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244024-09-7

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244024-09-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 244024-09-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,4,0,2 and 4 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 244024-09:
(8*2)+(7*4)+(6*4)+(5*0)+(4*2)+(3*4)+(2*0)+(1*9)=97
97 % 10 = 7
So 244024-09-7 is a valid CAS Registry Number.

244024-09-7Relevant articles and documents

Total synthesis of (±)-nisamycin

Wipf, Peter,Coish, Philip D. G.

, p. 5053 - 5061 (1999)

We have developed a highly convergent synthesis of the manumycin-type m- C7N-antibiotic nisamycin that is applicable to other members of this family of antibiotics. The synthesis features a three-step sequence to the epoxyquinol core that serves as a scaffold for the attachment of the polyene side chains. The eastern polyene side chain was constructed via a novel organozirconocene-mediated synthesis. Zirconocene methodology was also applied to the synthesis of the polyene side chains of asukamycin. The southern side chain of nisamycin was introduced via a Stille reaction that employed a vinyl bromo ketone, derived from an acid-sensitive bromo ketal. Pd-mediated coupling of the vinyl bromide with a stannyl TIPS ester gave TIPS-protected nisamycin that was readily converted to the natural product.

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