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73199-40-3

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73199-40-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 73199-40-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,1,9 and 9 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 73199-40:
(7*7)+(6*3)+(5*1)+(4*9)+(3*9)+(2*4)+(1*0)=143
143 % 10 = 3
So 73199-40-3 is a valid CAS Registry Number.

73199-40-3Relevant articles and documents

Synthesis of 2-substituted 1,3-cycloheptanedione via a lewis acid mediated ring expansion reaction

Inomata, Kohei,Endo, Yasuyuki

, p. 997 - 1012 (2014/01/17)

We have established a new route to provide 2-substituted 1,3-cycloheptanediones via a Lewis acid mediated ring expansion reaction of cyclobutanones as the key step. The ring expansion reactions were mediated by a series of Lewis acids. Among the used Lewis acids, ZnI2 was the most practical mediator. This route has succeeded in providing the title compounds even on a multi-gram scale. During the research, the Baeyer-Villiger oxidation of the cyclobutanones to obtain the new bicyclic lactones was also examined. The regioselective oxidation was observed in the case of chlorinated cyclobutanones.

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