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873842-68-3

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873842-68-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 873842-68-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,3,8,4 and 2 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 873842-68:
(8*8)+(7*7)+(6*3)+(5*8)+(4*4)+(3*2)+(2*6)+(1*8)=213
213 % 10 = 3
So 873842-68-3 is a valid CAS Registry Number.

873842-68-3Downstream Products

873842-68-3Relevant articles and documents

Preparation of 4,6,3',4'-tetrasubstituted aurones via aluminium oxide-catalyzed condensation

Bolek, David,Guetschow, Michael

, p. 1399 - 1403 (2005)

4,6,3',4'-Tetrasubstituted aurones were prepared by a protection- deprotection route with an alumina-catalyzed condensation of 3(2H)-benzofuranones with substituted aldehydes as the key step. Aureusidin (6) was obtained by demethylation of 4,6,3',4'-tetramethoxyaurone (5), a natural product from Cyperus capitatus. 4,6,3',4'-Tetrabenzyloxyaurone (9) was converted in a one hydrogenation-deprotection step to dihydroaureusidin (10).

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