53146-05-7Relevant academic research and scientific papers
A dicationic ruthenium alkylidene complex for continuous biphasic metathesis using monolith-supported ionic liquids
Autenrieth, Benjamin,Frey, Wolfgang,Buchmeiser, Michael R.
, p. 14069 - 14078 (2012)
A dicationic ruthenium-alkylidene complex [Ru(dmf)3(IMesH 2)(=CH-2-(2-PrO)-C6H4)][(BF4) 2] (1; IMesH2=1,3-dimesitylimidazolin-2-ylidene) has been prepared and used in continuous metathesis reactions by exploiting supported ionic-liquid phase (SILP) technology. For these purposes, ring-opening metathesis polymerization (ROMP)-derived monoliths were prepared from norborn-2-ene, tris(norborn-5-ene-2-ylmethyloxy)methylsilane, and [RuCl 2(PCy3)2(CHPh)] (Cy=cyclohexyl) in the presence of 2-propanol and toluene and surface grafted with norborn-5-en-2-ylmethyl-N,N, N-trimethylammonium tetrafluoroborate ([NBE-CH2-NMe 3][BF4]). Subsequent immobilization of the ionic liquid (IL), 1-butyl-2,3-dimethylimidazolium tetrafluoroborate ([BDMIM][BF 4]), containing ionic catalyst 1 created the SILP catalyst. The use of a second liquid transport phase, which contained the substrate and was immiscible with the IL, allowed continuous metathesis reactions to be realized. High turnover numbers (TONs) of up to 3700 obtained in organic solvents for the ring-closing metathesis (RCM) of, for example, N,N-diallyltrifluoroacetamide, diethyl diallylmalonate, diethyl di(methallyl)malonate, tert-butyl-N,N- diallylcarbamate, N,N-diallylacetamide, diphenyldiallylsilane, and 1,7-octadiene, as well as in the self-metathesis of methyl oleate, could be further increased by using biphasic conditions with [BDMIM][BF 4]/heptane. Under continuous SILP conditions, TONs up to 900 were observed. Due to the ionic character of the initiator, catalyst leaching into the transport phase was very low (4]/1, the recycled support material again qualified for utilization in continuous metathesis reactions. Copyright
The Synthesis of Nitrogen Heterocycles via the Intramolecular Khand Reaction: Formation of Tetra- and Hexa-hydrocyclopentapyrrol-5(1H)-ones and Hexahydro-6H-2-pyrindin-6-ones
Brown, Scott W.,Pauson, Peter L.
, p. 1205 - 1209 (2007/10/02)
Azabicyclooctenones and azabicyclononenones have been obtained by cyclisation of hexacarbonyldicobalt complexes of aza-heptenynes and -octenynes respectively.An unusual feature of the cyclisation of N-acyl-4-azahept-1-en-6-ynes is the extens
