Crystal Structures of Chiral Halo{2-[1-(S)-(dimethylamino)ethyl]phenyl-C1,N}mercury(II) Complexes
摘要:
The reaction of HgCl2 with enantiomerically pure o-lithio-(S)-(-)-dimethyl(1-phenylethyl)amine, (S)-ArLi, results in good yields of (S)-{HgCl[C6H4CH(Me)NMe(2)]}, 2a. The bromide (2b) and iodide (2c) analogs were prepared by metathetic reactions of 2a with NaBr and NaI, respectively. Single-crystal X-ray crystallographic data on all three complexes show that the Hg atom in each is nonplanar with three different groups bonded to it, making it a stereocenter. Thus, with the chiral benzylic carbon of the chelating amine ligand having the (S) absolute configuration, these complexes form as only the (S)(C)(R)(Hg) diastereomers.
When Applying the Mercury Poisoning Test to Palladacycle-Catalyzed Reactions, One Should Not Consider the Common Misconception of Mercury(0) Selectivity
作者:Olga N. Gorunova、Ivan M. Novitskiy、Yuri K. Grishin、Igor P. Gloriozov、Vitaly A. Roznyatovsky、Victor N. Khrustalev、Konstantin A. Kochetkov、Valery V. Dunina
DOI:10.1021/acs.organomet.8b00363
日期:2018.9.10
The aim of this study was to demonstrate the absolute necessity of control experiments for a correct interpretation of mercury drop test results when applied to mechanistic studies of palladacycle-catalyzed reactions. It was shown that the interaction of diverse azapalladacycles with metallic mercury leads to the formation of organomercuric chlorides during the redox-transmetalation process. The structure of these organomercurials was confirmed by elemental analysis, H-1, C-13H-1}, and Hg-199H-1} NMR spectra, X-ray diffraction analysis, and DFT calculations. The behavior and properties of C,N-mercuracycles bearing the weak and labile N center dot center dot center dot Hg bond are discussed on the basis of the temperature dependence of the NMR spectra and calculated thermodynamic parameters of the dechelation process.
Crystal Structures of Chiral Halo{2-[1-(S)-(dimethylamino)ethyl]phenyl-C1,N}mercury(II) Complexes
作者:Saeed Attar、John H. Nelson、Jean Fischer
DOI:10.1021/om00010a045
日期:1995.10
The reaction of HgCl2 with enantiomerically pure o-lithio-(S)-(-)-dimethyl(1-phenylethyl)amine, (S)-ArLi, results in good yields of (S)-HgCl[C6H4CH(Me)NMe(2)]}, 2a. The bromide (2b) and iodide (2c) analogs were prepared by metathetic reactions of 2a with NaBr and NaI, respectively. Single-crystal X-ray crystallographic data on all three complexes show that the Hg atom in each is nonplanar with three different groups bonded to it, making it a stereocenter. Thus, with the chiral benzylic carbon of the chelating amine ligand having the (S) absolute configuration, these complexes form as only the (S)(C)(R)(Hg) diastereomers.