Benzyl amylose

Amylose tricarbanilate Amylopectin Benzyl amylose DS = 3 Starch... 

The great majority of experimental variants discussed for benzylation (see Sect. 2.1) has also been applied for the preparation of allyl ethers. Among them, the alkylation with allyl bromide and sodium hydride in a dipolar aprotic solvent is most frequently used for complete allylation. Reaction with the methylsulfinyl carbanion in DMSO to form an alkoxide, followed by the reaction with allyl bromide provides a convenient high-yield route to 2,3,6-tri-O-allyl-amylose [227], With the limited amount of reagent, 35% of methyl 2-0-allyl-3,6-dideoxy-a-D-xy/o-hexopyranoside was synthesized from the corresponding glycoside [228]. The 2-allyl ether was the major product (43 % yield) of the reaction of methyl 4,6-0-benzylidene-a-D-glucopyranoside with allyl bromide and 1.1 equiv. of sodium hydride in benzene [71]. 

This acceleration has been explained by the hydrogen-bonding interaction of the copolymer with the substrate. Poly(p-styrenesulfonic acid-co-acrylic acid) has been found to catalyze the hydrolysis of amylose and sucrose Partially o-benzyl-... 

The data in table 11.3 indicates that the benzyl ester of the acetyl alanine is also retained to the greatest extent on amylose as well as cellulose. However, on derivatized amylose, the chiral selectivity is also the greatest for this alanine derivative. This is in direct contrast to the selectivity exhibited from the derivatized celluloses. The unsubstituted carbamate and the 4-Cl substituted carbamate give the greatest retention, indicating strong general polar interactivity, but virtually no chiral selectivity at all. The 3,5-dimethyl and 4-methyl substituted derivatives of amylose show the best chiral selectivity for the alanine derivatives... 

The activity of j8-amylase towards dialdehydo(periodate-oxidized)-amylose distinguishes it from other D-glucanases. The benzylation of amylose and molecular parameters for dilute solutions of carboxymethylamylose (sodium salt) have been reported. 

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