Results 181 to 190 of about 34,597 (238)
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1,4-Carbonyl-carbonyl interactions
Experientia, 1960Es wird gezeigt, dass die IR-Spektren gewisser 1,4-Diketone und 1,4-Ketoester abnorm hohe Carbonylfrequenzen aufweisen, was auf das Vorhandensein eines intramolekularen Feldeffekts zwischen den beiden Carbonylgruppen in diesen Verbindungen hindeutet. Die ungewohnlichen Stabilitatsverhaltnisse an C-20 der 16,22-Dicarbonyl-Steroide sind vermutlich auf ...
Y. Mazur, F. Sondheimer
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Chemical Reviews, 2021
This Review describes the development of strategies for carbonyl-olefin metathesis reactions relying on stepwise, stoichiometric, or catalytic approaches. A comprehensive overview of currently available methods is provided starting with Paternò-Büchi cycloadditions between carbonyls and alkenes, followed by fragmentation of the resulting oxetanes ...
Haley Albright +6 more
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This Review describes the development of strategies for carbonyl-olefin metathesis reactions relying on stepwise, stoichiometric, or catalytic approaches. A comprehensive overview of currently available methods is provided starting with Paternò-Büchi cycloadditions between carbonyls and alkenes, followed by fragmentation of the resulting oxetanes ...
Haley Albright +6 more
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Andrologia, 2019
The cryopreservation of sperm is a well established technique that plays an essential role in dissemination of elite germplasm of livestock. Despite having numerous advantages, the cryopreservation induces certain stresses on sperm including structural and functional damages leading to impaired sperm quality and fertility, which might be associated ...
Shabir Ahmad Lone +3 more
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The cryopreservation of sperm is a well established technique that plays an essential role in dissemination of elite germplasm of livestock. Despite having numerous advantages, the cryopreservation induces certain stresses on sperm including structural and functional damages leading to impaired sperm quality and fertility, which might be associated ...
Shabir Ahmad Lone +3 more
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Carbonyl polyhedra in crystalline carbonyl clusters
Transition Metal Chemistry, 1992An attempt has been made to elucidate the low-energy modes of vibration of the icosahedral envelope of carbonyl ligands in the series of dodecacarbonyl clusters, Co4(CO)12, RhCo2(CO)12, Ir2Co2(CO)12, and Fe3(CO)12, from an examination of their crystalline structures. It was hoped that this approach would give additional evidence necessary for a clearer
Brian F. G. Johnson, Roderick Edmonds
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Current Drug Metabolism, 2010
Enzymatic carbonyl reduction means the formation of a hydroxy function out of a ketone or aldehyde moiety and applies for the metabolism of physiological (endogenous) or xenobiotic (exogenous) molecules. As for endogenous substrates, carbonyl reduction is often part of a reversible oxidoreductase process and involves the activation or inactivation of ...
Petra, Malátková +2 more
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Enzymatic carbonyl reduction means the formation of a hydroxy function out of a ketone or aldehyde moiety and applies for the metabolism of physiological (endogenous) or xenobiotic (exogenous) molecules. As for endogenous substrates, carbonyl reduction is often part of a reversible oxidoreductase process and involves the activation or inactivation of ...
Petra, Malátková +2 more
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Binuclear Cyclopentadienylcobalt Carbonyls: Comparison with Binuclear Iron Carbonyls
Journal of the American Chemical Society, 2005The binuclear cyclopentadienylcobalt carbonyls Cp2Co2(CO)n (n = 3, 2, 1; Cp = eta5-C5H5) are studied by density functional theory using the B3LYP and BP86 functionals. The experimentally known monobridged isomer Cp2Co2(CO)2(mu-CO) and the tribridged isomer Cp2Co2(mu-CO)3 of Cp2Co2(CO)3 with formal Co-Co single bonds are found to be similar in energy ...
Hongyan, Wang +3 more
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Organic Letters
Presented herein is the exploration of a novel non-covalent anion-carbonyl (X-···C═O) interaction using aromatic imides as receptors and halides as lone pair donors. Combined theoretical calculations and experimental methods including 13C NMR, IR, and crystallographic analyses were performed to provide the physical origin and experimental evidence of ...
Jun Zhu +5 more
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Presented herein is the exploration of a novel non-covalent anion-carbonyl (X-···C═O) interaction using aromatic imides as receptors and halides as lone pair donors. Combined theoretical calculations and experimental methods including 13C NMR, IR, and crystallographic analyses were performed to provide the physical origin and experimental evidence of ...
Jun Zhu +5 more
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Science, 1941
When the metal carbonyls were first discovered, their properties were startling because they seemed to violate nearly all the previously recognized generalizations of chemistry. Even to-day the existence of the carbonyls is not particularly emphasized in elementary courses of chemistry because it is rather hard to reconcile them with the first ...
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When the metal carbonyls were first discovered, their properties were startling because they seemed to violate nearly all the previously recognized generalizations of chemistry. Even to-day the existence of the carbonyls is not particularly emphasized in elementary courses of chemistry because it is rather hard to reconcile them with the first ...
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Metal Carbonyl Catalyzed Carbonylation Reppe Reactions
1970Carbon monoxide reacts with unsaturated compounds (or components which are able to form unsaturated compounds) and a nucleophilic compound containing a mobile H-atom in the presence of certain metal carbonyls to yield carboxylic acid derivatives. This reaction is called carbonylation or, if acetylenes or olefins are reacted with carbon monoxide and ...
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