Merging Halogen-Atom Transfer (XAT) and Cobalt Catalysis to Override E2-Selectivity in the Elimination of Alkyl Halides: A Mild Route toward contra-Thermodynamic Olefins

2021 ◽  
Author(s):  
Huaibo Zhao ◽  
Alastair J. McMillan ◽  
Timothée Constantin ◽  
Rory C. Mykura ◽  
Fabio Juliá ◽  
...  
Keyword(s):  
Halogen Atom ◽  
Alkyl Halides ◽  
Atom Transfer

Photoredox Polyfluoroarylation of Alkyl Halides via Halogen Atom Transfer

2022 ◽  
Author(s):  
Ben Niu ◽  
Krishnakumar Sachidanandan ◽  
Bryan G. Blackburn ◽  
Maria Victoria Cooke ◽  
Sébastien Laulhé
Keyword(s):  
Halogen Atom ◽  
Alkyl Halides ◽  
Atom Transfer

Evidence for photochemical synthesis of fluoromethane

2020 ◽  
Vol 35 (9) ◽  
pp. 1720-1726
Author(s):  
Ralph E. Sturgeon ◽  
Enea Pagliano
Keyword(s):  
Acetic Acid ◽  
Acid Medium ◽  
Halogen Atom ◽  
Photochemical Synthesis ◽  
Atom Transfer ◽  
Acetic Acid Medium ◽  
Catalytic Capacity

Cu2+ – assisted photomethylation of fluoride in dilute acetic acid medium is suggested to occur by radical halogen atom transfer, with Cu(ii) acting in a catalytic capacity.

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.

Proposal for halogen atom transfer mechanism for Ullmann O-arylation of phenols with aryl halides

2012 ◽  
Vol 41 (45) ◽  
pp. 13832 ◽  
Author(s):  
Songlin Zhang ◽  
Zhenzhong Zhu ◽  
Yuqiang Ding
Keyword(s):  
Halogen Atom ◽  
Transfer Mechanism ◽  
Aryl Halides ◽  
Atom Transfer

Characterization of Cu(II) Bipyridine Complexes in Halogen Atom Transfer Reactions by Electron Spin Resonance

2003 ◽  
Vol 36 (22) ◽  
pp. 8291-8296 ◽  
Author(s):  
Bernhard Knuehl ◽  
Tomislav Pintauer ◽  
Atsushi Kajiwara ◽  
Hanns Fischer ◽  
Krzysztof Matyjaszewski
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Halogen Atom ◽  
Transfer Reactions ◽  
Atom Transfer ◽  
Spin Resonance ◽  
Atom Transfer Reactions

Nuclear Recoil Reactions in Organomanganese Compounds. VI. IMn(CO)5 and BrMn(CO)5

1972 ◽  
Vol 50 (7) ◽  
pp. 961-965 ◽  
Author(s):  
I. G. De Jong ◽  
D. R. Wiles
Keyword(s):  
Thermal Treatment ◽  
Thermal Effects ◽  
Halogen Atom ◽  
Nuclear Recoil ◽  
Atom Transfer ◽  
Organomanganese Compounds ◽  
Radiochemical Yields

Radiochemical reactions of 82Br, 128I, and 56Mn have been studied in neutron-irradiated BrMn(CO)5 and IMn(CO)5. The parent compounds were found to contain 49 and 28% of the 82Br and 128I, but only 6 and 10% of the 56Mn, respectively. The dimeric [XMn(CO)4]2 accounted for 28% of the 82Br, but only about 2% of the 56Mn. Some 56Mn2(CO)10 was also found. The radiochemical yields of several products were found to increase substantially on thermal treatment of the target material.Reaction pathways are suggested which can account for the thermal effects, which involve halogen atom transfer and carbonyl transfer in the solid.

A new and effective route to (±)-botryodiplodin and (±)-epi-botryodiplodin acetates using a halogen atom transfer Ueno–Stork cyclization

2006 ◽  
Vol 47 (44) ◽  
pp. 7759-7762 ◽  
Author(s):  
Laurent De Buyck ◽  
Cristina Forzato ◽  
Franco Ghelfi ◽  
Adele Mucci ◽  
Patrizia Nitti ◽  
...  
Keyword(s):  
Halogen Atom ◽  
Atom Transfer

Atom Transfer Polymerization of Methyl Methacrylate Mediated by Alkylpyridylmethanimine Type Ligands, Copper(I) Bromide, and Alkyl Halides in Hydrocarbon Solution

1999 ◽  
Vol 32 (7) ◽  
pp. 2110-2119 ◽  
Author(s):  
David M. Haddleton ◽  
Martin C. Crossman ◽  
Bogdan H. Dana ◽  
David J. Duncalf ◽  
Alex M. Heming ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Alkyl Halides ◽  
Atom Transfer ◽  
Hydrocarbon Solution
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