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204990-96-5

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204990-96-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204990-96-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,9,9 and 0 respectively; the second part has 2 digits, 9 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 204990-96:
(8*2)+(7*0)+(6*4)+(5*9)+(4*9)+(3*0)+(2*9)+(1*6)=145
145 % 10 = 5
So 204990-96-5 is a valid CAS Registry Number.

204990-96-5Downstream Products

204990-96-5Relevant articles and documents

Enantiopure D-, L- (and 2-epi-) purpurosamine C-type glycosyl donors from racemic acrolein dimer - Biocatalytic resolution

Erbeck, Silke,Liang, Xifu,Krieger, Richard,Prinzbach, Horst

, p. 481 - 492 (2007/10/03)

Both enantiomers of purpurosamine C-type glycosyl donors [(ent)-9, (ent)-10, (ent)-11] and of a 2-azido epimer [(ent)-14] with a modified pattern of protecting groups have been prepared from racemic 3,4-dihydro-2H-pyran-2-carbalde-hyde (acroiein dimer, rac-1, "indirect aziridination", "azidonitration"). In two cases (rac-23β: methyl 6-O-acetyl-2,3,4-trideoxy-2α-trifluoroacetylamino-β-D/L- hexopyranoside, rac-32 : methyl 6-O-acetyl-2β-azido-2,3,4-trideoxy-β-D/L-hexopyranoside), efficient resolution has been achieved biocatalytically.

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