From the Lithium-2-anilide-2-fluoro-1,3-diaza-2-sila-cyclopentene-GaCl3-adduct to 1,4,6-Triaza-5-gallium-7-sila-cyclo-3-heptene- Experimental and Quantum-chemical Results

Andreas Fischer (1) , Daniel Stern (1) , Andrea Thorn (1) , Sascha Abraham (2) , Dietmar Stalke (1) , Uwe Klingebiel (3)

1 Inorganic Chemistry
2 Physical Chemistry
3 Inorganic Chemistry

The lithium salt (HC-NCMe3)2SiFNLiR 1 R = C6H3(2,6-CHMe2)2 reacts with trichlorogallium under displacement of the lithium ion by GaCl3 to give the adduct [(HC-NCMe3)2SiFN]- [(GaCl3)R•Li(thf)4]+ 1. Thermally 1 loses LiCl forming the bicyclic ring intermediates V and VI. VI adds the aniline H2NC6H3(2,6-CHMe2)2 and the unsaturated, seven-membered ring compound (-NCMe3-CH2-CH=NCMe3GaCl2-NR-SiFNHR-) 2 is obtained. The addition is accompanied by an enamine-imine-tautomerism and proves the Lewis acid character of the silicon atom in an unknown 3-center-2-electron interaction of one nitrogen atom with the silicon and gallium atoms. Quantum chemical calculations of the thermal isomerisation process and crystal structures of 1 and 2 are reported.

Mots clés: Physical Sciences

Andreas Fischer, Daniel Stern, Andrea Thorn, Sascha Abraham, Dietmar Stalke, et al.. From the Lithium-2-anilide-2-fluoro-1,3-diaza-2-sila-cyclopentene-GaCl3-adduct to 1,4,6-Triaza-5-gallium-7-sila-cyclo-3-heptene- Experimental and Quantum-chemical Results. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2010, 636 (8), pp.1527. ⟨10.1002/zaac.201000041⟩. ⟨hal-00552449⟩