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871502-91-9

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871502-91-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 871502-91-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,1,5,0 and 2 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 871502-91:
(8*8)+(7*7)+(6*1)+(5*5)+(4*0)+(3*2)+(2*9)+(1*1)=169
169 % 10 = 9
So 871502-91-9 is a valid CAS Registry Number.

871502-91-9Relevant articles and documents

Furan ring opening - Isocoumarine ring closure: A recyclization reaction of 2-carboxyaryldifurylmethanes

Abaev, Vladimir T.,Dmitriev, Artem S.,Gutnov, Andrey V.,Podelyakin, Sergey A.,Butin, Alexander V.

, p. 1195 - 1204 (2007/10/03)

A general method for the synthesis of isocoumarine derivatives has been developed. Bis(5-R-2-furyl)methylbenzoic acids (R = methyl, ethyl) underwent recyclization and subsequent cyclization into tetracyclic isochromene-1-one derivatives under treatment with hydrogen chloride in methanol. It has been shown that intermediate 4-(5-R-furan-2-yl)-3-(3-oxo-3-R-propyl)-isochromene-1- ones can be obtained selectively by varying a concentration of the hydrogen chloride and reaction times. In the case of R = tert-butyl only corresponding 4-[5-(tert-butyl)-2-furyl]-3-(4,4-dimethyl-3-oxopentyl)-1-isochromenones were isolated regardless of the reaction conditions.

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