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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Structure, and Catalytic Activity of μ-Alkylthio- and μ-Arylthio-μ-chloro-dicarbonylbis(tri-tert-butylphosphane)dirhodium Complexes1)Tetracarbonyldi-μ-chloro-dirhodium (1) reacts with tri-tert-butylphosphane and alkyl or aryl trimethylsilyl sulfides 4 to give complexes [Rh2(CO)2(PtBu32Cl(SR)] (5a  -  i). The complexes 5h, i with the surface active trialkoxysilyl groups [R = (EtO)3SiCH2CH2, (MeO)3SiCH2CH2CH2] are fixed onto a fused silica support. The X-ray structural analyses of [Rh2(CO)2(PtBu3)2Cl(StBu)] (5c) and [Rh2(CO)2(PtBu3)2Cl(SC6H4Cl)] (5g) indicate a cis-configuration of the tri-tert-butylphosphane ligands. The new complexes catalyze the isomerization of 1-octen-3-ol (10) into 3-octanone (11), of 4-allylanisole (12) into cis- and trans-4-(1-propenyl)anisole (13), of trans-stilbene oxide (14) into desoxybenzoin (15), the transfer hydrogenation of α,β-unsaturated ketones by formic acid (16 → 17), and the transfer hydrogenolysis of trihalomethyl compounds (18, 20) by halogen free alcohols.
    Notes: Durch Umsetzung von Tetracarbonyldi-μ-chloro-dirhodium (1) mit Tri-tert-butylphosphan und Alkyl- sowie Aryl(trimethylsilyl)sulfiden 4 werden die Komplexe [Rh2(CO)2(PtBu3)2Cl(SR)] (5a  -  i) dargestellt. Die Komplexe 5h, i mit den oberflächenaktiven Trialkoxysilylgruppen [R = (EtO)3SiCH2CH2, (MeO)3SiCH2CH2CH2] werden auf Silicagel fixiert. Die Röntgenstrukturanalysen von [Rh2(CO)2(PtBu3)2Cl(StBu)] (5c) und [Rh2(CO)2(PtBu3)2Cl(SC6H4Cl)] (5g) zeigen das Vorliegen von cis-konfigurierten Tri-tert-butylphosphangruppen. Die neuen Komplexe isomerisieren 1-Octen-3-ol (10) zu 3-Octanon (11), 4-Allylanisol (12) zu cis- und trans-4-(1-Propenyl)-anisol (13), trans-Stilbenoxid (14) zu Desoxybenzoin (15), und sie katalysieren die Übertragungshydrierung von α,β-ungesättigten Ketonen durch Ameisensäure (16 → 17) und von Trichlormethylverbindungen (18, 20) durch halogenfreie Alkohole.
    Additional Material: 2 Ill.
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  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Structure, and Catalytic Activity of μ-(Alkylthio)-dicarbonyl-μ-chloro-bis(tri-tert-butylarsane)dirhodium ComplexesTetracarbonyl-di-μ-chloro-dirhodium (1) reacts with tri-tert-butylarsane (2) and alkyl trimethylsilyl sulfides (4) to give complexes [Rh2(CO)2(AstBu3)2Cl(SR)] (5a-c). The complexes 5b and c with the surface active trialkoxysilyl groups [R=(MeO)3SiCH2CH2, (MeO)3SiCH2CH2CH2] are bound to fused silica support. The X-ray structural analysis of[Rh2(CO)2(AstBu3)2Cl(StBu)] (5a) indicates a cis-configuration of the tri-tert-butylarsane ligands. The new complexes catalyze the hydroformylation of cyclohexene, and the isomerization of allylbenzene (8) into cis- and trans-β-methylstyrene (9). The soluble complex 5a was shown to be an extremely effective olefin hydrogenation catalyst, whereas the supported complexes 6b and c were completely inactive in this process.
    Notes: Durch Umsetzung von Tetracarbonyl-di-μ-chloro-dirhodium (1) mit Tri-tert-butylarsan (2) und Alkyl(trimethylsilyl)sulfiden (4) werden die Komplexe [Rh2(CO)2(AstBu3)2Cl(SR)] (5a-c) dargestellt. Die Komplexe 5b und c mit Trialkoxysilyl-Gruppen [R=(MeO)3SiCH2CH2, (MeO)3SiCH2CH2CH2] werden auf Silicagel fixiert. Die Röntgenstrukturanalyse von [Rh2(CO)2- (AstBu3)2Cl(StBu)] (5a) zeigt das Vorliegen von cis-konfigurierten Tri-tert-butylarsan-Gruppen. Die neuen Komplexe katalysieren die Hydroformylierung von Cyclohexen und die Isomerisierung von Allylbenzol (8) zu cis- und trans-β-Methylstyrol (9). Während lösliches 5a die Hydrierung von Olefinen katalysiert, sind die Heterogenkatalysatoren 6b und c hierbei völlig inaktiv.
    Additional Material: 3 Ill.
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