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137845-71-7

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137845-71-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137845-71-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,8,4 and 5 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 137845-71:
(8*1)+(7*3)+(6*7)+(5*8)+(4*4)+(3*5)+(2*7)+(1*1)=157
157 % 10 = 7
So 137845-71-7 is a valid CAS Registry Number.

137845-71-7Relevant articles and documents

Gram-Scale Synthesis of Uridine 5'-Diphospho-N-acetylglucosamine: Comparison of Enzymatic and Chemical Routes

Heidlas, Juergen E.,Lees, Watson J.,Pale, Patrick,Whitesides, George M.

, p. 146 - 151 (1992)

Practical chemoenzymatic and chemical routes to uridine 5'-diphospho-N-acetylglucosamine (UDP-GlcNAc) on a gram scale have been developed.The chemoenzymatic synthesis provided convenient access to glucosamine-6-phosphate and N-acetylglucosamine-6-phosphate (GlcNAc-6-P) in > 10 mmol quantities.The condensation between GlcNAc-6-P and UTP was catalyzed by readily available crude enzyme extract from dried cells of the yeast Candida utilis and afforded a 17 percent yield of UDP-GlcNAc from GlcNAc-6-P.The otherwise straightforward chemoenzymatic sequence was hampered by the need to purify the product from the final complex reaction mixture.The chemical synthesis of UDP-GlcNAc proceeded through five steps in an overall yield of 15 percent from pentaacetylglucosamine with the selective formation of tetraacetylglucosamine-α-1-phosphate as the key reaction.

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