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28139-51-7

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28139-51-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28139-51-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,1,3 and 9 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 28139-51:
(7*2)+(6*8)+(5*1)+(4*3)+(3*9)+(2*5)+(1*1)=117
117 % 10 = 7
So 28139-51-7 is a valid CAS Registry Number.

28139-51-7Relevant articles and documents

Mechanistic criteria for cation radical reactions: Aminium salt-catalyzed cyclopropanation

Yueh, Wang,Bauld, Nathan L.

, p. 5671 - 5676 (1995)

Mechanistic studies of the cyclopropanation of a series of trans-stilbenes by ethyl diazoacetate catalyzed by two different triarylaminium salts decisively confirm a cation radical mechanism and rule out a hypothetical electrophilic mechanism. The elucidation of key aspects of these cation radical mechanisms, including kinetic vs equilibrium control of ionization and chain vs catalytic mechanisms, has also been achieved for these systems. New mechanistic criteria for the positive identification of cation radical mechanisms are proposed.

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