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97561-04-1

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97561-04-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 97561-04-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,5,6 and 1 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 97561-04:
(7*9)+(6*7)+(5*5)+(4*6)+(3*1)+(2*0)+(1*4)=161
161 % 10 = 1
So 97561-04-1 is a valid CAS Registry Number.

97561-04-1Relevant articles and documents

Efficient Preparation of Alkaloids Polycarpine and Polycarpaurines A and C

Guo, Pengbin,Yan, Shuang,Hu, Zeliang,Zhuang, Weihui,Xiong, Yan,Zhang, Lanya,Wang, Ziwen,Wang, Qingmin

, p. 121 - 124 (2017/02/05)

An efficient method for the preparation of alkaloids polycarpine and polycarpaurines A and C via microwave-assisted three-step one-pot reaction as the key step has been developed. This is the first report about the synthesis of polycarpaurines A and C. Starting from commercially available p-methoxybenzaldehyde, polycarpine and polycarpaurine A were obtained over seven steps with 40 and 24 % overall yield, respectively. Polycarpine could convert to polycarpaurine C in 72% yield in the presence of NaHSO3. The structure of polycarpine and polycarpaurines A and C was confirmed by1H NMR,13C NMR, and HRMS.

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