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19744-05-9

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19744-05-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19744-05-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,7,4 and 4 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 19744-05:
(7*1)+(6*9)+(5*7)+(4*4)+(3*4)+(2*0)+(1*5)=129
129 % 10 = 9
So 19744-05-9 is a valid CAS Registry Number.

19744-05-9Relevant articles and documents

5-Acetoxy-2,3-diphenylisoxazolidine and 5-acetoxy-3-(4-nitrophenyl)-2-phenylisoxazolidine

Mukherjee, Shubhasish,Parmar, Virinder S.,Errington, William

, p. 1829 - 1831 (1999)

The configurations of the isoxazolidine rings in the title compounds, 2,3-diphenylisoxazolidin-5-yl acetate (C17H17NO3), (I), and 3-(4-nitrophenyl)-2-phenylisoxazolidin-5-yl acetate (C17H16N2/su

An efficient C2-homologation of aromatic aldehydes via 5-hydroxyisoxazolidines

Di Nunno,Scilimati

, p. 4121 - 4132 (2007/10/02)

The reaction of lithium enolate of acetaldehyde (generated by the known cycloreversion of THF in the presence of n-BuLi) with a number of aryl N-phenylnitrones affords 2-phenyl-3-aryl-5-hydroxyisoxazolidines (trans + cis) in high yields. A low conversion or no reaction at all were instead observed with some N-alkylnitrones (methyl and t-butyl, respectively). Base (or acid) induced decomposition of 5-hydroxyisoxazolidines allows cinnamaldehydes to be obtained in high yields. Thus the combination of the synthesis and decomposition of 5-hydroxyisoxazolidines provides a new efficient way for the C2-homologation of aromatic aldehydes.

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