Results 281 to 290 of about 101,444 (317)
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The Journal of Organic Chemistry, 2021
Using DFT and ab initio calculations, we demonstrate that noncyclic formamidines can undergo thermal rearrangement into their isomeric aminocarbenes under rather mild conditions. We synthesized the silylformamidine, for which the lowest activation energy in this process was predicted.
Anatoliy Marchenko +7 more
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Using DFT and ab initio calculations, we demonstrate that noncyclic formamidines can undergo thermal rearrangement into their isomeric aminocarbenes under rather mild conditions. We synthesized the silylformamidine, for which the lowest activation energy in this process was predicted.
Anatoliy Marchenko +7 more
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ChemInform Abstract: CARBEN‐CARBEN‐UMLAGERUNGEN
Chemischer Informationsdienst, 1973AbstractBei Temperaturen zwischen 250 und 600°C wird Phenylcarben (Ia) in das Carben (IIa) umgelagert, das zum Heptafulvalen (IIIa) dimerisiert.
W. M. JONES +7 more
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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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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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Genuine carbene versus carbene‐like reactivity
Angewandte ChemieAbstractSinglet 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 +6 more
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Inorganic Chemistry, 1997
The syntheses, characterizations, and X-ray crystallographic structure determinations are described for adducts of stable nucleophilic carbenes with pnictinidenes. The adducts between 1,3-dimesitylimidazol-2-ylidene and phenylphosphinidene, phenylarsinidene, (trifluoromethyl)phosphinidene, and (pentafluorophenyl)arsinidene are reported.
Anthony J., Arduengo +6 more
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The syntheses, characterizations, and X-ray crystallographic structure determinations are described for adducts of stable nucleophilic carbenes with pnictinidenes. The adducts between 1,3-dimesitylimidazol-2-ylidene and phenylphosphinidene, phenylarsinidene, (trifluoromethyl)phosphinidene, and (pentafluorophenyl)arsinidene are reported.
Anthony J., Arduengo +6 more
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Carbene Rearrangements. Part 64. Constrained Carbenes
ChemInform, 2007AbstractChemInform 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.
Murray G. Rosenberg, Udo H. Brinker
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Angewandte Chemie International Edition in English, 1996
Kristallin erhältlich war mit 1 das erste acyclische Diaminocarben durch Deprotonierung des entsprechenden Formamidiniumions 2. In Lösung zeigen beide Verbindungen ein dynamisches Verhalten (Austausch von ipr‐Gruppen) mit Aktivierungsbarrieren von 53 bzw.
Alder, RW +3 more
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Kristallin erhältlich war mit 1 das erste acyclische Diaminocarben durch Deprotonierung des entsprechenden Formamidiniumions 2. In Lösung zeigen beide Verbindungen ein dynamisches Verhalten (Austausch von ipr‐Gruppen) mit Aktivierungsbarrieren von 53 bzw.
Alder, RW +3 more
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1992
This chapter talks about neutral, divalent, and highly reactive carbon carbenes. These are considered as intermediates and are generally written as R2C. It describes methylene as the simplest carbene, which many early chemists believed was a stable entity and have attempted various experiments for its generation. It also explains the term carbene. This
Christopher J. Moody, Gordon H. Whitham
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This chapter talks about neutral, divalent, and highly reactive carbon carbenes. These are considered as intermediates and are generally written as R2C. It describes methylene as the simplest carbene, which many early chemists believed was a stable entity and have attempted various experiments for its generation. It also explains the term carbene. This
Christopher J. Moody, Gordon H. Whitham
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Carbene-Stabilized Diphosphorus
Journal of the American Chemical Society, 2008The potassium graphite reduction of L:PCl3 leads to the formation of carbene-stabilized diphosphorus molecules, L:P-P:L, 1 (L: = :C{N(2,6-Pri2C6H3)CH}2) and 2 (L: = :C{N(2,4,6-Me3C6H2)CH}2), respectively. The nature of the bonding in 1 and 2 was delineated by DFT computations.
Yuzhong, Wang +6 more
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