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66557-17-3

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66557-17-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 66557-17-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,5,5 and 7 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 66557-17:
(7*6)+(6*6)+(5*5)+(4*5)+(3*7)+(2*1)+(1*7)=153
153 % 10 = 3
So 66557-17-3 is a valid CAS Registry Number.

66557-17-3Relevant articles and documents

The first total synthesis of tarennane, a potent antioxidant chalcone constituent from tarenna attenuate or Magnolia officinalis

Yang, Jincheng,Yang, Tao,Luo, Youfu,He, Jun,Shi, Jianyou,Peng, Aihua

experimental part, p. 258 - 263 (2012/04/18)

The convergent total synthesis of tarennane has been accomplished in six steps starting from commercially available phloroglucinol and guaiacol; the key step of the synthesis relies on a highly regioselective Heck reaction applying iodophenol and PdCl2(PPh3)2.

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