53720-72-2Relevant articles and documents
Light-and Thermal-Activated Olefin Metathesis of Hindered Substrates
Ivry, Elisa,Frenklah, Alexander,Ginzburg, Yakov,Levin, Efrat,Goldberg, Israel,Kozuch, Sebastian,Lemcoff, N. Gabriel,Tzur, Eyal
, p. 176 - 181 (2018/02/06)
Efficient light-and thermal-Activated metathesis reactions of tetra-substituted olefins were obtained by the S-chelated ruthenium precatalyst Tol-SCF3. Its reactivity in a series of benchmark olefin metathesis reactions was compared to previous
An [(NHC)(NHCEWG)RuCl2(CHPh)] complex for the efficient formation of sterically hindered olefins by ring-closing metathesis
Vorfait, Tim,Leuthaeusser, Steffen,Plenio, Herbert
supporting information; experimental part, p. 5191 - 5194 (2009/12/24)
NHC with EWGs for RCM: Ruthenium complexes with two N-heterocyclic carbenes (NHCs), one of them substituted with electron-withdrawing groups (EWGs), are highly efficient (pre) catalysts for the synthesis of tetrasubstituted olefins and trisubstituted olef
A hexafluorobenzene promoted ring-closing metathesis to form tetrasubstituted olefins
Rost, Daniel,Porta, Marta,Gessler, Simon,Blechert, Siegfried
scheme or table, p. 5968 - 5971 (2009/04/04)
Highly efficient formation of tetrasubstituted olefins is described by ring-closing metathesis (RCM) using catalyst 2 in presence of hexafluorobenzene. This combination with hexafluorobenzene shows an unexpected promoting effect, which requires low cataly
PRODUCTION OF 2,5-DIHYDROFURANS AND ANALOGOUS COMPOUNDS
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Page/Page column 8, (2008/06/13)
Vinyl oxiranes are rearranged to 2,5-dihydrofuran using catalyst (III) or (IV). The 2,5-dihydrofuran can be reduced to tetrahydrofuran. 3,4-Epoxy-l-butene substrate is converted to 2,5-dihydrofuran which in turn is converted to tetrahydrofuran. Substrate
Ruthenium-catalyzed ring-closing metathesis to form tetrasubstituted olefins
Berlin, Jacob M.,Campbell, Katie,Ritter, Tobias,Funk, Timothy W.,Chlenov, Anatoly,Grubbs, Robert H.
, p. 1339 - 1342 (2008/01/03)
Figure presented Increased efficiency for ring-closing metathesis to form tetrasubstituted olefins using N-heterocyclic carbene ligated ruthenium catalysts was achieved by reducing the size of the substituants at the ortho positions of the N-bound aryl ri
Highly efficient ruthenium catalysts for the formation of tetrasubstituted olefins via Ring-Closing Metathesis
Stewart, Ian C.,Ung, Thay,Pletnev, Alexandre A.,Berlin, Jacob M.,Grubbs, Robert H.,Schrodi, Yann
, p. 1589 - 1592 (2008/02/03)
Equation presented A series of ruthenium-based metathesis catalysts with N-heterocyclic carbene (NHC) ligands have been prepared in which the N-aryl groups have been changed from mesityl to mono-ortho-substituted phenyl (e.g., tolyl). These new catalysts
ORGANOMETALLIC RUTHENIUM COMPLEXES AND RELATED METHODS FOR THE PREPARATION OF TETRA-SUBSTITUTED AND OTHER HINDERED OLEFINS
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Page/Page column 43, (2010/11/27)
The invention relates to ruthenium alkylidene complexes having an N-heterocyclic carbene ligand comprising a 5-membered heterocyclic ring having a carbenic carbon atom and at least one nitrogen atom contained within the 5-membered heterocyclic ring, wherein the nitrogen atom is directly attached to the carbenic carbon atom and is substituted by a phenyl ring, and wherein the phenyl ring has a hydrogen at either or both ortho positions and is substituted and at least one orthq or meta position. The invention also relates to an olefin metathesis reactions and particularly to the preparation of tetra-substituted cyclic olefins via a ring-closing metathesis.
Copper-catalyzed rearrangement of vinyl oxiranes
Batory, Lindsay A.,McInnis, Christine E.,Njardarson, Jon T.
, p. 16054 - 16055 (2007/10/03)
A novel copper-catalyzed vinyl oxirane ring expansion protocol has been developed. A wide range of vinyl oxiranes can be rearranged to 2,5-dihydrofurans in excellent yields in the presence of electrophilic copper(II) acetylacetonate catalysts. Regioisomeric vinyl oxiranes can be converted to a single dihydrofuran product using these conditions. This method uses low catalyst loadings (0.5-5 mol %), has good tolerance of substitution patterns, and can be done in the absence of solvent. Copyright
Isomerization of epoxyalkenes to 2,5-dihydrofurans
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Example 253-254, (2008/06/13)
Disclosed are processes for the isomerization of epoxyalkenes to dihydrofurans by contacting an epoxyalkene with a catalyst comprising a quaternary organic onium iodide compounds, optionally deposited on a non-acidic support and/or in combination with a Lewis acid co-catalyst. The catalyst may comprise a supported catalyst, an unsupported catalyst or a solution of the catalytically-active components in an inert, organic solvent.