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16888-96-3

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16888-96-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 16888-96-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,8,8 and 8 respectively; the second part has 2 digits, 9 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 16888-96:
(7*1)+(6*6)+(5*8)+(4*8)+(3*8)+(2*9)+(1*6)=163
163 % 10 = 3
So 16888-96-3 is a valid CAS Registry Number.

16888-96-3Downstream Products

16888-96-3Relevant articles and documents

The use of benzamide derivatives of secondary amines for stereochemical studies by circular dichroism

Gawronski, Jacek,Kolbon, Halina,Kwit, Marcin

, p. 85 - 92 (2007/10/03)

The benzamide chromophore is widely used as a Cottonogenic derivative of primary amines for stereochemical studies by circular dichroism. The assignments based on the exciton chirality method are reliable since the benzamide group has well-defined geometry and conformation. A recent report U.D. Chisholm, J. Golik, B. Krishnan, J.A. Matson, D.L. Van Vranken, J. Am. Chem. Soc. 1999, 121: 3801-3802) claimed a caveat in the application of the exciton chirality method to benzamides derived from secondary amines. By the use of benzoyl derivatives of amino alcohols (1-4) and diamines (5, 6) of known absolute configuration we demonstrate that the 250-210 nm range exciton Cotton effects due to secondary and tertiary benzamides are generally of opposite sign. The origin of such disparity is traced to different conformational equilibria of the amide C-N bond in secondary and tertiary benzamides, as shown by semiempirical molecular modelling and NMR data. This feature can be useful in the determination of absolute configuration by analysis of the CD spectra due to exciton coupling of tertiary benzamides.

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