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31521-57-0

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31521-57-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 31521-57-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,5,2 and 1 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 31521-57:
(7*3)+(6*1)+(5*5)+(4*2)+(3*1)+(2*5)+(1*7)=80
80 % 10 = 0
So 31521-57-0 is a valid CAS Registry Number.

31521-57-0Downstream Products

31521-57-0Relevant articles and documents

Electrophilic ipso-Substitutions. Part 1. Reaction of 3-Substituted Indoles with Nitronium and Nitrosonium Ions

Colonna, Martino,Greci, Lucedio,Poloni, Marino

, p. 628 - 632 (2007/10/02)

3-Substituted indoles react with nitronium and nitrosonium ions to yield 3-nitroindole.In both cases the reaction was interpreted as an electrophilic ipso-substitution.The reaction mechanism is interpreted by hypothesizing the formation of a ?-complex-like intermediate, wich is some cases is preceded by an electron-transfer process.An order for the leaving abilities of the different electrofugal groups is discussed.

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