Results 71 to 80 of about 10,092 (232)

(2E,2′E)-3-(4-{[4-(4-Hydroxy-3-methoxyphenyl)but-2-en-1-yl]oxy}phenyl)-1-(2-hydroxy-4-methoxyphenyl)prop-2-en-1-one

Molbank, 2016
A hybrid of eugenol and a chalcone has been synthesized in good yield via cross olefin metathesis. The title compound (3) was characterized by spectroscopic data including NMR, infrared, and ESI-MS.
Muhamad S. Fareza, Didin Mujahidin, Yana M. Syah   +2 more
doaj   +1 more source

Si─Si Bonding in an Unsupported N‐Heterocyclic Silylene Dimer Stabilized by an Iminophosphorane‐Based Scorpionate Ligand Versus Head‐to‐Tail Coordination in the Sn and Pb Tetrylenes

Chemistry – A European Journal, EarlyView.
A new iminophosphorane‐based scorpionate ligand enabled the characterization of a head‐to‐head silylene dimer with unsupported Si─Si bonding, whereas the tetrylene species of Sn and Pb afforded head‐to‐tail coordination polymers in the solid state. ABSTRACT N,N‐chelating ligands disfavor element–element bonding in heavier alkene analogs of group 13 and
Huanhuan Dong, Rochelle Ferns, Luke W. Giles, Lea Fohlmeister, Connor Bourne, Samuel R. Lawrence, Aidan P. McKay, Alexandra M. Z. Slawin, David B. Cordes, Tanja van Mourik, Andreas Stasch   +10 more
wiley   +1 more source

Alkali‐Metal Base Catalyzed Electrocyclization of Isoprene Derivatives

Chemistry – A European Journal, EarlyView.
Simple and abundant alkali‐metal base catalysis in combination with Lewis basic polyamines enables the electrocyclization of isoprene‐derived trienes to cycloheptadienes under neat conditions. Mechanistic insight supported by DFT guides a scalable route to seven‐membered carbocycles which, after reduction, give saturated cycloalkanes relevant as ...
Mikaël Le Roch, Krzysztof Piech, Aurélien Crochet, Andreu Tortajada   +3 more
wiley   +1 more source

Breaking the Mold: Electrophilic Hydrophosphanation Emerges

Chemistry – A European Journal, EarlyView.
Electrophilic hydride attack on the olefin, instead of the classical nucleophilic addition by a phosphanido ligand, is unveiled in rhodium‐catalyzed olefin hydrophosphanation. This hydride‐driven pathway operates for both activated and inactivated olefins, with transition states characterized by elongated Rh─H bonds and nascent C─H bond formation ...
Víctor Varela‐Izquierdo, Janeth Navarro, Judit Cano‐Asensio, José A. López, Cristina Tejel   +4 more
wiley   +1 more source

Olefin Metathesis Reaction in Water and in Air Improved by Supramolecular Additives

Molecules, 2015
A range of water-immiscible commercially available Grubbs-type precatalysts can be used in ring-closing olefin metathesis reaction in high yields. The synthetic transformation is possible in pure water under ambient conditions.
Jasmine Tomasek, Miriam Seßler, Harald Gröger, Jürgen Schatz   +3 more
doaj   +1 more source

Insights into the Decomposition of Olefin Metathesis Precatalysts

Angewandte Chemie International Edition, 2014
AbstractThe decomposition of a series of benzylidene, methylidene, and 3‐phenylindenylidene complexes has been probed in alcohol solution in the presence of base. Tricyclohexylphosphane‐containing precatalysts are shown to yield [RuCl(H)(H2)(PCy3)2] in isopropyl alcohol solutions, while 3‐phenylindenylidene complexes lead to η5‐(3‐phenyl)indenyl ...
Manzini, S., Poater, A., Nelson, D.J. Cavallo, L., Slawin, A.M.Z. and Nolan, S.P.   +9 more
openaire   +5 more sources

Structure Elucidation and Total Synthesis of Granolides A–C: Ethyl‐branched Sesquiterpenes From the Tropical Frog Gephyromantis granulatus

Chemistry – A European Journal, EarlyView.
Males of the tropical frog Gephyromantis granulatus carry unique ethyl‐branched sesquiterpenoid macrolactones in their scent glands. Their structure elucidation was performed by GC/MS, leading to the proposed structures of the granolides. A flexible enantioselective synthesis confirmed the structures and allowed determination of their absolute ...
Johanna Kuhn, Miguel Vences, Stefan Schulz   +2 more
wiley   +1 more source

Synthesis and Characterisation of Degradable Thermosetting Materials [PDF]

, 2012
Traditional thermosetting materials generally display good durability, yet poor tractability, reworkability, and degradability. This project, however, provides a class of thermoset ring-opening metathesis polymerization (ROMP) materials based on ...
HOU, SHENGHUI
core  

Superelectrophilic Aluminum(III)-Ion Pairs Promote a Distinct Reaction Path for Carbonyl-Olefin Metathesis of Medium-Sized Rings

, 2019
We describe the development of a new catalyst system for carbonyl-olefin ring-closing metathesis reactions that relies on Lewis acidic superelectrophiles and significantly expands the current scope of this transformation to medium-sized rings ...
Ashlee J., Davis, Jessica L., Gomez-Lopez, Corinna, Schindler, Rebecca, Watson, Daniel, Nasrallah   +4 more
core   +1 more source

Recent Advances in Carbonyl–Olefin and Carbonyl–Alkyne Metathesis Reactions

ChemistryEurope
Carbonyl–olefin and carbonyl–alkyne metathesis reactions are powerful strategies for the formation of carbon–carbon bonds, offering access to structurally diverse molecules.
Komal Kalonia, Ramees Komath, Martin Breugst   +2 more
doaj   +1 more source