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189832-19-7

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189832-19-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 189832-19-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,8,3 and 2 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 189832-19:
(8*1)+(7*8)+(6*9)+(5*8)+(4*3)+(3*2)+(2*1)+(1*9)=187
187 % 10 = 7
So 189832-19-7 is a valid CAS Registry Number.

189832-19-7Relevant articles and documents

Synthetic studies on tautomycin synthesis of segment C

Jiang, Yimin,Ichikawa, Yoshiyasu,Isobe, Minoru

, p. 5103 - 5122 (2007/10/03)

Synthesis of Segment C of tautomycin was accomplished from two D-sugar derivatives. Pseudoenantiomeric heteroconjugate addition strategy allowed stereocontrolled synthesis of Sub-segment C-l. Sub-segment C-2 and its three diastereoisomers have been synthesized through heteroconjugate addition strategy and Mitsunobu reaction, Sub segment C-1 (epoxide electrophile) and C2 (sulfone carbanion) were coupled in the presence of boron trifluoride etherate (BF3·OEt2) to furnish Segment C.

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