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540741-19-3

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540741-19-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 540741-19-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,4,0,7,4 and 1 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 540741-19:
(8*5)+(7*4)+(6*0)+(5*7)+(4*4)+(3*1)+(2*1)+(1*9)=133
133 % 10 = 3
So 540741-19-3 is a valid CAS Registry Number.

540741-19-3Relevant articles and documents

An expedient, flexible and convergent access to selectively protected 1,5-dicarbonyl compounds. Applications to the synthesis of 2,6-disubstituted pyridines and thiopyridines

Boivin, Jean,Carpentier, Floriane,Jrad, Rafik

, p. 1664 - 1672 (2007/10/03)

Intermolecular addition of 2-oxoalkyl radicals generated from the corresponding S-alkyl-O-ethyl dithiocarbonates on vinyl ketals afforded selectively protected 1,5-dicarbonyl compounds in good yields. These key-intermediates can be converted into a plethora of useful substances. Transformations to pyridines and thiopyridines were given as examples. Georg Thieme Verlag Stuttgart.

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