Results 111 to 120 of about 20,349 (227)

A Synthetic Approach Toward a Brominated Oxocane Labdane Diterpenoid Isolated From

Natural Product Communications, 2020
The synthesis of a labdane oxocane epoxy-alcohol is described starting from the Wieland–Miescher ketone derivative via ring closing olefin metathesis of a diene derivative, targeting the total synthesis of a brominated oxocane labdane diterpenoid ...
Hisahiro Hagiwara, Shohei Fujiwara, Chikako Iibachi, Toshio Suzuki, Takashi Hoshi   +4 more
doaj   +1 more source

Template-Directed Olefin Cross Metathesis

Organic Letters, 2005
[reaction: see text] A template containing two secondary dialkylammonium ion recognition sites for encirclement by olefin-bearing dibenzo[24]crown-8 derivatives has been used to promote olefin cross metatheses with ruthenium-alkylidene catalysts.
Stuart J, Cantrill, Robert H, Grubbs, Daniela, Lanari, Ken C-F, Leung, Alshakim, Nelson, Katherine G, Poulin-Kerstien, Sebastian P, Smidt, J Fraser, Stoddart, David A, Tirrell   +8 more
openaire   +4 more sources

Cyclic Ruthenium-Alkylidene Catalysts for Ring-Expansion Metathesis Polymerization [PDF]

, 2008
A series of cyclic Ru-alkylidene catalysts have been prepared and evaluated for their efficiency in ring-expansion metathesis polymerization (REMP). The catalyst structures feature chelating tethers extending from one N-atom of an N-heterocyclic carbene (
Boydston, Andrew J., Gorodetskaya, Irina A., Grubbs, Robert H., Kornfield, Julia A., Xia, Yan   +4 more
core   +1 more source

Ruthenium Olefin Metathesis Catalysts Bearing an N-Fluorophenyl-N-Mesityl-Substituted Unsymmetrical N-Heterocyclic Carbene [PDF]

, 2007
Two new ruthenium-based olefin metathesis catalysts, each bearing an unsymmetrical N-heterocyclic carbene ligand, have been synthesized and fully characterized.
Grubbs, Robert H., Vougioukalakis, Georgios C.   +1 more
core   +1 more source

Bio‐Based Polyurethanes: Mechanical Performance, Structure–Property Relationships, and Future Directions

Journal of Polymer Science, Volume 64, Issue 9, Page 1860-1894, 1 May 2026.
This review examines bio‐based polyurethanes from renewable feedstocks, focusing on structure‐property relationships governing mechanical performance. It analyzes reinforcement strategies, benchmarks against petrochemical counterparts, and explores future directions, including non‐isocyanate routes and circular economy integration for sustainable high ...
Khaled Chawraba, Hussein Medlej, Mohamad Sakr, Akram Hijazi, Abrar Hussain   +4 more
wiley   +1 more source

A Tandem Approach to Photoactivated Olefin Metathesis: Combining a Photoacid Generator with an Acid Activated Catalyst [PDF]

, 2009
Combining an acid activated precatalyst with a photoacid generator (PAG) in the presence of ultraviolet light resulted in a highly efficient catalyst for olefin metathesis.
Grubbs, Robert H., Keitz, Benjamin K.
core   +1 more source

Highly efficient synthesis of the tricyclic core of Taxol by cascade metathesis [PDF]

, 2014
An efficient enantioselective synthesis of the ABC tricyclic core of the anticancer drug Taxol is reported. The key step of this synthesis is a cascade metathesis reaction, which leads in one operation to the required tricycle if appropriate fine-tuning ...
Aldegunde M. J., Aldegunde M. J., Aldegunde M. J., Aurélien Letort, Bourgeois D., Bourgeois D., Bourgeois D., Bourgeois D., Bourgeois D., Chatterjee A. K., Cong Ma, De-Liang Long, Doi T., Garber S. B., Goldring P. D., Grieco P. A., Holton R. A., Holton R. A., Joëlle Prunet, Kim S.-H., Ma C., Masters J. J., Mendoza A., Morihara K., Mukaiyama T., Muller B., Muller B., Nicolaou K. C., Rémi Aouzal, Schiltz S., Scholl M., Schwab P., Swindell C. S., Wender P. A., Wender P. A., Wilde N. C., Winkler J. D., Yamazaki Y., Yared J. A., Yvon D.   +39 more
core   +3 more sources

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

Thermally Stable, Latent Olefin Metathesis Catalysts [PDF]

, 2011
Highly thermally stable N-aryl, N-alkyl N-heterocyclic carbene (NHC) ruthenium catalysts were designed and synthesized for latent olefin metathesis. These catalysts showed excellent latent behavior toward metathesis reactions, whereby the complexes were ...
Fedorov, Alexey, Grubbs, Robert H., Keitz, Benjamin K., Thomas, Renee M.   +3 more
core   +3 more sources

Olefin metathesis in multiblock copolymer synthesis

Beilstein Journal of Organic Chemistry, 2019
Multiblock copolymers constitute a basis for an emerging class of nanomaterials that combine various functional properties with durability and enhanced mechanical characteristics. Our mini-review addresses synthetic approaches to the design of multiblock
Maria L. Gringolts, Yulia I. Denisova, Eugene Sh. Finkelshtein, Yaroslav V. Kudryavtsev   +3 more
doaj   +1 more source