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129503-20-4

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129503-20-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 129503-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,5,0 and 3 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 129503-20:
(8*1)+(7*2)+(6*9)+(5*5)+(4*0)+(3*3)+(2*2)+(1*0)=114
114 % 10 = 4
So 129503-20-4 is a valid CAS Registry Number.

129503-20-4Relevant articles and documents

Synthetic Routes to 2-(2-Benzofuranyl)benzoic Acids and their Cyclization into Benzindenofuran-10-ones

Guillaumel, Jean,Boccara, Nicole,Demerseman, Pierre

, p. 1047 - 1051 (2007/10/02)

The benzindenofuran-10-ones 1 were prepared by the intramolecular cyclization of the 2-(2-benzofuranyl)benzoic acids, 2, the unequivocal routes to which are described herein.Various synthetic methods to these acids were tested, as well as the methods to cyclize them.

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