Interligand interactions affecting specific metal bonding to nucleic acid bases. A case of [Rh2(OAc)4], [Rh2(HNOCCF3)4], and [Rh2(OAc)2(HNOCCF3)2] toward purine nucleobases and nucleosides
作者:Katsuyuki Aoki、Md.Abdus Salam
DOI:10.1016/s0020-1693(02)01042-3
日期:2002.11
Abstract The reaction of [Rh2(OAc)4] with adenine, 9-methyladenine, 9-ethylguanine, adenosine, guanosine, deoxyguanosine, or inosine in methanolic aqueoussolution at room temperature gave specifically and quantitatively pink complexes of adenine or its derivatives (=L), [Rh2(OAc)4(L)] (the dirhodium-core:L ratio of 1:1). The reaction of [Rh2(HNOCCF3)4] or [Rh2(OAc)2(HNOCCF3)2] with these nucleobases or nucleosides
Isolation, Characterization, and DNA Binding Kinetics of Three Dirhodium(II,II) Carboxyamidate Complexes: Rh<sub>2</sub>(μ-L)(HNOCCF<sub>3</sub>)<sub>3</sub> where L= [OOCCH<sub>3</sub>]<sup>−</sup>, [OOCCF<sub>3</sub>]<sup>−</sup>, or [HNOCCF<sub>3</sub>]<sup>−</sup>
作者:Shari U. Dunham、Todd S. Remaley、Bryn S. Moore、Debra L. Evans、Stephen U. Dunham
DOI:10.1021/ic1023532
日期:2011.4.18
experiments reveal that changing one bridging ligand on compounds with the general formula Rh2(μ-L)(HNOCCF3)3 alters the rate of DNA-binding by greater than 100-fold with μ-L = trifluoroacetate ≫ acetate > trifluoroacetamidate. These three dirhodium compounds are isolated as the major products of the reaction between Rh2(OOCCH3)4 and trifluoroacetamide in either refluxing chlorobenzene or molten trifluoroacetamide
Syntheses, electrochemistry, and spectroscopy of dirhodium(<scp>II</scp>) tetra-acetamidate and tetrakis(trifluoroacetamide) complexes with axial Group 15 substituents. The X-ray crystal structures of [Rh<sub>2</sub>(CH<sub>3</sub>CONH)<sub>4</sub>(AsPh<sub>3</sub>)<sub>2</sub>] and [Rh<sub>2</sub>(CH<sub>3</sub>CONH)<sub>4 –n</sub>(CH<sub>3</sub>CO<sub>2</sub>)<sub>n</sub>(MPh<sub>3</sub>)<sub>2</sub>], M = As or Sb, n≈ 1
作者:Stephen P. Best、Peter Chandley、Robin J. H. Clark、Simon McCarthy、Michael B. Hursthouse、Paul A. Bates
DOI:10.1039/dt9890000581
日期:——
oxygen or nitrogen atoms trans to each other. The wavenumber of the rhodium–rhodium stretching mode [ν(RhRh)] has been identified from the resonance Raman spectra and found to be 273.5, 283.5, and 294 cm–1 for the phosphine, arsine, and stibine tetra-acetamidate complexes, respectively; ν(RhRh) is insensitive to trifluoroacetamidate for acetamidate substitution despite the fact that the oxidation potential
Polymer complexes of rhodium(II) trifluoroacetamidate dimers bridged by bidentate ligands [Rh2(HNOCCF3)4(L)}n], L = pyrazine (pyz), 4,4′-bipyridine (4,4′-bpy), and 1,4-diazabicyclo[2.2.2]octane (dabco), have been prepared and characterized.
The Lewis acid-mediated [3 + 2] cycloaddition of N-sulfonyl- and N-sulfamoylaziridines with alkenes provides a rapid and efficient access to 1-azaspiro[4.n]alkanes. Experimental studies have been combined with DFT calculations to explore the mechanism of the reaction. They demonstrate that the nature of the electron-withdrawing nitrogen protecting group has a very limited influence on the course of the reaction and, particularly, on the initial formation of the 1,3-zwitterionic species through C-N bond cleavage, which has been found to be the rate-determining step. Compared to N-sulfonylaziridines, N-sulfamoylaziridines have proved to be more synthetically useful synthons that afford crystalline polycyclic structures in good yields. A short sequence of catalytic C(sp(3))-H aminationcyclization[3 + 2] cycloaddition has then been successfully designed to afford the homologue 1-azaspiro[5.n]alkanes, thereby illustrating the higher versatility of sulfamates in these cycloadditions.