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5527-53-7

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5527-53-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5527-53-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,5,2 and 7 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 5527-53:
(6*5)+(5*5)+(4*2)+(3*7)+(2*5)+(1*3)=97
97 % 10 = 7
So 5527-53-7 is a valid CAS Registry Number.

5527-53-7Downstream Products

5527-53-7Relevant articles and documents

Primary Processes in the Type I Photocleavage of Dibenzyl Ketones. A Pulsed Laser and Photochemically Induced Dynamic Nuclear Polarization Study

Gould, Ian R.,Baretz, Bruce H.,Turro, Nicholas J.

, p. 925 - 929 (2007/10/02)

The primary homolytic α-cleavage, and subsequent decarbonylation of the intermediate phenacyl radicals, have been studied for the type I photoreaction of a series of dibenzyl ketones, using the techiques of pulsed laser photolysis and photochemically induced dynamic nuclear polarization (photo-CIDNP).Evidence for selective primary cleavage to produce the most stable radical pairs is obtained for unsymmetrical ketones.The absolute rate constants and activation parameters for the decarboxylations are obtained, and the relationships between these and the stabilities of the product radicals is discussed.

Substituent Effects on Benzyl Radical ESR Hyperfine Coupling Constants. The ?α*Scale Based upon Spin Delocalization

Dust, Julian M.,Arnold, Donald R.

, p. 1221 - 1227 (2007/10/02)

The electron spin resonance spectra of 21 para- and meta-substituted benzyl radicals have been analyzed.A substituent constant, ?α*, has been defined from the benzylic α-hydrogen hyperfine coupling constant.The ?α* constant reflects the component of energy that may be attributed to spin delocalization in a substituted benzyl radical in comparison to the unsubstituted radical.For the derivatives studied, para substitution is stabilizing, except when fluorine is the substituent; meta substitution destabilizes the benzyl radical.A series of radical reactions is reexamined with an extended Hammett relation.The relative importance of spin delocalization vs. polar effects is assessed by the ratio of ρ* to ρ.The importance of choosing substituents for which ?a* and ? differ widely for such an assessment is emphasized.

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