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199447-37-5

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199447-37-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 199447-37-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,4,4 and 7 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 199447-37:
(8*1)+(7*9)+(6*9)+(5*4)+(4*4)+(3*7)+(2*3)+(1*7)=195
195 % 10 = 5
So 199447-37-5 is a valid CAS Registry Number.

199447-37-5Relevant articles and documents

Synthesis of symmetrical 2,2′,4,4′-tetrasubstituted [4,4′-bithiazole]-5,5′(4H,4′H)-diones and their reactions with some nucleophiles

Andersen, Kenneth K.,Bray, Diana D.,Kjaer, Anders,Lin, Yuhui,Shoja, Massud

, p. 1000 - 1015 (2007/10/03)

Symmetrical ,2′,4,4′-tetrasubstituted-[4,4′-bithiazole]-5,5′(4H, 4′H)-diones were obtained in high yields by oxidation of 5(4H)-thiazolones by KMnO4 in acetic acid. In some cases, the isomeric 2,4′- and 2,2′-bithiazolones were also formed. Results from two crossover reactions were consistent with a free radical mechanism. Four series of thiazolones were prepared, each based on a different substituent at the 2-position; i.e., phenyl, ethoxy, ethyl and ethylthio. The effects of substituents on the isomer distributions of the dehydrodimers indicated that electronic factors were less important than steric factors. X-Ray crystallography established the structure of the dehydrodimer (4R*,4′R*)-2,2′-diethoxy-4,4′-dibenzyl-[4,4′ -bithiazole]-5,5′(4H,4′H)-dione. One stereoisomer of 2,2′-diphenyl-4,4′-dimethyl-[4,4′-bithiazole]-5,5′(4H, 4′H)-dione and a mixture of the stereoisomers of 2,2′ -diphenyl-4,4′-dibenzyl-[4,4′-bithiazole]-5,5′(4H,4′H)- dione were treated with nucleophiles. The former gave imide derivatives of ,′-dehydrodimeric amino acids when the nucleophile was L-alanine ethyl ester or 1-butylamine. The structure of one of the reaction products, (4R*,5R*)-2,5-diphenyl-2-thiazoline-4-carboxylic acid piperidylamide, was established by X-ray crystallography. Treatment of stereoisomeric mixtures of 2,2′-diethoxy-4,4′-bithiazolones with HCl in benzene gave the corresponding racemic and meso bis-(N-carboxythioanhydride)s. A stereoisomeric mixture of the bis(N-carboxythioanhydride)s of leucine treated with glycine ethyl ester gave a bicyclic derivative of the ,′-dehydrodimeric amino acid. Acta Chemica Scandinavica 1997.

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