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219782-24-8

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219782-24-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 219782-24-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,9,7,8 and 2 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 219782-24:
(8*2)+(7*1)+(6*9)+(5*7)+(4*8)+(3*2)+(2*2)+(1*4)=158
158 % 10 = 8
So 219782-24-8 is a valid CAS Registry Number.

219782-24-8Relevant articles and documents

Metal-free asymmetric 1,3-dipolar cycloaddition of N-arylmaleimides to azomethine ylides catalyzed by chiral tertiary amine thiourea

Bai, Jian-Fei,Wang, Liang-Liang,Peng, Lin,Guo, Yun-Long,Ming, Jun-Nan,Wang, Fei-Ying,Xu, Xiao-Ying,Wang, Li-Xin

experimental part, p. 4472 - 4478 (2011/10/01)

The first metal-free asymmetric 1,3-dipolar cycloaddition of N-arylmaleimides to azomethine ylides catalyzed by chiral tertiary amine thiourea to form multiply substituted pyrrolidines in excellent yields (up to 89%) and enantioselectivities (up to 96% ee) is presented. This procedure allows a rapid diversity-oriented synthesis of chiral pyrrolidine derivatives with high optical purity. A series of bifunctional thiourea catalysts were applied for the first time to the highly asymmetric 1,3-dipolar cycloaddition of N-arylmaleimides to azomethine ylides togive the products in excellent yields (up to 89%) and enantioselectivities (up to 96% ee).

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