Methylene-Linked Anilide—Bis(aryloxide) Ligands: Lithium, Sodium, Potassium, Chromium(III), and Vanadium(III) Ligation
作者:Yutaka Ishida、Hiroyuki Kawaguchi
DOI:10.1021/ic5005853
日期:2014.7.7
The anilide–bis(aryloxide) proligands H3[ONOR] (where H3[ONOR] = 2,6-(3-R1-5-R2-2-hydroxybenzyl)-4-tert-butyl-N-tolyl-aniline; H3[ONOtBu], R1 = tBu, R2 = Me; H3[ONOMe], R1 = Me, R2 = tBu; H3[ONOMe2], R1 = R2 = Me) were synthesized from 2-bromo-5-tert-butyl-isophthalic acid dimethyl ester in three steps in multigram scale. The ligand precursor H3[ONOtBu] was readily doubly and triply deprotonated with
N-酰苯胺双(芳氧基)前配体ħ 3 [ ONO - [R ](其中H 3 [ ONO - [R ] = 2,6-(3-R 1 -5-R 2 -2羟基苄基)-4-叔丁基- Ñ -甲苯基苯胺; H 3 [ ONO t Bu ],R 1 = t Bu,R 2 = Me; H 3 [ ONO Me ],R 1 = Me,R 2 = t Bu; H 3 [ ONO Me2 ],R 1 = R 2由2-溴-5-叔丁基间苯二甲酸二甲酯以三克数级合成。配体前体H 3 [ ONO t Bu ]容易被碱金属试剂双重和三次去质子化,生成相关的衍生物M 2 [H(ONO t Bu)]和M 3 [ ONO t Bu ](M = Li,Na, K)。观察到配体去质子化的程度取决于去质子化试剂和溶剂的选择。三锂衍生物Li 3 [ ONO t Bu ]与MCl 3的金属转移反应(THF)3(M = Cr,V; THF =四氢呋喃)得到[(ONO