Photochemische reaktionen von übergangsmetall-olefin-komplexen

Metal-Assisted Cycloaddition Reactions in Organotransition Metal Chemistry

“…In a series of papers, Kreiter et al [729][730][731][732][733][734][735] or if the reaction is run in a donor solvent (THF). 734 The authors indicate 731 that the reaction cannot be extended to other η 6 -cyclopolyene complexes such as (η 6 -1,3,5-cyclooctatriene)Cr(CO) 3 or (η 6 -1,3,5,7-cyclooctatetraene)Cr(CO) 3 and that the molybdenum and tungsten homologues of 448 do not give comparable reactions.…”

“…In a series of papers, Kreiter et al. − have reported on the photochemically induced [6+4] cycloaddition of conjugated dienes 461 to (η 6 -cycloheptatriene)- ( 448 ), (η 6 -heptafulvene)- and (η 6 -heptafulvalene)tricarbonylchromium moieties. [An overview is given in ref .]…”

Transition metal catalyzed [6 + 2] cycloadditions

“…The use of metal catalysts in these cycloaddition reactions have found an extensive place in literature. Metal catalysts such as titanium, 26 ruthenium, 27 molybdenum, 28 cobalt, 29 chromium 30 and iron 31 complexes have been widely used to perceive such reactions. Mach et al have engaged Ziegler catalyst (TiCl 4 /Et 2 AlCl) in achieving these [6 + 2] cycloadditions.…”

Rhodium-Catalyzed [6 + 2] Cycloaddition of Internal Alkynes with Cycloheptatriene: Catalytic Study and DFT Calculations of the Reaction Mechanism

“…A variety of stoichiometric [6 + 2] cycloadditions of conjugated cyclic trienes with alkenes, dienes, and alkynes have been intensively investigated, and it has been found that [6 + 2] cycloadditions can be extended to other metal complexes, such as iron, chromium, cobalt, molybdenum, ruthenium, and titanium complexes . A catalytic [6 + 2] cycloaddition reaction using a Ziegler (TiCl 4 /Et 2 AlCl) catalyst was first reported by Mach .…”