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28817-88-1

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28817-88-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28817-88-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,8,1 and 7 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 28817-88:
(7*2)+(6*8)+(5*8)+(4*1)+(3*7)+(2*8)+(1*8)=151
151 % 10 = 1
So 28817-88-1 is a valid CAS Registry Number.

28817-88-1Relevant articles and documents

A New Synthesis of D-Glycosiduronates from Unprotected D-Uronic Acids

Bertho, Jean-Noel,Ferrieres, Vincent,Plusquellec, Daniel

, p. 1391 - 1394 (2007/10/02)

O-Glycosidation of totally O-unprotected D-galacturonic acid 1 in THF provides α-pyranosides 4a when promoted with BF3*OEt2 whereas β-furanosides 6β were obtained in the presence of FeCl3; when the same reaction is performed with D-glucuronic acid 2 or 'D-glucurone' 3, alkyl-D-glucofuranosidurono-6,3-lactones 7 are synthesized in excellent yields and high β-selectivity.

The preparation and susceptibility to hydrolysis of novel O-galacturonoyl derivatives of carbohydrates

Brown, John A.,Fry, Stephen C.

, p. 95 - 106 (2007/10/02)

D-Galacturonic acid or (1->4)-α-D-galacturonan reacted in aqueous pyridine in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide with alcohols to yield esters.The alcohols that gave high yields of D-galacturonoyl derivatives were primary and included methanol, ethanol, 1-propanol, D-glucose, D-galactose, methyl β-D-glucopyranoside, methyl β-D-galactopyranoside, and cellulose.D-Galacturonic acid itself readily gave an O-D-galacturonoyl-D-galacturonic acid.The proposed structure of one compound, methyl 6-O-D-galacturonoyl-β-D-glucopyranoside, was supported by 1H and 13C NMR data and the FAB mass-spectral data.Each ester was hydrolysed at pH 11 and 25 deg C within 1 h.O-D-Galacturonoyl-D-glucose was considerably more alkali labile than O-polygalacturonoyl-D-glucose, and O-D-galacturonoylcellulose had an intermediate stability.The esters were relatively stable to cold acid, but could be hydrolysed by M trifluoroacetic acid at 100 deg C for 1 h.The esters tested were resistant to digestion by "Driselase", although the glycosidic bonds of O-polygalacturonoyl D-glucose were hydrolysed to yield O-oligogalacturonoyl-D-glucoses of low molecular weight.The possible application of these analytical methods to the detection of O-uronoyl-type cross-links in cell-wall polysaccharides is discussed.

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