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42557-87-9

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42557-87-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 42557-87-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,5,5 and 7 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 42557-87:
(7*4)+(6*2)+(5*5)+(4*5)+(3*7)+(2*8)+(1*7)=129
129 % 10 = 9
So 42557-87-9 is a valid CAS Registry Number.

42557-87-9Downstream Products

42557-87-9Relevant articles and documents

Kinetic Study of the Homolytic Brominolysis of 1,2-Diarylcyclopropanes

Applequist, Douglas E.,Gdanski, Rick D.

, p. 2502 - 2510 (2007/10/02)

The rate constants for the photolytic brominolysis of 22 trans-1,2-diarylcyclopropanes in carbon disulfide relative to an internal standard, p-chlorotoluene, have been determined.The products of the brominolysis are 1,3-dibromo-1,3-diarylpropanes.The rate constants range over 5 orders of magnitude, being enhanced by electrondonating substituents on one or both benzene rings.The quantitative size of the substituent effect (ρ) at either involved carbon center is a function of the substituent at the other center.This fact suggests a continuum of transition-state structures with varying degrees of bond breaking and charge separation.

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