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128643-87-8

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128643-87-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128643-87-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,6,4 and 3 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 128643-87:
(8*1)+(7*2)+(6*8)+(5*6)+(4*4)+(3*3)+(2*8)+(1*7)=148
148 % 10 = 8
So 128643-87-8 is a valid CAS Registry Number.

128643-87-8Relevant articles and documents

Synthesis of Glucuronoxylan Hexasaccharides by Preactivation-Based Glycosylations

B?hm, Maximilian,Madsen, Robert,Underlin, Emilie N.,d'Errico, Clotilde

supporting information, (2020/05/16)

The synthesis of two glucuronoxylans is described, which both consist of a pentaxylan backbone and a glucuronic acid linked to the 2 position in the fourth xylose residue from the reducing end. The two target molecules differ in the 4 position of the glucuronic acid where one is unsubstituted while the other contains a methyl ether. The pentaxylan backbone is assembled in four glycosylation reactions with phenyl thioglycoside donors. The couplings are performed by preactivation of the donor with in-situ-generated p-nitrobenzenesulfenyl triflate prior to addition of the acceptor. The glucuronic acids are then attached by Koenigs-Knorr glycosylations followed by deprotections. The syntheses employ a total of 8 steps from monosaccharide building blocks and afford the two glucuronoxylans in 12 and 15 % overall yield. The hexasaccharide products are valuable substrates for investigating the activity and specificity of glucuronoxylan-degrading enzymes.

SYNTHESIS OF THE TETRASACCHARIDE REPEATING-UNIT OF THE POLYSACCHARIDE FROM Klebsiella TYPE 23

Ray, Asim K.,Roy, Nirmolendu

, p. 95 - 100 (2007/10/02)

Methyl 2-O-allyl-4-O-benzyl-3-O-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)-α-L-rhamnopyranoside was obtained by condensing methyl 2-O-allyl-4-O-benzyl-α-L-rhamnopyranoside with tetra-O-acetyl-α-D-glucopyranosyl bromide.Benzylation, removal of the allyl g

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