Monoalkyl and monoanilide yttrium complexes containing tridentate pyridyl-1-azaallyl dianionic ligands.
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(CH(2)SiMe(3))(3)(THF)(2) and HL4 or HL5 gave the monoalkyl complexes (L4-H)YCH(2)SiMe(3)(THF) (1) and (L5-H)YCH(2)SiMe(3)(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-((i)Pr)(2)C(6)H(3)), via highly selective protonolysis of the terminal alkyl Y-CH(2)SiMe(3) bond. Complexes 1-4 are active for intramolecular hydroamination of aminoalkenes.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China.
Erli
E
Lu
Wei
W
Gan
Yaofeng
Y
Chen