Benzylgalliumverbindungen. Koordination von Benzylliganden in Cs[(PhCH 2 ) 2 GaF 2 ]

Benzylgallium Compounds. Coordination of Benzyl Ligands in Cs[(PhCH 2 ) 2 GaF 2 ] Dissolving (PhCH 2 ) 3 Ga ( 1 ) in THF yields the complex [(PhCH 2 ) 3 Ga · THF] ( 2 ). Reaction of 1 with dry oxygen in toluene at –78°C leads to [(PhCH 2 ) 2 GaOCH 2 Ph] 2 ( 3 ), which is also formed from 1 and PhCH 2 OH. The salts K[(PhCH 2 ) 2 GaF 2 ] ( 5 ) and Cs[(PhCH 2 ) 2 GaF 2 ] ( 6 ) were obtained from (PhCH 2 ) 2 GaCl ( 4 ) and KF or CsF, respectively, in acetonitrile. Crystal structures were determined for 2, 3, 6 and {[(PhCH 2 ) 2 GaCl] 2 · toluene} ( 7 ). Gallane 2 is a chiral monomeric complex in the solid state. The benzyl substituents create a propeller‐shaped molecule with a counterclock‐wise orientation of the ligands. 3 and 7 are crystallizing as centrosymmetrical dimers with Ga 2 X 2 rings (X=O, Cl). 6 consists in infinite chains of {Cs[(PhCH 2 ) 2 GaF 2 ]} 2 units with Cs–F contacts. In addition to the Cs–F interaction, the coordination of each Cs + ion by two phenyl rings in a η 6 ‐ fashion is observed.