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144882-57-5

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144882-57-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 144882-57-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,8,8 and 2 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 144882-57:
(8*1)+(7*4)+(6*4)+(5*8)+(4*8)+(3*2)+(2*5)+(1*7)=155
155 % 10 = 5
So 144882-57-5 is a valid CAS Registry Number.

144882-57-5Relevant articles and documents

An efficient approach to pyrroles and N-bridgehead pyrroles by propargylation/cycloamination of 4-amino-1-azabutadiene derivatives

Barluenga, Jose,Tomas, Miguel,Kouznetsov, Vladimir,Suarez-Sobrino, Angel,Rubio, Eduardo

, p. 2185 - 2190 (2007/10/03)

The thermal cycloamination of several propargyl-substituted 4-amino-1-azabutadienes 2 leading to 3-functionalized pyrroles 4-6 is described. Derivatives of pyrrolizidines 9 and indolizidines and azaazulenes 11-13 are synthesized directly from cyclic imines 7 and 10, respectively, in a multistep process that involves metalation with LDA, addition of a nitrile, carbanion trapping with propargyl bromide, and cycloamination. In all cases the more substituted imine nitrogen is involved in the cyclization reaction; such an experimental finding is supported by theoretical calculations.

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