benzyliminium tetraphenylborate 、 [HPd(1,2-bis(diphenylphosphino)ethane)2]CF3SO3*0.125tetrahydrofuran 以
not given 为溶剂,
生成 [Pd(1,2-bis(diphenylphosphino)ethane)2](CF3SO3)(B(C6H5)4)
Reactivity of ammonium and iminium tetraphenylborates towards Pd(0)-complexes: selective allyl or proton transfer to Pd(0).
作者:Michele Aresta、Eugenio Quaranta
DOI:10.1016/s0022-328x(02)01897-1
日期:2002.11
The reactivity of ammonium- and iminium-BPh4 Salts, [CH2=CHCH2NH3]BPh4, [(CH2=CHCH2)HN=CMe2]BPh4 and [(PhCH2)HN=CMe2]BPh4, towards Pd(0)-complexes, [Pd(dppe)(dba)] and [Pd(dppe)(2)] (dppe = 1,2-bis(diphenylphosphino)ethane; dba = dibenzylideneacetone), has been investigated. Allyl-ammonium and -iminium tetraphenylborates [CH2=CHCH2NH3]BPh4 and [(CH2=CHCH2)HN=CMe2]BPh4 react with [Pd(dppe)(dba)] to afford, under mild conditions (293 K), [(eta(3)-C3H5)Pd(dppe)][BPh4], through selective oxidative transfer of allyl group from the ammonium or iminium cation to the Pd center. [(PhCH2)HN CMe2]BPh4 reacts with [Pd(dppe)(2)] to afford [H-Pd(dppe)(2)][BPh4], that, under the reaction conditions, has poor stability as it undergoes hydride transfer to the iminium ion present in the reaction medium, affording [Pd(dppe)(2)][BPh4](2). (C) 2002 Elsevier Science B.V. All rights reserved.
Oxidative Addition of Ammonium and Iminium Tetraphenylborates to Low-Valent Metal Complexes. Evidence of Selective N−C and N−H Activation. A New, Easy Route to Cationic Allyl- and Hydridonickel Complexes
The reaction of ammonium and iminium tetraphenylborate salts ((CH2CHCH2NH3)BPh4, [(CH2CHCH2)HNCMe2]BPh4, and [(PhCH2)HNCMe2]BPh4) with transition-metal systems in a low oxidation state has been investigated. We report the oxidative addition to (Cy3P)2Ni(η2-CO2) or (Cy3P)2NiN⋮NNi(PCy3)2 under mild conditions (253−293 K) and describe a very selective NC or NH bond activation. (CH2CHCH2NH3)BPh4 or [(
Synthesis, Characterization, and Reactivity of Cationic Hydride [HPd(diphosphine)<sub>2</sub>]<sup>+</sup>CF<sub>3</sub>SO<sub>3</sub><sup>-</sup>, the Missing Member of the Family [HM(dppe)<sub>2</sub>]<sup>+</sup>X<sup>-</sup> (M = Ni, Pd, Pt). DFT QM/MM Structural Predictions for the [HPd(dppe)<sub>2</sub>]<sup>+</sup> Moiety
The synthesis, characterization, and properties of the cationic hydride [HPd(dppe)(2)](+)CF(3)SO3(-).1/8THF, the missing member of the family [HM(dppe)(2)](+)X(-) (M = Ni, Pd, Pt), are described. The Pd hydride is not stable in solution and may react as either a proton or a hydride donor. DFT QM/MM calculations of the [HPd(dppe)(2)](+) moiety have allowed us to predict its structure and reactivity