M. Paas, B. Wibbeling, R. Fröhlich
2006
Citations
0
Influential Citations
30
Citations
Journal
European Journal of Inorganic Chemistry
Abstract
Silver(I) complexes of the freely stable carbenes 1,3-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene (3) and 1,3-bis(2,6-diisopropylphenyl)imidazolidin-2-ylidene (4) were prepared from the imidazolinium chlorides 1 and 2, respectively, and silver oxide. These two air-stable and light-sensitive carbene complexes [AgCl(3)] (5) and [AgCl(4)] (6) were characterized by NMR spectroscopy, and the molecular structure of 6 was confirmed by X-ray diffraction. The imidazolidin-2-thiones 7 and 8 were obtained by reaction of the silver carbene complexes 5 and 6, respectively, with elemental sulfur at ambient temperature. Spectroscopic evidence for the formation of the rhodium(I) complex [(cod)Rh(Cl)(10)] (11) with the sterically demanding 1,3-di-tert-butyl-imidazolidin-2-ylidene ligand 10 obtained in situ from 1,3-di-tert-butyl-imidazolinium tetrafluoroborate 9 is presented. Because of the steric demand of the carbene ligand 10, complex 11 decomposed rapidly in solutions of chlorinated or polar solvents.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)