Results 91 to 100 of about 17,341 (257)

Total Synthesis of Tulearin C

, 2011
With the help of the smaller brother: Although alkyne metathesis will always be the little brother of alkene metathesis, it allows problems to be solved that are currently beyond reach of the more famous sibling.
Fürstner, A., Gabor, B., Lehr, K., Leseurre, L., Mariz, R.   +4 more
core   +1 more source

A New Ruthenium-Based Olefin Metathesis Catalyst Coordinated with 1,3-Dimesityl-1,4,5,6-tetrahydropyrimidin-2-ylidene: Synthesis, X-ray Structure, and Reactivity [PDF]

, 2004
The new ruthenium olefin metathesis catalyst 4 bearing a 5,5‘-dimethyl-1,3-dimesityl-1,4,5,6-tetrahydropyrimidin-2-ylidene ligand was first synthesized from (PCy_3)_2(Cl)_2Ru ═ CHPh (1).
Grubbs, Robert H., Marinez, Eric R., Yun, Jaesook   +2 more
core   +1 more source

Nonproductive Events in Ring-Closing Metathesis Using Ruthenium Catalysts [PDF]

, 2010
The relative TONs of productive and nonproductive metathesis reactions of diethyl diallylmalonate are compared for eight different ruthenium-based catalysts. Nonproductive cross metathesis is proposed to involve a chain-carrying ruthenium methylidene.
Grubbs, Robert H., Keitz, Benjamin K., Kuhn, Kevin M., Stewart, Ian C., Thomas, Renee M.   +4 more
core   +2 more sources

Hybrid macrocycle formation and spiro annulation on cis-syn-cis-tricyclo[6.3.0.02,6]undeca-3,11-dione and its congeners via ring-closing metathesis

Beilstein Journal of Organic Chemistry, 2015
We have developed a simple methodology to transform cis-syn-cis-triquinane derivative 2 into the diindole based macrocycle 6 involving Fischer indolization and ring-closing metathesis (RCM).
Sambasivarao Kotha, Ajay Kumar Chinnam, Rashid Ali   +2 more
doaj   +1 more source

Synthesis, Structure, and Activity of Enhanced Initiators for Olefin Metathesis [PDF]

, 2003
A series of ruthenium olefin metathesis catalysts of the general structure (H_2IMes)(PR_3)(Cl)_2Ru CHPh (H_2IMes = 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene) have been prepared; these complexes are readily accessible in two steps from commercially ...
Day, Michael W., Grubbs, Robert H., Love, Jennifer A., Sanford, Melanie S.   +3 more
core   +1 more source

Toward a simulation approach for alkene ring-closing metathesis : scope and limitations of a model for RCM [PDF]

, 2011
A published model for revealing solvent effects on the ring-closing metathesis (RCM) reaction of di-Et diallylmalonate 7 has been evaluated over a wider range of conditions, to assess its suitability for new applications.
Adjiman C. S., Ashworth I. W., Ashworth I. W., Bieniek M., Butcher J. C., David J. Nelson, Davide Carboni, Dias E. L., Ercolani G., Farina V., Hillier I. H., Hong S. H., Hong S. H., Hoveyda A. H., Ian W. Ashworth, Jonathan M. Percy, Kingsbury J. S., Kirby A. J., Love J. A., Mitchell L., Ritter T., Romero P. E., Sanford M. S., Scholl M., Shu C., Stewart I. C., Torker S., Tsipis A. C., van der Eide E. F., Vorfalt T., Vorfalt T., Wieberg K. B., Yee N. K., Zahnley T.   +33 more
core   +1 more source

Shedding Light on Synthetic Autocatalysis: From Conventional Closed‐Shell Chemistries to Overlooked Open‐Shell Occurrences

Chemistry – A European Journal, EarlyView.
Why add another catalyst when the product itself holds the power to catalyze its own formation? Autocatalysis in synthetic chemistry enhances reaction efficiency and uncovers novel catalytic behavior across both closed‐shell and open‐shell systems, expanding reactivity and enabling innovative design strategies.
Jaspreet Kaur, Joshua P. Barham
wiley   +1 more source

Nitro-Grela-type complexes containing iodides – robust and selective catalysts for olefin metathesis under challenging conditions

Beilstein Journal of Organic Chemistry, 2015
Iodide-containing nitro-Grela-type catalysts have been synthesized and applied to ring closing metathesis (RCM) and cross metathesis (CM) reactions. These new catalysts have exhibited improved efficiency in the transformation of sterically, non-demanding
Andrzej Tracz, Mateusz Matczak, Katarzyna Urbaniak, Krzysztof Skowerski   +3 more
doaj   +1 more source

Rapid assembly of highly-functionalised difluorinated cyclooctenones via ring-closing metathesis [PDF]

, 2002
Building block methodology from trifluoroethanol and ringclosing metathesis using a Fürstner modification of Grubbs’ conditions allows the rapid synthesis of novel difluorinated ...
Kariuki, Benson M., Owton, W. Martin, Percy, Jonathan, Pintat, Stephane, Smith, Clive A., Spencer, Neil S, Thomas, Andrew C, Watson, Martin   +7 more
core   +1 more source

Distinct Ligand‐ and Metal‐Centered Phosphorescence in a Terbium Carbazolyl Complex

Chemistry – A European Journal, EarlyView.
Terbium and lanthanum carbazolide complexes show two distinct modes of luminescence: Strongly temperature‐dependent narrow‐line terbium emission could be induced. In addition, both the terbium and the lanthanum complexes show broad‐line interligand emission processes with excited states of microsecond life‐time.
Xiaofei Sun, Frederic Krätschmer, Julia Feye, Marcel Lukanowski, Dominik Graf, Sergei Lebedkin, Manfred Kappes, Florian Weigend, Peter W. Roesky, Alexander Hinz   +9 more
wiley   +1 more source