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174226-56-3

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174226-56-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 174226-56-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,4,2,2 and 6 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 174226-56:
(8*1)+(7*7)+(6*4)+(5*2)+(4*2)+(3*6)+(2*5)+(1*6)=133
133 % 10 = 3
So 174226-56-3 is a valid CAS Registry Number.

174226-56-3Relevant articles and documents

Evidence for a stepwise mechanism in formal hetero-Diels-Alder reactions of N-arylimines

Linkert, Frank,Laschat, Sabine,Kotila, Sirpa,Fox, Thomas

, p. 955 - 970 (1996)

In order to investigate the mechanism of Lewis acid-catalyzed cyclizations of ω-unsaturated N-arylimines, various prolinal-derived N-arylimines 17a-f were synthesized and treated with Lewis acids. Whereas imine 17a bearing a C-2 tether and imines 17d, f with terminal alkene or alkyne moieties could not be cyclized under these conditions, imine 17b with a C-3 tether gave three diastereomeric pyrrolo-[1',2':1,2]azepino[3,4-b]quinolines 18a-c and imine 17c gave two diasteromeric 7,7-diphenyl-indolizino-[3,4-b]quinolines 19a, b. High cis/trans-ratios were observed in both cases. Imine 17e bearing an internal alkyne underwent a cyclization/dehydrogenation to give the indolizino[3,4-b]quinoline 21. From these results a stepwise mechanism was concluded. The configuration of 19a was established by an X-ray crystal structure analysis.

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