Cellobial

Bromine adds to hexaacetylcellobial to yield a dibromide, and chlorine yields similarly a dichloride.65 Deacetylation produces free cellobial (LXV). As with lactal, cellobial also gives no pine splinter reaction, in contrast to the glycals with a free hydroxyl at carbon 4.64 Otherwise it displays the well known reactions of the glycals. Hydrogenation of... 

The treatment of cellobial with perbenzoic acid and water leads predominantly to 4-( 8-D-glucopyranosyl)-D-mannose.38 On the other hand, the treatment of hexaacetylcellobial in the same manner leads predominantly to cellobiose, which has been isolated as the octaacetyl derivative. Hexaacetylcellobial has also been made from the synthetically prepared epicellobiose, and the conversion of hexaacetylcellobial to cellobiose has completed the total synthesis of this important sugar.17... 

An acetyl group is easily removed as acetic acid from hexaacetyl-cellobial by boiling its aqueous solutions. Just as in the case of the other glycal acetates, it yields thereby the pentaacetylpseudocellobial (LXVIII).88 This compound can be acetylated to hexaacetylpseudo-... 

Cationogen, the term, II, 42 Cattle food, from bagasse, IV, 296 molasses as, IV, 334 from sugar beet pulp, IV, 297 Cedar bark, Western Red, pentosan content of, V, 271 Cellobial, II, 67 hexaacetate, III, 195 —, 2-hydroxy-, heptaacetate, V, 16 Cellobiitol, 1,5-anhydro-, heptaacetate, V, 2, 27... 

Figure 5.21 Reaction of enol ethers with glycosidases For references to the reactions depicted see text, for GH 2 lacZ enzyme Refs. 110 and 111, for hydration of exocyclic gluco compound Refs. 112 and 113 and reaction of cellobial Ref. 114.

D-glucal, D-galactal, L-rhamnal, cellobial, lactal, maltal... 

Virtually all the natural manifestations of cellulose are in the form of semi-crystalline fibres whose morphology and aspect ratio can vary greatly from species to species, as shown in Fig. 1.2. The subunits of each individual fibre are the microfibrils which in turn are made up of highly regular macromolecular strands bearing the cellobi-ose monomer unit, as shown in Fig. 1.3. 

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