5960-69-0Relevant articles and documents
A combined experimental and computational study on the cycloisomerization of 2-ethynylbiaryls catalyzed by dicationic arene ruthenium complexes
Yamamoto, Yoshihiko,Matsui, Kazuma,Shibuya, Masatoshi
supporting information, p. 7245 - 7255 (2015/05/05)
Ruthenium-catalyzed cycloisomerization of 2-ethynylbiaryls was investigated to identify an optimal ruthenium catalyst system. A combination of [η6-(p-cymene)RuCl2(PR3)] and two equivalents of AgPF6 effectively converted 2-ethynylbiphenyls into phenanthrenes in chlorobenzene at 120 °C over 20 h. Moreover, 2-ethynylheterobiaryls were found to be favorable substrates for this ruthenium catalysis, thus achieving the cycloisomerization of previously unused heterocyclic substrates. Moreover, several control experiments and DFT calculations of model complexes were performed to propose a plausible reaction mechanism.
Is the Hoveyda-Grubbs complex a vinylogous fischer-type carbene? Aromaticity-controlled activity of ruthenium metathesis catalysts
Barbasiewicz, Michal,Szadkowska, Anna,Makal, Anna,Jarzembska, Katarzyna,Wozniak, Krzysztof,Grela, Karol
supporting information; experimental part, p. 9330 - 9337 (2009/10/01)
Three naphthalene-based analogues (4a-c) of the Hoveyda-Grubbs metathesis catalyst exhibited immense differences in reactivity. Systematic structural and spectroscopic studies revealed that the ruthenafurane ring present in all 2-isopropoxyarylidene chelates possesses some aromatic character, which inhibits catalyst activity. This aromatic stabilization within the chelate ring may be controlled by variation of the polycyclic core topology as was demonstrated for tetraline and phenanthrene derivatives (4d,e). General conclusions about a new mode of ligand-structure tuning in catalytic systems are presented.
On the Acetylation of Phenanthrene and 9-Chlorphenanthrene
Fernandez, Franco,Gomez, Generosa,Lopez, Carmen,Santos, Ana
, p. 15 - 21 (2007/10/02)
Friedel-Crafts acetylation of phenanthrene (1a) in sym-tetrachlorethane yields mixtures of 2-,3- and 9-acetylphenanthrenes (2a,3a,4).The distribution of isomers is found to depend strongly upon the method of mixing the reagents.Acetylation of 9-chlorophenanthrene (1b), perfomed by a variety of methods and solvents, led mainly to 3-acetyl-9-chlorophenanthrene (3b) (>/=85percent).Previously unreported 2-acetyl-9-chlorophenanthrene (2b) was found to form up to a maximum 11percent in nitrobenzene.