Preparation and Characterization of Persistent Maltose-Conjugated Triphenylmethyl Radicals
作者:Juan Antonio Mesa、Amado Velázquez-Palenzuela、Enric Brillas、Josep Coll、Josep Lluís Torres、Luis Juliá
DOI:10.1021/jo202356u
日期:2012.1.20
The condensation reaction of d-maltose to free radicals of the series of tris(2,4,6-trichlorophenyl)methyl (TTM) and tris(perchlorophenyl)methyl (PTM) has been described for the first time. The new persistent radicals 1 and 2 are very stable and have been characterized by EPR. Their cyclic voltammograms show a quasi-reversible process in the cathode, being reduced to the corresponding anions, with
Photochemistry of stable free radicals: the photolysis of perchlorotriphenylmethyl radicals
作者:Marye Anne Fox、Elizabeth Gaillard、Chia Chung Chen
DOI:10.1021/ja00257a030
日期:1987.11
a quantum efficiency of 0.3 under 365-nm irradiation. Transient absorption spectroscopy shows that this ring closure proceeds via two intermediates. The first decays in a unimolecular process (k/sub 2/ = 3.8 +/- 0.4 x 10/sup 6/ s/sup -1/) to produce the second which also decays unimolecularly (k/sub 3/ = 4.6 +/- 10/sup 4/ s/sup -1/) to yield PPF.
The perchlorotriphenylmethylradical (2) acts as a clathratehost for benzene, halogenobenzenes, and 1,4-dioxane giving inclusion compounds with different stabilities; the structure of (2)·C6H6, established by X-ray diffraction, shows the guest molecules located in channels between the hosts.
全氯三苯甲基基团(2)充当苯,卤代苯和1,4-二恶烷的包合物主体,产生具有不同稳定性的包合物;通过X射线衍射建立的(2)·C 6 H 6的结构表明,客体分子位于主体之间的通道中。
Oxidation of the Perchlorotriphenylmethyl Radical to the Carbocation, and Its Unique Abrupt Reversion
A solution of AlCl(3) in CH(2)Cl(2) reacts slowly, at room temperature, with perchlorotriphenylmethylradical (PTM(*)), an inertcarbonfreeradical, to give perchlorotriphenylmethyl cation (PTM(+)) quantitatively. However, by gradual addition of CH(2)Cl(2) into the resulting solution a point is reached where the PTM(+) reverts to PTM(*) instantaneously and quantitatively. A mechanism for this exceptional
Photochemistry and Spectroscopy of “Stable Organic Radicals”: Steric and Electronic Effects in Intermolecular Photoinduced Electron Transfer
作者:Marina Canepa、Marye Anne Fox、James K. Whitesell
DOI:10.1021/jo0017988
日期:2001.6.1
electron-transfer quenching were studied with several electron donors and acceptors. Fluorescence quenching studies demonstrate the importance of the redox potentials of the ET pair on the observed steric and electronic properties.