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157491-13-9

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157491-13-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157491-13-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,4,9 and 1 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 157491-13:
(8*1)+(7*5)+(6*7)+(5*4)+(4*9)+(3*1)+(2*1)+(1*3)=149
149 % 10 = 9
So 157491-13-9 is a valid CAS Registry Number.

157491-13-9Downstream Products

157491-13-9Relevant articles and documents

Reactions between nitrile oxides and carbenium ions: Synthesis of benzoxazines, oximes, and amides through intramolecular ortho or ipso attack

Auricchio, Sergio,Magnani, Caterina,Truscello, Ada M.

, p. 2411 - 2416 (2007/10/03)

Reactions between nitrile oxides and benzylic carbocations are described. Different results were obtained when the carbocations were generated from the corresponding chlorides with different Lewis acids, with addition products such as benzoxazines, oximes, and amides being produced. Primary, secondary, and tertiary carbocations showed different reactivities. The product ratios strongly depended on the substituents on the aromatic ring of the benzylic carbocations. Evidence for the proposed mechanism is reported. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

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