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Synthesis, Structural Characterisation and Stereochemical Investigation of Chiral Sulfur‐Functionalised N‐Heterocyclic Carbene Complexes of Palladium and Platinum
Author(s) -
Krishnan Deepa,
Pullarkat Sumod A.,
Wu Meiyi,
Li Yongxin,
Leung PakHing
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201204320
Subject(s) - palladium , stereocenter , carbene , chemistry , platinum , chelation , ring (chemistry) , sulfur , ligand (biochemistry) , stereochemistry , nuclear magnetic resonance spectroscopy , asymmetric carbon , organic chemistry , catalysis , enantioselective synthesis , optically active , biochemistry , receptor
Palladium and platinum complexes containing a sulfur‐functionalised N‐heterocyclic carbene (S‐NHC) chelate ligand have been synthesised. The absolute conformations of these novel organometallic S‐NHC chelates were determined by X‐ray structural analyses and solution‐phase 2D 1 H– 1 H ROESY NMR spectroscopy. The structural studies revealed that the phenyl substituents on the stereogenic carbon atoms invariably take up the axial positions on the Pd‐C‐S coordination plane to afford a skewed five‐membered ring structure. All of the chiral complexes are structurally rigid and stereochemically locked in a chiral ring conformation that is either ( R s , S , R )‐λ or ( S s , R , R )‐δ in both the solid state and solution.