Neutral and cationic enantiopure group 13 iminophosphonamide complexes

Abstract

Synthesis and reactivity of enantiopure iminophosphonamide ligand L-H (L = [Ph₂P{N(R)CH(CH₃)Ph}₂]) with group 13 metal compounds has been investigated. The reaction of L-H with LiAlH₄ afforded the aluminium monohydride complex [L₂AlH]. The monochloride complexes [L₂MCl] (M = Al, Ga) were accessed by reacting corresponding MCl₃ (M = Al, Ga) with L-Li. Furthermore, the tetracoordinated aluminium cation [L₂Al]⁺[GaCl₄]⁻ and gallium cation [L₂Ga]⁺[AlCl₄]⁻ were obtained by chloride abstraction from [L₂MCl] (M = Al, Ga), respectively. The title complexes represent the first examples of enantiopure group 13 metal complexes coordinated by chiral iminophosphonamides. All complexes have been characterized by single crystal X-ray diffraction, multinuclear NMR, EA and IR studies.