6-Deoxy-celluloses

The interaction of 5,6-cellulosene with tributyl lead hydride during the formation of the latter gave a lead-containing derivative of 6-deoxy-cellulose (45) ... 

Finally, oxidation with TEMPO or periodate, respectively yielding 6-carboxy derivatives (glucuronans) and dialdehyde cellulose, should be mentioned. 6-Alde-hydo cellulose has been prepared via 6-azido-6-deoxy-cellulose and analyzed by gas-liquid chromatography (GLC)-MS of its deuterium-labeled reduced constituents. ... 

The preparation of water-soluble cyanoethyl and carboxyethyl derivatives of native cellulose has been described." 6-Chloro-6-deoxy- and 6-iodo-6-deoxy-cellulose have been prepared by treatment of cellulose 2,3-di-6>-acetate with jV-chlorosuccinimide or iV-iodosuccinimide, respectively, followed by de-0-acetylation. ... 

A variety of synthetic procedures have been used to prepare deoxy celluloses (28). Most involve displacement of a good leaving group, e.g., a tosylate or mesylate group,... 

Deoxy cellulose may be prepared by first synthesizing the cellulose monotosylate. The tosylate group can be readily removed by a halide to produce the halide deoxy cellulose, CELL-X. Explain why this series of reactions help confirm the chemical structure of cellulose. 

Cellulose is converted to chlorine deoxy cellulose whieh is reacted with an amino acid to form a carboxy-subslituted amino deoxy cellulose. Show the reactions involved. 

Chitosan, having a similar chemical backbone as cellulose, is a linear polymer composed of a partially deacety-lated material of chitin [(l-4)-2-acetamide-2-deoxy-/3-D-glucan]. Grafting copolymer chains onto chitosan can improve some properties of the resulting copolymers [48-50]. Yang et al. [16] reported the grafting reaction of chitosan using the Ce(IV) ion as an initiator, but no detailed mechanism of this initiation has been published so far. 

The 3-deoxyhexoses were obtained crystalline after separation on a column of cellulose, a rather tedious operation recently separation of these sugars by fractional crystallization has been reported (41). From the major unsaturated ester 27, 3-deoxy-D-ribo- and -arabino-hexose were shown to have been produced respectively in the ratio 66 34, and from ester 28 in the ratio 24 76. Saturation of the enol grouping of the esters 27 and 28 gives, therefore, the 1,2-cis products preferentially. However, some hydrogenolysis of the anomeric acetate group accompanies simple saturation of the double bond and poses another separation problem. 

Valonia, cellulose, 326, 329-330 Vitamin B6, biosynthesis, 1-deoxy-D-threo-pentulose in, 287 Vitamin C... 

In a study on the alkaline stability of cellulose, Clayton and Jones188 chromatographed the trimethylsilyl ether of 1-amino-1-deoxy-D-glu-citol, and the retention time of a synthetic aminodisaccharide alditol has been given.487... 

The dolichol-linked D-mannosyl, D-glucosyl, and 2-acetamido-2-deoxy-D-glucosyl residues are used in the glycosylation of proteins and in the biosynthesis of D-m an nan.2,35 GlcNAc-PP-Dol may also play a role in the synthesis of glycosaminoglycans. Reaction 4 is the first step in the formation of lipid-linked precursors for cellulose.46... 

I. Fluoro — Cellulose Fluoro-deoxy- (3-F — x-alkoxy — 2-OH-propyl)-(F14-2H-hcptyl)-... 

Amethopterin (Methotrexate, 4-amino-4-deoxy-Ar -methyIpteroyl-L-glutamic acid) [59-05-2] M 454.4, m 185-204°(dec), [a]p°+19° (c 2, 0.1N aq NaOH). Commonest impurities are 10-methyl pteroylglutamic acid, 4-amino-10-methylpteroylglutamic acid, aminopterin and pteroylglutamic acid. Purified by chromatography on Dowex-1 acetate, followed by filtration through a mixture of cellulose and... 

Many polysaccharides besides starch and cellulose are important components of animal tissues, or play a vital role in biochemical processes. One example is chitin, a celluloselike material that is the structural component of the hard shells of insects and crustaceans. The difference between chitin and cellulose is that instead of being a polymer of glucose, chitin is a polymer of 2-deoxy-2-A-ethanamidoglucose (M-acetyl-jS-D-glucosamine) ... 

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