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69687-19-0

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69687-19-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 69687-19-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,6,8 and 7 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 69687-19:
(7*6)+(6*9)+(5*6)+(4*8)+(3*7)+(2*1)+(1*9)=190
190 % 10 = 0
So 69687-19-0 is a valid CAS Registry Number.

69687-19-0Relevant articles and documents

Preparation and reactions of optically active cyanohydrins derived from 4-chlorobenzaldehyde, cyclohexanone and 2-methylcyclohexanone using the (R) hydroxynitrile lyase from Prunus amygdalus

Yosef,Elmasry,Ismael, Eman H. I.,Mahran

, p. 745 - 755 (2013/05/21)

CYANURATION of 4-chlorobenzaldehyde (1), cyclohexanone (2a) and 2-methylcyclo-hexanone (2b) yielded the racemic 2-hydroxy-2-(4-chlorophenyl) ethanenitrile (R,S)-3, cyclohexanone cyanohydrin 21a and (R,S)-2- methylcyclohexanone cyanohydrin (R,S)-21b. The same reaction can be completed by using acetone cyanohydrin (4) as a transcyanating agent. The optically active cyanohydrins (R)-3 and (R)-21b could be respectively obtained by hydrocyanation of 1 and 2b using (R)-hydroxynitrile lyase (R) PaHNL [EC 4.1.2.10] from almonds (Prunus amygdalus) as a chiral catalyst. Cyanohydrins 3 and 21 in their racemic and optically active forms undergo a number of transformations which involve either the hydroxyl group or the cyanide function. Moreover, derivatization of 3 and 21b with (S)-Naproxen chloride (S)-7 gave the respective diastereoisomers 8 and 22b. The optical activities of (R)-3 and 21b as well as their derivatives were recorded. The postulated structures of the new products were supported with compatible elementary and spectroscopic (IR, 1H NMR, 13C NMR, MS and X-ray crystallography) analyses. The antitumor activity of some selected racemic new products and their respective optically active analogues were undertaken. The structure-activity relationship (SAR) was also discussed.

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