118227-84-2Relevant academic research and scientific papers
Triple-Decked Complexes, V. - The Mechanism of the Nucleophilic Degradation of μ5-(1-Phenylborole)bis5-(1-phenylborole)rhodium>
Herberich, Gerhard E.,Bueschges, Ulrich
, p. 615 - 620 (2007/10/02)
Reversible nucleophilic degradation of the triple-decked complex Rh2(C4H4BPh)3 (1) with small and basic phosphanes (e.g.PEt3) and amines (e.g.NH3) L produces salts (4) while bulky and/ or less basic nucleophiles (e.g.PiPr3, PCl3 and NHEt2, PhNH2) do not react.The hybrido complex (C4H4BPh)Rh (5) is formed in the system 1/NH3/NMe4Cl/K.The nucleophilic degradation follows a second-order rate law, being first-order in both 1 and L; activation parameters and equilibrium constants were determined for L = PMe3, PEt3 and P(OMe)3.An associative mechanism is proposed.The rate-determining step is a lateral nucleophilic attack at one of the metal centres with concomitant slippage from η5- to η3-bonding; this is then followed by fast addition of two further ligand molecules. - Keywords: Triple-decker complexes/ Nucleophilic degradation/ 1H-Borole/ (1-Phenylborole)rhodium complexes
