Monoalkyl and monoanilide yttrium complexes containing tridentate pyridyl-1-azaallyl dianionic ligands?

Dalton Transactions Pub Date: 2011-01-24 DOI: 10.1039/C0DT01539C

Abstract

A series of pyridyl-1-azaallyl ligand precursors (HL1–HL5) were synthesized via condensation of pyridine ketones with anilines. The alkane elimination reactions between Y(CH2SiMe3)3(THF)2 and HL4 or HL5 gave the monoalkyl complexes (L4–H)YCH2SiMe3(THF) (1) and (L5–H)YCH2SiMe3(THF) (2) supported by new tridentate pyridyl-1-azaallyl dianionic ligands. The reactions of monoalkyl complexes, 1 and 2, with one equivalent of 2,6-diisopropylaniline produced the corresponding monoanilide complexes, (L4–H)YNHAr(THF) (3) and (L5–H)YNHAr(THF) (4) (Ar = 2,6-(iPr)2C6H3), via highly selective protonolysis of the terminal alkyl Y–CH2SiMe3 bond. Complexes 1–4 are active for intramolecular hydroamination of aminoalkenes.

Graphical abstract: Monoalkyl and monoanilide yttrium complexes containing tridentate pyridyl-1-azaallyl dianionic ligands
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