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128421-57-8

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128421-57-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128421-57-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,4,2 and 1 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 128421-57:
(8*1)+(7*2)+(6*8)+(5*4)+(4*2)+(3*1)+(2*5)+(1*7)=118
118 % 10 = 8
So 128421-57-8 is a valid CAS Registry Number.

128421-57-8Downstream Products

128421-57-8Relevant articles and documents

A Kinetic Study of the 1,3-Cycloaddition of Benzonitrile Oxides to para-Substituted β-Aminocinnamonitriles

Gelli, Gioanna,Cadoni, Enzo,Deriu, Antonello,Beltrame, Paolo

, p. 245 - 250 (2007/10/02)

Stable arylnitrile oxides undergo 1,3-cycloaddition to β-aminocinnamonitriles at the CN or the C=C bond, which gives rise to 3,5-disubstituted 1,2,4-oxadiazoles or 3,5-diaryl-4-cyanoisoxazoles, respectively, by parallel reactions in different solvents.Overall kinetics were measured at temperatures in the range 50-90 deg C; product selectivities were determined by HPLC, rate coefficients for the parallel reactions were, thus, obtained.Rates were enhanced by increasing the solvent polarity.Hammett plots for substitution on the nitrile oxide benzene ring were V-shaped; those for substitution on the enaminonitrile benzene ring had negative ρ-values.

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