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81838-42-8

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81838-42-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81838-42-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,3 and 8 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 81838-42:
(7*8)+(6*1)+(5*8)+(4*3)+(3*8)+(2*4)+(1*2)=148
148 % 10 = 8
So 81838-42-8 is a valid CAS Registry Number.

81838-42-8Relevant articles and documents

Enantioselective synthesis of dihydrocoumarin derivatives by chiral scandium(iii)-complex catalyzed inverse-electron-demand hetero-Diels-Alder reaction

Hu, Haipeng,Liu, Yangbin,Guo, Jing,Lin, Lili,Xu, Yali,Liu, Xiaohua,Feng, Xiaoming

supporting information, p. 3835 - 3837 (2015/03/31)

An asymmetric inverse-electron-demand hetero-Diels-Alder reaction between o-quinone methides and azlactones to generate potentially pharmacological active dihydrocoumarins has been achieved efficiently by using a chiral N,N′-dioxide-Sc(iii) complex as the catalyst. The desired products were obtained in high yields with excellent enantioselectivities and diastereoselectivities (up to 94% yield, 96% ee and >19:1 dr) under mild reaction conditions. A concerted reaction pathway was confirmed by Operando IR and control experiments.

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