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1639441-54-5

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1639441-54-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1639441-54-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,3,9,4,4 and 1 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1639441-54:
(9*1)+(8*6)+(7*3)+(6*9)+(5*4)+(4*4)+(3*1)+(2*5)+(1*4)=185
185 % 10 = 5
So 1639441-54-5 is a valid CAS Registry Number.

1639441-54-5Downstream Products

1639441-54-5Relevant articles and documents

Direct asymmetric dearomatization of pyridines and pyrazines by iridium-catalyzed allylic amination reactions

Yang, Ze-Peng,Wu, Qing-Feng,You, Shu-Li

, p. 6986 - 6989 (2014/07/08)

The first iridium-catalyzed intramolecular asymmetric allylic dearomatization reaction of pyridines and pyrazines has been realized. 2,3-Dihydroindolizine and 6,7-dihydropyrrolo[1,2-a]pyrazine derivatives were obtained with excellent yields and enantioselectivity. This methodology features dearomatization by direct N-allylic alkylation of pyridines or pyrazines under mild reaction conditions. Getting 'rid' of aromaticity: An iridium-catalyzed intramolecular asymmetric allylic dearomatization reaction converts pyridines and pyrazines (not shown) into 2,3-dihydroindolizine and 6,7-dihydropyrrolo[1,2- a]pyrazine derivatives with excellent yields and enantioselectivities. The dearomatization proceeds by direct N-allylic alkylation of pyridines or pyrazines under mild reaction conditions.

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