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199991-74-7

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199991-74-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 199991-74-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,9,9 and 1 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 199991-74:
(8*1)+(7*9)+(6*9)+(5*9)+(4*9)+(3*1)+(2*7)+(1*4)=227
227 % 10 = 7
So 199991-74-7 is a valid CAS Registry Number.

199991-74-7Relevant articles and documents

Preparation of optically active azophenolic crown ethers containing 1-phenylethane-1,2-diol and 2,4-dimethyl-3-oxapentane-1,5-diol as a chiral subunit: Temperature-dependent enantiomer selectivity in the complexation with chiral amines

Ogasahara, Kazuko,Hirose, Keiji,Tobe, Yoshito,Naemura, Koichiro

, p. 3227 - 3236 (2007/10/03)

With (2S,4S)-2,4-dimethyl-3-oxapentane-1,5-diol and (S)- or (R)-1-phenylethane-1,2-diol as chiral subunits, optically active azophenolic crown ethers (S,S,S,S)-1, (R,S,S,R)-2, (S,S,S,S)-3 and (R,S,S,R)-4 possessing two phenyl and two methyl substituents together with the p-(2,4-dinitrophenylazo)phenol moiety have been prepared in enantiomerically pure forms. Temperature-dependent enantiomer selectivity in the complexation of these crown ethers with chiral amines has been studied by the UV-visible spectroscopic method in chloroform and from the observed association constants, thermodynamic parameters for the complexation have been calculated.

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