Results 141 to 150 of about 5,480 (191)
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2018
Abstract During the past two decades, among all the types of transition-metal-catalyzed reaction, olefin metathesis has become arguably the most powerful synthetic tool for carbon–carbon bond formation. The reason for this is undoubtedly the development of well-defined functional-group-tolerant N-heterocyclic carbene (NHC) based ruthenium alkylidene ...
A. Jana, P. Malecki, K. Grela
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Abstract During the past two decades, among all the types of transition-metal-catalyzed reaction, olefin metathesis has become arguably the most powerful synthetic tool for carbon–carbon bond formation. The reason for this is undoubtedly the development of well-defined functional-group-tolerant N-heterocyclic carbene (NHC) based ruthenium alkylidene ...
A. Jana, P. Malecki, K. Grela
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Catalytic Nitrile-Alkyne Cross-Metathesis
Journal of the American Chemical Society, 2007The first catalytic cross-metathesis reaction of an alkyne with a nitrile is described. The nitride complex N⋮W(OC(CF3)2CH3)3(DME) undergoes reversible triple-bond metathesis reactions with alkynes (RC⋮CR; R = Et, 4-C6H4OMe), forming the alkylidyne complexes RC⋮W(OC(CF3)2CH3)3(DME) (R = Et, 4-C6H4OMe) along with the corresponding nitrile RC⋮N. This has
Andrea M, Geyer +3 more
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Chemical & Engineering News Archive, 2007
OLEFIN CROSS-METATHESIS , the coupling of two distinct alkenes, is a useful synthetic organic reaction, but it has only rarely been achieved on solid phase. Researchers have now found that proper spacing between the polymer support and the tethered alkene makes the solid-phase reaction more feasible.
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OLEFIN CROSS-METATHESIS , the coupling of two distinct alkenes, is a useful synthetic organic reaction, but it has only rarely been achieved on solid phase. Researchers have now found that proper spacing between the polymer support and the tethered alkene makes the solid-phase reaction more feasible.
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Cross-Metathesis Assisted by Microwave Irradiation
The Journal of Organic Chemistry, 2005Microwave irradiation effectively accelerates cross-coupling metathesis reactions between deactivated olefins. Reactions have been carried out with the phosphine-free Hoveyda-Grubbs catalyst and the "second generation Grubbs' catalyst." While there have been reports that a "microwave effect" is observed in various transformations, the accelerations we ...
Frédéric C, Bargiggia +1 more
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Cross Metathesis Route in Sphingomyelin Synthesis
Chemistry Letters, 2004Abstract Cross metathesis reaction of short chain Boc sphingosine using Grubbs’ 2nd generation catalyst proceeded in stereoselective manner to afford Boc sphingosine in good yield. An efficient synthesis of sphingomyelin was achieved from the obtained Boc sphingosine using our own phosphorylation reagent.
Hiroko Hasegawa +4 more
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Synthesis of Symmetrical Trisubstituted Olefins by Cross Metathesis
Organic Letters, 2002AbstractFor Abstract see ChemInform Abstract in Full Text.
Chatterjee, Arnab K. +2 more
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Nucleoside homodimerisation by cross metathesis
Tetrahedron Letters, 2001Abstract The cross metathesis of 3′-allylic analogues of thymidine, 2′-deoxyuridine and 2′-deoxycytidine is used to obtain nucleoside dimers, in which an unsaturated hydrocarbon chain links the 3′ positions of the sugar moieties. The biological activity on HIV infected cells was also evaluated.
Nathalie Batoux +6 more
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ChemInform Abstract: Cross‐Metathesis
ChemInform, 1999AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Susan E. Gibson, Stephen P. Keen
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Alkyne Cross Metathesis Reactions of Extended Scope
Organic Letters, 2000[figure: see text] A catalyst formed in situ from Mo[N(t-Bu)(Ar)]3 1 (Ar = 3,5-dimethylphenyl) and CH2Cl2 in toluene effects cross metathesis reactions of functionalized alkynes that are beyond reach of more traditional promotors. An application to the synthesis of prostaglandin E2 (PGE2) 19 and the acetylated PGE derivative 18b shows the compatibility
Fürstner, A., Mathes, C.
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Polymer degradation by cross metathesis
Pure and Applied Chemistry, 1982Abstract
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