On the Determination of Halogen Atom Reduction Potentials with Photoredox Catalysts

2021 ◽  
Author(s):  
Alexander M. Deetz ◽  
Ludovic Troian-Gautier ◽  
Sara A. M. Wehlin ◽  
Eric J. Piechota ◽  
Gerald J. Meyer
Keyword(s):  
Halogen Atom ◽  
Reduction Potentials

scholarly journals Absorption spectra of the alkyl halides: energies of the C-I and C-Br bonds

1931 ◽  
Vol 133 (822) ◽  
pp. 430-439 ◽  
Keyword(s):  
Excitation Energy ◽  
Absorption Spectra ◽  
Satisfactory Agreement ◽  
Halogen Atom ◽  
Alkyl Halides ◽  
Thermochemical Data ◽  
Long Wave ◽  
Absorption Of Light ◽  
Wave Limit

It is to be expected that the alkyl halides will dissociate on absorption of light into alkyl residues and excited halogen atoms. Their absorption spectra are continuous, as is also the case with phenyl iodide, which liberates iodine under identical conditions. The C-I and C-Br linkages are certainly homopolar in the gas state. On Franck’s theory the long-wave limit of the absorption continuum should correspond to the heat of binding of C-I together with the excitation energy of the halogen atom. We would expect the alkyl halides to resemble the halogen hydrides in their behaviour, although with HI and HBr the long-wave limits are not very happily situated. The limit for HI is at 3320 Å., corresponding to a heat of dissocia­tion of 65,000 calories (the thermochemical heat is 69,000 calories) and the limit for HBr at 2640 Å. (97,000 calories, the thermochemical being 85,000). It is doubtful if these disagreements are entirely due to inaccuracy in the thermochemical data. The determination of these absorption limits seems to be a difficult matter. However, in the case of some of the alkyl halides we have been successful in obtaining very satisfactory agreement between the two sets of data, and have thought it worth while to give a brief account of our experi­mental method, and to reproduce at least one of our photometric records.

Determination of absolute configuration using heavy atom based co-crystallization method: Halogen atom effects

2016 ◽  
Vol 1119 ◽  
pp. 269-275 ◽  
Author(s):  
Jian-Rong Wang ◽  
Xiaowu Fan ◽  
Qiaoce Ding ◽  
Xuefeng Mei
Keyword(s):  
Absolute Configuration ◽  
Halogen Atom ◽  
Heavy Atom ◽  
Crystallization Method ◽  
Determination Of Absolute Configuration

scholarly journals Aminoalkyl radicals as halogen-atom transfer agents for activation of alkyl and aryl halides

Science ◽  
2020 ◽  
Vol 367 (6481) ◽  
pp. 1021-1026 ◽  
Author(s):  
Timothée Constantin ◽  
Margherita Zanini ◽  
Alessio Regni ◽  
Nadeem S. Sheikh ◽  
Fabio Juliá ◽  
...  
Keyword(s):  
Halogen Atom ◽  
Building Blocks ◽  
Aryl Halides ◽  
Atom Transfer ◽  
Reduction Potentials ◽  
Tributyltin Hydride ◽  
Organic Halides ◽  
Wide Range ◽  
Carbon Carbon Bonds ◽  
Radical Processes

Organic halides are important building blocks in synthesis, but their use in (photo)redox chemistry is limited by their low reduction potentials. Halogen-atom transfer remains the most reliable approach to exploit these substrates in radical processes despite its requirement for hazardous reagents and initiators such as tributyltin hydride. In this study, we demonstrate that α-aminoalkyl radicals, easily accessible from simple amines, promote the homolytic activation of carbon-halogen bonds with a reactivity profile mirroring that of classical tin radicals. This strategy conveniently engages alkyl and aryl halides in a wide range of redox transformations to construct sp3-sp3, sp3-sp2, and sp2-sp2 carbon-carbon bonds under mild conditions with high chemoselectivity.

ChemInform Abstract: Equilibrium Between 2-Oxomorpholin-3-yl Radicals and Viologen Radicals. Determination of Reduction Potentials.

ChemInform ◽  
2010 ◽  
Vol 23 (18) ◽  
pp. no-no
Author(s):  
R. P. MAHONEY ◽  
P. A. FRETWELL ◽  
S. H. DEMIRDJI ◽  
R. L. III MAULDIN ◽  
O. JUN. BENSON ◽  
...  
Keyword(s):  
Reduction Potentials

Determination of oxidation-reduction potentials by spectropolarimetric titration: Application to several iron-sulfur proteins

1974 ◽  
Vol 162 (1) ◽  
pp. 301-309 ◽  
Author(s):  
Bacon Ke ◽  
William A. Bulen ◽  
Elwood R. Shaw ◽  
Robert H. Breezk
Keyword(s):  
Reduction Potentials ◽  
Iron Sulfur ◽  
Iron Sulfur Proteins ◽  
Oxidation Reduction

The determination of absolute electron affinities of chlorobenzenes, chloronaphthalenes and chlorinated biphenyls from reduction potentials

1991 ◽  
Vol 307 (1-2) ◽  
pp. 169-182 ◽  
Author(s):  
J.R. Wiley ◽  
E.C.M. Chen ◽  
E.S.D. Chen ◽  
P. Richardson ◽  
W.R. Reed ◽  
...  
Keyword(s):  
Electron Affinities ◽  
Reduction Potentials
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