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157027-50-4

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157027-50-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157027-50-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,0,2 and 7 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 157027-50:
(8*1)+(7*5)+(6*7)+(5*0)+(4*2)+(3*7)+(2*5)+(1*0)=124
124 % 10 = 4
So 157027-50-4 is a valid CAS Registry Number.

157027-50-4Relevant articles and documents

Regioselective Azidation of 2,4-Dichloroquinolines

Steinschifter, Waltraud,Stadlbauer, Wolfgang

, p. 311 - 318 (2007/10/02)

Reactions of 2,4-dichloroquinolines (2a-f) with sodium azide in DMF lead either regioselectively to 4-azido-2-chloroquinolines (3a-f) or with excess of sodium azide and catalysts to 5-azido-tetrazoloquinolines (4a-f). 2,4-Dichloroquinolines (2g-i) having electron donating substituents in 3-position react with sodium azide in DMF to a mixture of 4-azido-2-chloroquinolines (3g-i) and 5-chlorotetrazoloquinolines (5g-i).When the reaction of the 2,4-dichloroquinolines (2a-i) with sodium azide is carried out in ethanol with addition of methanesulfonic acid, regioselectively 5-chloro-tetrazoloquinolines (5a-i) are obtained.Structural assignments of 3 and 5 have been carried out by 13C-NMR spectra, IR spectra and degradation reactions of the azido- and tetrazolo group to aminoquinolines (7 and 10) via iminophosphoranes (8 and 9).It could be shown that in 2-azido/tetrazolo-quinolines (4 and 5) the tetrazole ring structure is the dominant species.

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