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221657-39-2

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221657-39-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 221657-39-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,6,5 and 7 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 221657-39:
(8*2)+(7*2)+(6*1)+(5*6)+(4*5)+(3*7)+(2*3)+(1*9)=122
122 % 10 = 2
So 221657-39-2 is a valid CAS Registry Number.

221657-39-2Downstream Products

221657-39-2Relevant academic research and scientific papers

Asymmetric conjugate addition to cyclic enone catalyzed by Cu-NHC complexes with C2 symmetry

Shan, Fengjun,Jiang, Lan,Li, Zhengning,Zhao, Defeng

, p. 973 - 977 (2011)

A series of chiral, C2 symmetric tridentate N-heterocyclic carbene precursors, containing two N-functionalized hydroxyl or alkoxyl groups, were synthesized. They were applied to catalyze the asymmetric conjugate addition of diethylzinc to cyclo

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