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19657-56-8

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19657-56-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19657-56-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,6,5 and 7 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 19657-56:
(7*1)+(6*9)+(5*6)+(4*5)+(3*7)+(2*5)+(1*6)=148
148 % 10 = 8
So 19657-56-8 is a valid CAS Registry Number.

19657-56-8Relevant articles and documents

Aminopyridine-Borane Complexes as Hydrogen Atom Donor Reagents: Reaction Mechanism and Substrate Selectivity

Barth, Florian,Achrainer, Florian,Pütz, Alexander M.,Zipse, Hendrik

supporting information, p. 13455 - 13464 (2017/10/05)

Lewis base-borane complexes are shown to be potent hydrogen atom donors in radical chain reduction reactions. Results obtained in 1H, 11B, and 13C NMR measurements and kinetic experiments support a complex reaction mechanism involving the parent borane as well as its initial reaction products as active hydrogen atom donors. Efficient reduction reactions of iodides, bromides, and xanthates in apolar solvents rely on initiator systems generating oxygen-centered radicals under thermal conditions and pyridine-borane complexes carrying solubilizing substituents. In contrast to tin hydride reagents, the pyridine-boranes reduce xanthates faster than the corresponding iodides.

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