Reactivity, Structures, and NMR Spectroscopy of Half-Sandwich Pentamethylcyclopentadienyl Rhodium Amido Complexes Relevant to Transfer Hydrogenation
作者:A. John Blacker、Simon B. Duckett、Jake Grace、Robin N. Perutz、Adrian C. Whitwood
DOI:10.1021/om8009969
日期:2009.3.9
reaction with tBuNC gave [Cp*Rh(CNtBu)(S,S-TsCHPhCHPhNH2)][PF6] (4a), and reactions with LiBr and KI gave Cp*RhBr(S,S-TsNCHPhCHPhNH2) (6a) and Cp*RhI(S,S-TsNCHPhCHPhNH2) (7a), respectively. Complexes S,S-2c, S,S-6a, and S,S-7a have been characterized by X-ray crystallography; the amino N−Rh bond is significantly shorter than the amido N−Rh bond in all cases (difference Δr 0.058(2), 0.085(6), and 0.046(4)
的反应性,结构和NMR的一系列相关的不对称转移氢化通式的Cp *的RhCl的,化合物的光谱(S,S -4-RC 6 H ^ 4 SO 2 NCHPhCHPhNH 2)(CP * =η 5 -C 5 Me 5,S,S - 2a R = Me,S,S - 2b R = t Bu,S,S - 2c R = F)。用15记录2a - 2c的1 H / 15 N HMQC NMR光谱利用与C 5 Me 5质子的耦合,自然丰度中的N ;耦合常数J RhN约为。氨基和酰胺基氮分别为15和20 Hz。相似地记录2a和2c的1 H / 103 Rh NMR谱。S,S - 2a中的氯配体非常不稳定。与CO反应,得到阳离子复合物[Cp * Rh(CO)C(O)N(Ts)CHPhCHPhNH 2 }] [Cl](3a),为非对映体S,S,R Rh和S,S的混合物,小号的Rh,在Rh处具有相反的手性;与t BuNC反应得到[Cp