Cation radicals. 48. Evidence for electron transfer in the alkylation of thianthrene cation radical with diethylmercury

1983 ◽  
Vol 48 (2) ◽  
pp. 143-146 ◽  
Author(s):  
Kazuo Sugiyama ◽  
Henry J. Shine
Keyword(s):  
Electron Transfer ◽  
Cation Radical ◽  
Cation Radicals

Electron transport via metalloporphyrins

1978 ◽  
Vol 56 (10) ◽  
pp. 1381-1388 ◽  
Author(s):  
Eugene C. Johnson ◽  
Tony Niem ◽  
David Doolphin
Keyword(s):  
Electron Transfer ◽  
Electron Transport ◽  
Heme Proteins ◽  
Room Temperature ◽  
Cation Radical ◽  
Cation Radicals ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential ◽  
Internal Electron

The controlled potential electrolysis of Ni(II) meso-tetraphenylporphyrin (Ni(II)TPP) gives at room temperature the corresponding metalloporphyrin π-cation radical [Ni(II)TPP]+ •. Upon freezing a solution of the π-cation radical to 77 K an internal electron transfer occurs to give [Ni(III)TPP]+. A discussion of the routes of electron transport in heme proteins is given, and the roles of metalloporphyrin π-cation radicals in electron transport is evaluated.

1,3-Diketonatoboron difluoride sensitized cation radical reactions

1991 ◽  
Vol 69 (8) ◽  
pp. 1331-1336 ◽  
Author(s):  
Y. L. Chow ◽  
Xianen Cheng
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Ground State ◽  
Cation Radical ◽  
Radical Reactions ◽  
Singlet Excited State ◽  
Anti Isomer ◽  
Cation Radicals ◽  
Dibenzoylmethanatoboron Difluoride ◽  
Boron Complexes

Dibenzoylmethanatoboron difluoride (DBMBF2) and allied BF2 complexes interact from their singlet excited state with trans-anethole (t-A), quadricyclene (QC), and norbornadiene (NBD) by electron transfer to generate the corresponding cation radicals, which undergo the reported reactions. By sensitization, t-A undergoes dimerization to form the anti head-to-head and syn head-to-head dimers with retention of stereochemistry. The formation is reversible under sensitization conditions, leading to accumulation of the more stable anti isomer. However, irradiation of the absorption band of the DBMBF2 – t-A ground state complex did not lead to dimerization of t-A. By DBMBF2 sensitization, QC is cleanly converted to NBD while NBD is not affected. The calculation shows QC+• possesses higher energy than NBD+• by 7.5 kcal/mol, hence an irreversible rearrangement. Other sensitizers (e.g., cyanoaromatics and tetrachlorobenzoquinone) also promote these cation radical reactions but not as cleanly as DBMBF2. Key words: photosensitization by boron complexes, cation radical rearrangement, cation radical cycloaddition, electron transfer sensitization, photoreaction of ground state complexes.

Evidence for electron transfer in reactions of thianthrene cation radical with dialkylmercurials [Erratum to document cited in CA112(21):198622b]

1990 ◽  
Vol 55 (17) ◽  
pp. 5180-5180
Author(s):  
Stanislaw Lochynski ◽  
Henry J. Shine ◽  
Miroslaw Soroka ◽  
T. Krishnan Venkatachalam
Keyword(s):  
Electron Transfer ◽  
Cation Radical

ESR and optical study of electron transfer between the NO units of an N,N'-dialkoxyurea cation radical

1989 ◽  
Vol 111 (8) ◽  
pp. 2809-2815 ◽  
Author(s):  
Stephen F. Nelsen ◽  
James A. Thompson-Colon ◽  
Menahem Kaftory
Keyword(s):  
Electron Transfer ◽  
Cation Radical ◽  
Optical Study
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