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491024-78-3

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491024-78-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 491024-78-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,9,1,0,2 and 4 respectively; the second part has 2 digits, 7 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 491024-78:
(8*4)+(7*9)+(6*1)+(5*0)+(4*2)+(3*4)+(2*7)+(1*8)=143
143 % 10 = 3
So 491024-78-3 is a valid CAS Registry Number.

491024-78-3Relevant articles and documents

Dynamic helical chirality of an intramolecularly hydrogen-bonded bisoxazoline

Preston, Adam J.,Fraenkel, Gideon,Chow, Albert,Gallucci, Judith C.,Parquette, Jon R.

, p. 22 - 26 (2003)

The synthesis and conformational properties of 2,6-bis-[2-((4S)-4-methyl-4,5-dihydro-1,3-oxazol-2- yl)phenyl]carbam oylpyridines, 2, have been described. Bisoxazoline 2a was prepared in five steps from 2-nitrobenzoyl chloride in an overall yield of 71%. In contrast to related structures such as 1, bisoxazoline 2a exhibits a highly biased P-type helical conformation in solution and in the solid state. In the crystal lattice, 2a further assembles into a left-handed helical superstructure aligned along the crystallographic c axis. The barrier to helical interconversion, as measured by line-shape analysis of the temperature-dependent 1H NMR spectra of thiobenzyl derivative 2b, was determined to be quite low (ΔG? = 12.3 kcal/mol), indicating the presence of a highly dynamic helical chirality.

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