Reactions of the borole complex CpRh(η5-C4H4BPh) with monocationic organometallic fragments
摘要:
The B-phenylborole complex CpRh(eta(5)-C4H4BPh) (1) reacts with [ML](+) fragments to give the arene-type cationic complexes [CpRh(mu-eta(5):eta(6)-C4H4BPh) ML](+) (ML = RuCp* (3), Co(C4Me4) (4), Rh(cod) (5), and Ir(cod) (6)). Cation 4 undergoes a reversible rearrangement into the triple-decker complex [CpRh(mu-eta(5):eta(5)-C4H4BPh) Co(C4Me4)](+) (7) under visible light irradiation in CH2Cl2 solution. DFT calculations revealed greater stability of arene-type complexes over triple-decker isomers. The structure of [3] BF4 was determined by X-ray diffraction. (C) 2007 Elsevier B. V. All rights reserved.