Reactivity of a trinuclear ruthenium complex involving C–H activation and insertion of alkene

摘要: A novel pyridyl-substituted indenyl trinuclear ruthenium complex, {μ2-η5:η1-(C5H3N-6-Br)(C9H5)}Ru3(CO)9 (1), was synthesized by thermal treatment of 1-(6-bromo-2-pyridyl)indene with Ru3(CO)12 (1 : 1 mol ratio) in refluxing heptane and its reactivity pyridine derivatives, toluene, indene, fluorene, phenylethylene divinylbenzene studied. The reaction 1 5-fold excess gave two products, complex {η5-(C5H3N-6-Br)(C9H5)}{η1-(C5H3N)(C9H6)}Ru2(CO)4 (2) substituted dibenzfulvalene (3). Reaction toluene afforded an unexpected {μ3-η6:η3:η1-(C5H3N-6-Br)(C9H5)}Ru3(CO)7 (4), via the loss CO groups. indene a known [{(η5-C9H7)Ru(CO)2}2] (5). fluorene not involved reaction, indicating that is low. reactions or dinuclear complexes {η5-(C5H3N-6-Br)(C9H5CHCH2Ph)}Ru2(CO)5 (6) {η5-(C5H3N-6-Br)(C9H5CHCH2PhCHCH2)}Ru2(CO)5 (7), respectively. These have been characterized elemental analysis, IR, 1H NMR spectroscopy. molecular structures 1–6 were determined X-ray diffraction. density functional theoretical calculations on electronic structure give illustration to high reactivity.