Results 241 to 250 of about 35,108 (280)

A Carbene−Carbene Complex Equilibrium

Journal of the American Chemical Society, 2010
Phenylchlorocarbene, generated by laser flash photolysis of phenylchlorodiazirine, formed highly stable pi-type complexes with 1,3,5-trimethoxybenzene in pentane. The carbene and carbene complexes were in equilibrium. We measured the equilibrium constant (K = 1264 M(-1) at 294 K) and, from its temperature dependence, extracted the associated ...
Christina M. Odorisio, Lei Wang, Robert A. Moss, Karsten Krogh-Jespersen   +3 more
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Ultrafast Carbene−Carbene Isomerization

Journal of the American Chemical Society, 2008
The photochemistry of two isomeric aryl diazo ketones was investigated by fs time-resolved UV-vis and IR spectroscopies. Both diazo ketone excited states decompose in less than 300 fs by multiple pathways. One pathway involves concerted Wolff rearrangement and nitrogen extrusion, most likely in the syn rotomer. In the anti rotomer of one isomer, oxygen
Gotard Burdzinski, Jacek Kubicki, Terry L. Gustafson, Jin Wang, Matthew S. Platz   +4 more
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Bond Dissociation Energies of Carbene–Carbene and Carbene–Main Group Adducts

The Journal of Physical Chemistry A, 2022
A range of carbene structures and their adducts with one another and with a selection of small-molecule electrophiles and nucleophiles were examined at the composite correlated molecular orbital theory G3MP2 level to explore ground-state "carbenic" structures, their stabilities, and reactivities.
Monica Vasiliu, Kyle C. Edwards, Daniela Tapu, Clarisa E. Castillo, Trent H. Stein, Raluca Craciun, Anthony J. Arduengo, David A. Dixon   +7 more
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ChemInform Abstract: Carbenes and Nitrenes

ChemInform, 2004
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
David M. Hodgson, M. Christlieb, Emmanuel Gras   +2 more
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Are There Carbenes in N‐Heterocyclic Carbene Organocatalysis?

Angewandte Chemie International Edition, 2017
AbstractAzolium cations are widely employed in organocatalysis to catalyse highly valuable synthetic processes in the presence of a base. These reactions are called “N‐heterocyclic carbene catalysis”, based on the assumption that they are initiated by the formation of a free carbene through deprotonation, which can then react with the substrates and ...
Oldamur Hollóczki, Sascha Gehrke, Sascha Gehrke   +2 more
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ChemInform Abstract: CARBEN‐CARBEN‐UMLAGERUNGEN

Chemischer Informationsdienst, 1973
AbstractBei Temperaturen zwischen 250 und 600°C wird Phenylcarben (Ia) in das Carben (IIa) umgelagert, das zum Heptafulvalen (IIIa) dimerisiert.
T L Davis, Edward E. Waali, Robert C. Joines, Tsutomu Mitsuhashi, Andrew B. Turner, Kenneth E. Krajca, William M. Jones, John A. Myers   +7 more
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Carbenes and Nitrenes

ChemInform, 1997
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
openaire   +4 more sources

ChemInform Abstract: Carbenes and Nitrenes

ChemInform, 1989
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
openaire   +3 more sources

Formation of a pyrrole by carbene - carbene rearrangement

Tetrahedron Letters, 1982
Abstract A pyrrole is formed through a carbene-carbene rearrangement, as shown by specific 12 C labelling experiments.
Lars Skattebøl, Jacek Arct
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