Results 11 to 20 of about 17,341 (257)

Tandem Cyclopropanation/Ring-Closing Metathesis of Dienynes [PDF]

Journal of the American Chemical Society, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Brian P, Peppers, Steven T, Diver
openaire   +4 more sources

Silicon Catalyzed C-O Bond Ring Closing Metathesis of Polyethers. [PDF]

Angew Chem Int Ed Engl, 2022
Ansmann N, Thorwart T, Greb L.
europepmc   +2 more sources

Ruthenium Olefin Metathesis Catalysts Bearing Carbohydrate-Based N-Heterocyclic Carbenes [PDF]

, 2010
Ru-based olefin metathesis catalysts containing carbohydrate-derived NHCs from glucose and galactose were synthesized and characterized by NMR spectroscopy. 2D-NMR spectroscopy revealed the presence of Ru−C (benzylidene) rotamers at room temperature, and
Grubbs, Robert H., Keitz, Benjamin K.
core   +2 more sources

Formation of bridged bicycloalkenes via ring closing metathesis [PDF]

, 1998
Ring closing metathesis may be used in the formation of small ring bicycloalkenes from monocyclic diene ...
Grubbs, Robert H., Morehead, Andrew, Jr.
core   +1 more source

Facile Synthesis of Effcient and Selective Ruthenium Olefin Metathesis Catalysts with Sulfonate and Phosphate Ligands [PDF]

, 2010
A series of novel, air-stable ruthenium NHC catalysts with sulfonate and phosphate anions have been prepared easily in one pot at high yields using commercially available precursors.
Grubbs, Robert H., Teo, Peili
core   +1 more source

Studies Towards the Total Synthesis of Di- and Sesterterpenes with Dicyclopenta[a,d]cyclooctane Skeletons. Three-component Approach to the A/B Rings Building Block

Molecules, 2005
Sesqui- and sesterterpenes of ophiobolin and fusicoccin families are important synthetic targets because of complexity of structure and potentially useful physiological activities, including anti-tumor activity.
J. Wicha, M. Michalak, K. Michalak
doaj   +1 more source

The catalytic performance of Ru–NHC alkylidene complexes: PCy3 versus pyridine as the dissociating ligand

Beilstein Journal of Organic Chemistry, 2010
The catalytic performance of NHC-ligated Ru-indenylidene or benzylidene complexes bearing a tricyclohexylphosphine or a pyridine ligand in ring closing metathesis (RCM), cross metathesis, and ring closing enyne metathesis (RCEYM) reactions is compared ...
Stefan Krehl, Diana Geißler, Sylvia Hauke, Oliver Kunz, Lucia Staude, Bernd Schmidt   +5 more
doaj   +1 more source

Cascade metathesis reactions for the synthesis of taxane and isotaxane derivatives [PDF]

, 2016
Tricyclic isotaxane and taxane derivatives and have been synthesized by a very efficient cascade ring-closing dienyne metathesis (RCDEYM) reaction, which formed the A and B rings in one operation.
Aouzal, Remi, Farrugia, Louis J., Letort, Aurelien, Ma, Cong, Maiti, Gourhari, Prunet, Joelle, Ricard, Louis, Wilkes, Antonia   +7 more
core   +3 more sources

Synthesis of fluorinated δ-lactams via cycloisomerization of gem-difluoropropargyl amides

Beilstein Journal of Organic Chemistry, 2010
gem-Difluoro-1,7-enyne amides are suitable building blocks for the synthesis of difluorodihydropyridinones via a ring-closing metathesis reaction, and of 4,4-difluoro-3-oxoisoquinolines through a ring-closing metathesis–enyne metathesis tandem reaction ...
Satoru Arimitsu, Gerald B. Hammond
doaj   +1 more source

A reação de metátese de olefinas: reorganização e ciclização de compostos orgânicos The olefin metathesis reaction: reorganization and ciclization of organic compounds

Química Nova, 2005
The olefin metathesis reaction allows the exchange of complex alkyl units between two olefins, with the formation of a new olefinic link and a sub-product olefin usually ethylene.
Daniel Frederico, Ursula Brocksom, Timothy John Brocksom   +2 more
doaj   +1 more source