category
- Article
- ISSN
- 0008-6215
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๐ SIMILAR VOLUMES
## 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
## Abstract The charge separation between the dithiole ring and oxygen in 3โ(1โฒ,2โฒโdithioleโ3โฒโylidene)โ6โmethylโ2,3โdihydropyranโ2,4โdiones and 3โ(1โฒ,2โฒโdithioleโ3โฒโylidene)โ2,3โdihydrobenzo[__b__] pyranโ2,4โdiones has been determined by ^13^C and ^19^F n.m.r. spectroscopy. By both methods it is f
## Magic-angle 13C n.m.r. spectra have been obtained for a series of vitrinite concentrates. Proper modification of the cross-polarization pulse sequence allows separation of protonated and nonprotonated carbon resonances. This technique is used to determine the relative fraction of nonprotonated