Barbara Reiter

Komplexchemie reaktiver organischer verbindungen : IX. Einbau von methylen in mangan-komplexe

Cyclopentadienyl- and methylcyclopentadienyltetrahydrofuranedicarbonylmanganese behave with respect to diazomethane as carbene trapping reagents. The reactions carried out at low temperatures yield diamagnetic dimeric complexes of the type [RC5H4Mn(CO)2]2CH2 (R = H and CH3, respectively), which contain, as shown by their spectroscopic data, a CH2-bridging ligand as characteristic structural element. In addition to the μ-methylidene compounds the π-ethylene complexes RC5H4Mn(CO)2(C2H4) are formed.

Übergangsmetall—methylen-komplexe: XXIV. Carben-addition an eine co??co-bindung

Zusammenfassung Carbene transfer from the diazoalkane precursors IIa–IIf to the formal metal—metal double bond of the dinuclear cobalt complex [(η5-C5Me5)Co-(ν-C0)]2 (I) (Me  CH3) occurs rapidly in the temperature range from -40 to +60°C to give the dimetallacyclopropane-type μ-methylene derivatives IIIb–IIIe, IVa, and Vf, respectively.

Verbesserte synthesen von phenyltrisilanen

Improved syntheses for the trisilanes (PhH2Si)2SiHPh, (PhH2SiH2and (Ph2HSi)2SiPh2 are reported. The preparation of (Ph2HSi)22SiH2 and Ph2HSiSiH2SiH2Ph is described for the first time. When octaphenyltrisilane, 2-chloro-1,1,1,3,3,3- hexaphenyltrisilane or 1,1,1,3,3,3-hexaphenyltrisilane react with liquid hydrogen chloride or triflic acid (CF3SO3H), trisilanes (PhCl 2Si)2SiClPh, (PhCl2Si)2SiHCl, (Ph2TfSi)2SiPh2 (Tf = CF3SO3), (Ph2TfSiSiH2 and Ph2TfSiSiH2 SiPhTf2 are formed which are easily reduced to the title compounds using LiAlH4.

Thermische disproportionierung von (η5-C5H5)2V2(CO)5. Tetrakis[carbonyl(η5-cyclopentadienyl)vanadium], (η5-C5H5)4V4(CO)4

Abstract The novel vanadium cluster tetrakis[carbonyl(η 5 -cyclopentadienyl)- vanadium has been prepared in 32% yield by thermal disproportionation of μ-dicarbonyltricarbonylbis(η 5 -cyclopentadienylvanadium) (V-V) in boiling tetrahydrofuran.