| | 2 | Author
| Christoph Kümmel, Anton Meller, Mathias Noltemeyer | Requires cookie* | | | Title
| Intramolekular-stabilisierte Organogallium-und -indiumhalogenide. Ein erstes neutrales Indiumhydrid Intramolecularly Stabilized Organogallium-and -indium Halides. A First Neutral Indium Hydride  | | | | Abstract
| The intramolecularly coordinating 2-(dimethylaminomethyl)phenyl-(X) and 4-terr-butyl-2,6-bis(dimethylaminomethyl)phenyl-(Y) ligands were employed in the preparation of the gallium and indium halides: X2InI (B), XInI2 (1), X2InBr (2), XInBr2 (3), XIn(Et)I (4), XGaI2 (6) and YInI2 (7). The first neutral indium hydride X2InH (5) was made in situ from LiInH4 and 2. Z2InCl (8) (Z = 2-pyridyl-bis(trimethylsilyl)methyl), and X3Ga (C) were also synthesized. The compounds are characterized by N. M. R. ('H, 13C, 29Si and for 6 71Ga) and mass spectrometry and elemental analyses or peak matching M. S.. N. M. R.-data are discussed as well as the X-ray structure analyses provided for B, 2, 4, 5, 7 and 8. | | | |
Reference
| Z. Naturforsch. 51b, 209—219 (1996); eingegangen am 13. Juli 1995 | | | |
Published
| 1996 | | | |
Keywords
| Gallium Halides, Indium Halides, Gallium Aryls, Indium Aryls, Aryl Indium Hydride | | | |
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| default:Reihe_B/51/ZNB-1996-51b-0209.pdf | | | | Identifier
| ZNB-1996-51b-0209 | | | | Volume
| 51 | |
| 3 | Author
| Marcus Sigl, Annette Schier, Hubert Schmidbaur | Requires cookie* | | | Title
| Lewis Acid Catalyzed Z to E Isomerization of 1,2-Bis(diphenyl- phosphino)ethene | | | | Abstract
| Z-l,2-Bis(diphenylphosphino)ethene, cis-Ph2PCH=CHPPh2, forms 1:2 adducts with GaBn and GaL, the former of which has been identified in an X-ray diffraction study as the complex of the isomerized ligand, E-Ph2PCH=CHPPh2. The GaL complex is believed to be analogous on the basis of analytical and spectroscopic data. InBr3 affords a 1 :1 complex with an ionic structure [(Ph2PCH=CHPPh2)2lnBr2]+ [InBr4]_ in which the cation contains the original cis-ligand. With Inl^ also a 1:1 adduct is obtained, where the metal triiodide unit is attached to only one phosphorus atom of the non-isomerized (cis) ligand in the solid state. There is rapid site exchange of the Inl3 unit in chloroform solution as followed by NMR spectroscopy. -The metal halide induced Z/E isomerization of Ph2PCH=CHPPh2 has been studied in various solvents and at variable temperature with stoichiometric and catalytic amounts of AIX3 and GaX3 Lewis-acids. InX3 compounds proved ineffective (X = Cl, Br, I). Anhydrous AlBr3 was found to be most efficient, giving a 90% Z/E conversion in 10 min at 100°C in toluene. A mechanism is proposed which is compatible with the experimental data. | | | |
Reference
| Z. Naturforsch. 53b, 1301—1306 (1998); received August 13 1998 | | | |
Published
| 1998 | | | |
Keywords
| Z/E Isomerization, Phosphino-Ethenes, Lewis Acid Catalysis, Gallium Halides, Aluminium Halides, Indium Halides | | | |
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| default:Reihe_B/53/ZNB-1998-53b-1301.pdf | | | | Identifier
| ZNB-1998-53b-1301 | | | | Volume
| 53 | |
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