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1181844-56-3

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1181844-56-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1181844-56-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,8,1,8,4 and 4 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1181844-56:
(9*1)+(8*1)+(7*8)+(6*1)+(5*8)+(4*4)+(3*4)+(2*5)+(1*6)=163
163 % 10 = 3
So 1181844-56-3 is a valid CAS Registry Number.

1181844-56-3Downstream Products

1181844-56-3Relevant articles and documents

Copper(II)-catalyzed C-C bond-forming reactions of α-electron- withdrawing group-substituted ketene S,S-acetals with carbonyl compounds and a facile synthesis of coumarins

Yuan, Hong-Juan,Wang, Mang,Liu, Ying-Jie,Liu, Qun

, p. 112 - 116 (2009)

A new catalytic C-C bond-forming reaction has been developed. Catalyzed by cheap and commercially available copper(II) bromide (CuBr2; 10 mol%), the reactions of α-electron-withdrawing group (EWG)-substituted ketene S,S-acetals with aldehydes or ketones in acetonitrile at room temperature gave a variety of densely functionalized coupling products in excellent yields (80-98%). Based on this catalytic process, coumarin derivatives were efficiently synthesized when salicylaldehydes were selected as the carbonyl components.

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