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28256-99-7

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28256-99-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28256-99-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,2,5 and 6 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 28256-99:
(7*2)+(6*8)+(5*2)+(4*5)+(3*6)+(2*9)+(1*9)=137
137 % 10 = 7
So 28256-99-7 is a valid CAS Registry Number.

28256-99-7Downstream Products

28256-99-7Relevant articles and documents

Azaborininones: Synthesis and Structural Analysis of a Carbonyl-Containing Class of Azaborines

Davies, Geraint H. M.,Mukhtar, Asma,Saeednia, Borna,Sherafat, Fatemeh,Kelly, Christopher B.,Molander, Gary A.

, p. 5380 - 5390 (2017/05/24)

An approach to access azaborininones (carbonyl-containing, boron-based heterocyclic scaffolds) using simple reagents and conditions from both organotrifluoroborates and boronic acids is described. An inexpensive, common reagent, SiO2, was found to serve as both a fluorophile and desiccant to facilitate the annulation process across three different azaborininone platforms. Computational analysis of some of the cores synthesized in this study was undertaken to compare the azaborininones with the analogous carbon-based heterocyclic systems. Computationally derived pKa values, NICS aromaticity calculations, and electrostatic potential surfaces revealed a unique isoelectronic/isostructural relationship between these azaborines and their carbon isosteres that changed based on boron connectivity. Correlation to experimentally derived data supports the computational findings.

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