8-Amidoquinoline, 8-(Trialkylsilylamido)quinoline, 2-Pyridylmethylamide, and (2-Pyridylmethyl)(trialkylsilyl)amide Complexes of Gallium†
Christian Koch
Jena, Friedrich-Schiller-Universität, Institute of Inorganic and Analytical Chemistry
Search for more papers by this authorHelmar Görls
Jena, Friedrich-Schiller-Universität, Institute of Inorganic and Analytical Chemistry
Search for more papers by this authorCorresponding Author
Matthias Westerhausen Prof. Dr.
Jena, Friedrich-Schiller-Universität, Institute of Inorganic and Analytical Chemistry
Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-Universität, August-Bebel-Str. 2, D-07743 Jena / Germany, Fax: +49 (0) 3641 948110Search for more papers by this authorChristian Koch
Jena, Friedrich-Schiller-Universität, Institute of Inorganic and Analytical Chemistry
Search for more papers by this authorHelmar Görls
Jena, Friedrich-Schiller-Universität, Institute of Inorganic and Analytical Chemistry
Search for more papers by this authorCorresponding Author
Matthias Westerhausen Prof. Dr.
Jena, Friedrich-Schiller-Universität, Institute of Inorganic and Analytical Chemistry
Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-Universität, August-Bebel-Str. 2, D-07743 Jena / Germany, Fax: +49 (0) 3641 948110Search for more papers by this authorDedicated to Professor Heinrich Nöth on the Occasion of his 80th Birthday
Abstract
Lithium 8-amidoquinoline (1) and lithium 8-(trialkylsilylamido)quinoline [SiMe2tBu (2), SiiPr3 (3)] react with dimethylgallium chloride to the metathesis products dimethylgallium 8-amidoquinoline (4) as well as dimethylgallium 8-(trialkylsilylamido)quinoline [SiMe2tBu (5), SiiPr3 (6)]. The gallium atoms are in distorted tetrahedral environments. During the synthesis of 5, orange dimethylgallium 2-butyl-8-(tert-butyldimethylsilylamido)quinoline (7) was found as by-product. The metathesis reactions of Me2GaCl with LiN(R)CH2Py (Py = 2-pyridyl) yield the corresponding 2-pyridylmethylamides Me2Ga-N(H)CH2Py (8), Me2Ga-N(SiMe2tBu)CH2Py (9) and Me2Ga-N(SiiPr3)CH2Py (10). In these complexes the gallium atoms show a distorted tetrahedral coordination sphere. However, derivative 8 crystallizes dimeric with bridging amido units whereas in 9 and 10 the 2-pyridylmethylamido moieties act as bidentate ligands leading to monomeric molecules.
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