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1256640-02-4

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1256640-02-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1256640-02-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,5,6,6,4 and 0 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1256640-02:
(9*1)+(8*2)+(7*5)+(6*6)+(5*6)+(4*4)+(3*0)+(2*0)+(1*2)=144
144 % 10 = 4
So 1256640-02-4 is a valid CAS Registry Number.

1256640-02-4Relevant articles and documents

A bismuth(III)-catalyzed friedel-crafts cyclization and stereocontrolled organocatalytic approach to (-)-platensimycin

Eey, Stanley T.-C.,Lear, Martin J.

, p. 5510 - 5513 (2011/03/18)

A high yielding route to the (-)-platensimycin core is communicated. This entailed the discovery of Bi(OTf)3 to catalyze a Friedel-Crafts cyclization of a free lactol, supplemented by LiClO4 to suppress the Lewis basicity of the sulfonate group. After TBAF-promoted cyclodearomatization, a diastereoselective conjugate reduction of a dienone was achieved by adopting amine-based organocatalytic rationales to reverse the inherent steric control of the substrate.

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