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1000189-56-9

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1000189-56-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1000189-56-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,0,0,1,8 and 9 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1000189-56:
(9*1)+(8*0)+(7*0)+(6*0)+(5*1)+(4*8)+(3*9)+(2*5)+(1*6)=89
89 % 10 = 9
So 1000189-56-9 is a valid CAS Registry Number.

1000189-56-9Downstream Products

1000189-56-9Relevant articles and documents

Facile and efficient regioselective synthesis of 1-(3′-substituted quinoxalin-2′-yl)-3-aryl/heteroaryl-5-methylpyrazoles

Aggarwal, Ranjana,Masan, Eakta,Sumran, Garima

, p. 1842 - 1848 (2013/05/21)

This report describes an efficient and practical approach for regioselective synthesis of 1-(3′-substituted quinoxalin-2′-yl)-3- aryl/heteroaryl-5-methylpyrazoles (3a-j). Reaction of 2-chloro-3-substituted quinoxalines (1) with 3(5)-methyl-5(3)-aryl-1H-pyrazoles (2) in the presence of sodium hydride furnished the title compounds in excellent yields with good levels of regioselectivity. The present protocol is superior to the existing method, which yielded a mixture of regioisomeric pyrazoles (I, II) and triazolo[4,3-a]quinoxalines (III). Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications to view the free supplemental file.

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