Aerobic Oxidation Reactions Catalyzed by Vanadium Complexes of Bis(Phenolate) Ligands
作者:Guoqi Zhang、Brian L. Scott、Ruilian Wu、L. A. “Pete” Silks、Susan K. Hanson
DOI:10.1021/ic3007525
日期:2012.7.2
afforded the monomeric vanadium(IV) product (BPP)VIV(O)(HOiPr) (6) and acetone. Vanadium(IV) complex 6 was oxidized rapidly by air at room temperature in the presence of NEt3, yielding the vanadium(V) cis-dioxo complex [(BPP)VV(O)2]HNEt3. Complex (BPA)VV(O)(OiPr) (5) reacted with pinacol at room temperature, to afford acetone and the vanadium(IV) dimer [(BPA)VIV(O)(HOiPr)]2. Complexes 4 and 5 were evaluated
三齿双(酚盐)吡啶配体H 2 BPP(H 2 BPP = 2,6-(HOC 6 H 2 -2,4- t Bu 2)2 NC 5 H 3)和bis(酚盐)胺配体H 2 BPA(H 2 BPA = N,N-双(2-羟基-4,5-二甲基苄基)丙胺)已经合成并表征。测试了复合物介导频哪醇的氧化性CC键裂解的能力。络合物(BPP)V V(O)(O iPr(4)与频哪醇一起提供单体钒(IV)产物(BPP)V IV(O)(HO i Pr)(6)和丙酮。钒(IV)络合物6在室温下在NEt 3的存在下被空气快速氧化,生成钒(V)顺式-二氧杂合物[(BPP)V V(O)2 ] HNEt 3。络合物(BPA)V V(O)(O i Pr)(5)在室温下与频哪醇反应,得到丙酮和钒(IV)二聚体[(BPA)V IV(O)(HO i Pr)] 2。配合物4将5和5评估为4-甲氧基苄醇和芳基甘油β-芳基醚木质素模型化合物