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pro vyhledávání: '"35"'
Publikováno v:
Journal of the American Chemical Society. 123(11)
Xanthine oxidase is a molybdenum-containing enzyme that catalyzes the hydroxylation of xanthine and a wide variety of other aromatic heterocycles. In the course of the reaction with xanthine and substrates such as 2-hydroxy-6-methylpurine (HMP), the
Autor:
Y. Maeda, K. U. Ingold
Publikováno v:
Journal of the American Chemical Society. 102:328-331
A search for a dialkylaminyl radical which rearranges at a rate suitable for study by kinetic EPR spectroscopy has shown that cyclobutyl-n-propylaminyl is such a species. This radical undergoes ring opening, and the rate constant for this process can
Publikováno v:
Journal of the American Chemical Society. 138:2500-2503
The synthesis and isolation of stable main group radicals remains an ongoing challenge. Here we report the application of frustrated Lewis pair chemistry to the synthesis of boron-containing radicals. H2 activation with polyaromatic diones and B(C6F5
Autor:
Johannes A. M. Hepperle, Brooks J. Culotta, Gerhard Erker, Allan Jay P. Cardenas, Stefan Grimme, Jeffrey L. Petersen, Roland Fröhlich, Armido Studer, Timothy H. Warren, Gerald Kehr, Constantin G. Daniliuc, Annika Stute, Birgitta Schirmer, Muhammad Sajid
Publikováno v:
Journal of the American Chemical Society
The intramolecular cyclohexylene-bridged P/B frustrated Lewis pair [Mes(2)P-C(6)H(10)-B(C(6)F(5))(2)] 1b reacts rapidly with NO to give the persistent FLP-NO aminoxyl radical 2b formed by P/B addition to the nitrogen atom of NO. This species was full
Autor:
Mohammad R. Seyedsayamdost, Tomislav Argirević, JoAnne Stubbe, Ellen Catherine Minnihan, Marina Bennati
Publikováno v:
Journal of the American Chemical Society
E. coli ribonucleotide reductase (RNR) catalyzes the conversion of nucleotides to deoxynucleotides, a process that requires long-range radical transfer over 35 A from a tyrosyl radical (Y(122)*) within the beta2 subunit to a cysteine residue (C(439))
Autor:
E. C. Abresch, and Melvin Y. Okamura, George Feher, Rafael Calvo, Mark L. Paddock, Wolfgang Lubitz, Wulf Hofbauer, Robert Bittl, R.A. Isaacson
Publikováno v:
Journal of the American Chemical Society. 122:7327-7341
The photocycle of bacterial photosynthetic reaction centers (RCs) involves electron transfer between two quinone molecules, QA and QB. The semiquinone biradical QA-•QB-• forms an intermediate state in this process. We trapped the biradical at low
Publikováno v:
Journal of the American Chemical Society. 129(51)
It was recently suggested that partially reduced monoamine oxidase (MAO) A contains an equilibrium mixture of an anionic flavin radical and a tyrosyl radical (Rigby, S. E.; et al. J. Biol. Chem. 2005, 280, 4627-4632). These observations formed the ba
Autor:
Marilyn R. Gunner, P. Leslie Dutton
Publikováno v:
Journal of the American Chemical Society. 111:3400-3412
The rate of electron transfer from BPh{sup {sm bullet}{minus}} to Q{sub A} (k{sub 1}) was determined at 14, 35, 113, and 298 K in reaction center protein from Rhodobacter sphaeroides R-26 in which the native Q{sub A}, UQ{sub 10}, was removed and acti
Autor:
Roger V. Lloyd, David E. Wood
Publikováno v:
Journal of the American Chemical Society. 97:5986-5992
The $beta$-halo-tert-butyl radicals were prepared by x-irradiation of the corresponding isobutyl halides in an adamantane matrix at 77$sup 0$K and their conformations were determined by analysis of their EPR spectra. The radicals are nonplanar at the