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426828-26-4

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426828-26-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 426828-26-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,2,6,8,2 and 8 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 426828-26:
(8*4)+(7*2)+(6*6)+(5*8)+(4*2)+(3*8)+(2*2)+(1*6)=164
164 % 10 = 4
So 426828-26-4 is a valid CAS Registry Number.

426828-26-4Downstream Products

426828-26-4Relevant articles and documents

Synthesis of 4-acetylisocoumarin: First total syntheses of AGI-7 and sescandelin

Kim, Sanghee,Fan, Gao-Jun,Lee, Jaekwang,Lee, Jung Joon,Kim, Deukjoon

, p. 3127 - 3130 (2007/10/03)

A practical synthetic route to 4-acetylisocoumarins and the first total synthesis of AGI-7 (5) and sescandelin (4) are described. The readily available homophthalate 8 was transformed to the vinylogous amide ester 13 in high overall yield. Upon treatment of 13 with refluxing aqueous formic acid, the desired 4-acetylisocoumarin (5) and its regioisomer 3-methyl-4-formylisocoumarin (17) were produced in a 3:1 ratio. After separation of the desired product (5) from the unwanted minor isomer, the enantioselective reduction of AGI-7 by borane in the presence of Corey's (S)-oxazaborolidine reagent afforded (+)-sescandelin (4) with a 93% ee.

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