Reduction of [NMe4]2[ReBr5(NO)] (1) with zinc in acetonitrile leads to the known trisacetonitrile... more Reduction of [NMe4]2[ReBr5(NO)] (1) with zinc in acetonitrile leads to the known trisacetonitrile compound [ReBr2(CH3CN)3(NO)] (2). Attempts to turn 2 into a dihydrogen or a hydride complex applying direct reaction with H2 or with H2 and a base were unsuccessful. Complex 2 could be transformed into [ReBr(BF4)mer-(CH3CN)3(NO)] (2a) with AgBF4 in acetonitrile and was used as a starting material in
The re-investigation of four original tris-bridged dinuclear dicobalt complexes from the Werner c... more The re-investigation of four original tris-bridged dinuclear dicobalt complexes from the Werner collection of the University of Zurich by X-ray diffraction studies is described. The complex [Co2(NH3)6(μ-NH2) (μ-OH)(μ-O2)](NO3)3 was studied recently. As the most interesting feature it was found to contain a μ-superoxo bridge, recognized by Alfred Werner and his coworker as an asymmetric peroxo bridge. The newly established μ-mono- and diacetato structures from crystals of the Werner collection, [Co2(NH3)6(μ-OH)2(μ-O2CMe)](NO3)3·H2O and [Co2(NH3)6(μ-OH)(μ-O2CMe)2](NO3)3·H2O, were assigned by Alfred Werner and his co-workers as mono- or di-bridged systems with the water functioning as η(1)-aqua ligands and not, as revealed by the X-ray diffraction studies, as solvate molecules. Similarly the exact nature of the μ(N, O) nitrito bridge in the structure of the [Co2(NH3)6(μ-OH)2(μ-O2N)](NO3)3·H2O complex from the Werner collection was left open in Werner's and his coworker's descri...
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The Arduengo carbenes 1,3-diisopropyl-, 1-methyl-3-(1-methylpropyl)-, and 1-methyl-3-(2,4,6-trime... more The Arduengo carbenes 1,3-diisopropyl-, 1-methyl-3-(1-methylpropyl)-, and 1-methyl-3-(2,4,6-trimethylbenzyl)imidazol-2-ylidene (3a–c) were reacted with MCl4(thf)2 (M=Zr, Hf) to yield the respective trans-(imidazol-2-ylidene)MCl4 complexes 4a–c (M=Zr) and 5a (M=Hf), respectively. These four Arduengo carbene-Group 4 metal halide complexes were characterized by X-ray diffraction. The pairs of carbene ligands are trans-positioned in a pseudo-octahedral coordination geometry at the Group 4 metals, and adopt a conformational
Nucleophilic attack of sodium isopropylthiolate on 4,4-dichloro-1,1-diphenyl-2-azabuta-1,3-diene ... more Nucleophilic attack of sodium isopropylthiolate on 4,4-dichloro-1,1-diphenyl-2-azabuta-1,3-diene [Cl2CC(H)–NCPh2}] (1) affords the 2-azabutadiene derivative [(i-PrS)2CC(H)–NCPh2] (2). Upon irradiation of Mo(CO)6 in THF in the presence of 2, the chelate complex cis-[(OC)4Mo{(i-PrS)2CC(H)–NCPh2}] (3) is obtained. Coordination on Mo occurs through the imine nitrogen and a thioether group. Polydentate dithioether 2 acts as N,C,S-pincer ligand after orthometallation reaction with Pd(II) or Pt(II). The molecular structures of 2 and (C,N,S)-[(i-PrS)2CC(H)–NC(Ph)C6H4)PtCl] (4b) have been determined by X-ray diffraction studies.
Reduction of [NMe4]2[ReBr5(NO)] (1) with zinc in acetonitrile leads to the known trisacetonitrile... more Reduction of [NMe4]2[ReBr5(NO)] (1) with zinc in acetonitrile leads to the known trisacetonitrile compound [ReBr2(CH3CN)3(NO)] (2). Attempts to turn 2 into a dihydrogen or a hydride complex applying direct reaction with H2 or with H2 and a base were unsuccessful. Complex 2 could be transformed into [ReBr(BF4)mer-(CH3CN)3(NO)] (2a) with AgBF4 in acetonitrile and was used as a starting material in
The re-investigation of four original tris-bridged dinuclear dicobalt complexes from the Werner c... more The re-investigation of four original tris-bridged dinuclear dicobalt complexes from the Werner collection of the University of Zurich by X-ray diffraction studies is described. The complex [Co2(NH3)6(μ-NH2) (μ-OH)(μ-O2)](NO3)3 was studied recently. As the most interesting feature it was found to contain a μ-superoxo bridge, recognized by Alfred Werner and his coworker as an asymmetric peroxo bridge. The newly established μ-mono- and diacetato structures from crystals of the Werner collection, [Co2(NH3)6(μ-OH)2(μ-O2CMe)](NO3)3·H2O and [Co2(NH3)6(μ-OH)(μ-O2CMe)2](NO3)3·H2O, were assigned by Alfred Werner and his co-workers as mono- or di-bridged systems with the water functioning as η(1)-aqua ligands and not, as revealed by the X-ray diffraction studies, as solvate molecules. Similarly the exact nature of the μ(N, O) nitrito bridge in the structure of the [Co2(NH3)6(μ-OH)2(μ-O2N)](NO3)3·H2O complex from the Werner collection was left open in Werner's and his coworker's descri...
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The Arduengo carbenes 1,3-diisopropyl-, 1-methyl-3-(1-methylpropyl)-, and 1-methyl-3-(2,4,6-trime... more The Arduengo carbenes 1,3-diisopropyl-, 1-methyl-3-(1-methylpropyl)-, and 1-methyl-3-(2,4,6-trimethylbenzyl)imidazol-2-ylidene (3a–c) were reacted with MCl4(thf)2 (M=Zr, Hf) to yield the respective trans-(imidazol-2-ylidene)MCl4 complexes 4a–c (M=Zr) and 5a (M=Hf), respectively. These four Arduengo carbene-Group 4 metal halide complexes were characterized by X-ray diffraction. The pairs of carbene ligands are trans-positioned in a pseudo-octahedral coordination geometry at the Group 4 metals, and adopt a conformational
Nucleophilic attack of sodium isopropylthiolate on 4,4-dichloro-1,1-diphenyl-2-azabuta-1,3-diene ... more Nucleophilic attack of sodium isopropylthiolate on 4,4-dichloro-1,1-diphenyl-2-azabuta-1,3-diene [Cl2CC(H)–NCPh2}] (1) affords the 2-azabutadiene derivative [(i-PrS)2CC(H)–NCPh2] (2). Upon irradiation of Mo(CO)6 in THF in the presence of 2, the chelate complex cis-[(OC)4Mo{(i-PrS)2CC(H)–NCPh2}] (3) is obtained. Coordination on Mo occurs through the imine nitrogen and a thioether group. Polydentate dithioether 2 acts as N,C,S-pincer ligand after orthometallation reaction with Pd(II) or Pt(II). The molecular structures of 2 and (C,N,S)-[(i-PrS)2CC(H)–NC(Ph)C6H4)PtCl] (4b) have been determined by X-ray diffraction studies.
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