Abstract
The synthesis and reactivity of a bulky bis(phosphinimine)carbazole pincer ligand (HL) bearing mesityl N-aryl groups is described. Reaction of HL with Y(CH2SiMe3)3(THF)2 afforded a doubly cyclometalated organoyttrium complex, whereby the ligand was κ3N, κ2C coordinated to the metal via three nitrogen atoms and two ortho-metalated P-phenyl rings. Deprotonation of (HL) with nBuLi liberated a monomeric and thermally stable lithium salt of the ligand (LLi). Salt metathesis reactions of LLi with ScCl3(THF)3 and YCl3(THF)3.5 generated the corresponding rare earth dichloro complexes, which were found to be monomeric and Lewis-base free.
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