Results 251 to 260 of about 35,108 (280)

Incarcerated Carbenes

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
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Constrained Carbenes

European Journal of Organic Chemistry, 2006
AbstractCarbenes traditionally have been used for cyclopropane synthesis but little else, since their reactions are difficult to control. However, the burgeoning discipline of supramolecular carbene chemistry—reactions in which highly reactive, divalent carbon intermediates are generated within the confines of host compounds—is making steady progress ...
Rosenberg, Murray G., Brinker, Udo H.
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Heterocyclic Carbenes

Angewandte Chemie International Edition, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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Low temperature carbene-to-carbene homologations

Research on Chemical Intermediates, 1994
Since alkynes have higher symmetry than olefins, it is not easy to infer the mechanism of a triplet carbene’s addition to an alkyne by traditional product analysis studies. Specifically, no stereochemical information which might offer insight into the carbene’s spin state can be extracted from the cyclopropene products.
M. S. Lee, James E. Jackson
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Carbene Olefin Complexes and Carbene Philicity

Tetrahedron Letters, 1983
Abstract The effect of carbene-olefin complexation on the relationship between absolute rates obtained by laser flash photolysis and product ratios are considered. The conditions needed to give linear Hammett plots in the complex mechanism are detailed.
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Genuine carbene versus carbene‐like reactivity

Angewandte Chemie
AbstractSinglet carbenes are not always isolable and often even elude direct detection. When they escape observation, their formation can sometimes be evidenced by in situ trapping experiments. However, is carbene‐like reactivity genuine evidence of carbene formation?
Jan Lorkowski, Patrick Yorkgitis, Melinda R. Serrato, Milan Gembicky, Cezary Pietraszuk, Guy Bertrand, Rodolphe Jazzar   +6 more
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Synthesis, structure, and reactivity of metallacycle-carbene and -bis(carbene) complexes. A new intramolecular carbene-carbene coupling process

Journal of the American Chemical Society, 1990
AbstractThe cationic chloride abstraction product (III) from (I) reacts with 3‐butyn‐1‐ol (IVa) or 4‐pentyn‐2‐ol (IVb) to give the iridiacyclopentadiene‐carbene complexes (Va) and (Vb).
Lin Pu, Arnold L. Rheingold, Joseph M. O'Connor   +2 more
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Synthesis of Carbenes Through Substitution Reactions at a Carbene Center

Science, 2003
An (amino)(phosphino) carbene can be transformed into (amino)(phosphonio) carbenes, which undergo nucleophilic intermolecular as well as intramolecular substitution reactions at the carbene center. A variety of carbenes can be synthesized starting from a single carbene precursor. The resulting gamut of electronic and steric effects possible should open
Guy Bertrand, Nathalie Merceron-Saffon, Heinz Gornitzka, Antoine Baceiredo   +3 more
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The Skattebol rearrangement: evidence for carbene to carbene mechanism

The Journal of Organic Chemistry, 1984
Etude de la decomposition du diazo-8 bicyclo [5.1.0] octene-2 afin de determiner si un vinyl-2 carbenacyclopropane peut se transposer en un carbenacyclopentene ...
P. Warner, I-Shan Chu
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Catalysis of Organic Reactions by Carbenes and Carbene Complexes

Chemistry of Heterocyclic Compounds, 2013
AbstractReview: 70 refs.
K. A. Marichev, Artyom V. Kiselyov, Nataliya V. Glinyanaya, V. Sh. Saberov, Gennady F. Rayenko, Arthur V. Knishevitsky, Nikolai I. Korotkikh, O. P. Shvaika   +7 more
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