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170998-52-4

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170998-52-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 170998-52-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,0,9,9 and 8 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 170998-52:
(8*1)+(7*7)+(6*0)+(5*9)+(4*9)+(3*8)+(2*5)+(1*2)=174
174 % 10 = 4
So 170998-52-4 is a valid CAS Registry Number.

170998-52-4Relevant articles and documents

EFFECT OF PROTECTING GROUPS AND SOLVENTS IN ANOMERIC O-ALKYLATION OF MANNOPYRANOSE

Tamura, Junichi,Schmidt, R. R.

, p. 895 - 912 (2007/10/02)

Anomeric O-alkylation of mannopyranoses with various protecting groups was investigated using mannose derivatives and 2,3-O-isopropylidene-1-O-trifluoromethanesulfonyl-D-glycerol (1) as alkylating agent.Generally, in polar solvents higher α/β ratios were obtained than in nonpolar solvents.Sterically demanding protecting groups at the 6-O-position and polar solvents led to higher yields.Reactivity differences were explained by different complex formation.Based on these results mannopyranosyl-α(1-4)glucopyranosides 26 and 27 were synthesized using mannose derivatives 5 and 6 having a 6-O-(p-methoxyphenyl)diphenylmethyl group and galactosyl trifluoromethanesulfonate 24 or nonafluorobutanesulfonate (nonaflate) 25, respectively, as alkylating agents.

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