Cas 491856-37-2,5-(4-fluorophenyl)-3-phenyl-1-tosyl-4,5-dihydro-1H-pyrazole

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Check Digit Verification of cas no

The CAS Registry Mumber 491856-37-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,9,1,8,5 and 6 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 491856-37:
(8*4)+(7*9)+(6*1)+(5*8)+(4*5)+(3*6)+(2*3)+(1*7)=192
192 % 10 = 2
So 491856-37-2 is a valid CAS Registry Number.

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491856-37-2Relevant academic research and scientific papers

A complementary approach to 3,5-substituted pyrazoles with tosylhydrazones and terminal alkynes mediated by TfOH

Liu, Ping,Xu, Qian-Qian,Dong, Chao,Lei, Xinsheng,Lin, Guo-Qiang

supporting information, p. 2087 - 2092 (2012/11/07)

A complementary method for the preparation of 3,5-substituted pyrazoles in moderate to high yields has been explored via TfOH-induced addition of tosylhydrazones to the terminal alkynes. This acid-induced addition procedure might be an operationally safe alternative compared to typical 1,3-dipolar cycloaddition as there is no involvement of diazo compounds.

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