نتایج جستجو برای: carbonyl compounds
تعداد نتایج: 237126 فیلتر نتایج به سال:
.................................................................................................................... iii List of publications ..................................................................................................... v Abbreviations ............................................................................................................. ix
چکیده ندارد.
Diazo compounds, boranes, and acyl imines undergo a three-component Mannich condensation reaction under catalyst-free conditions to give the anti β-amino carbonyl compounds in high diastereoselectivity. The reaction tolerates a variety of functional groups, and an asymmetric variant was achieved using the (-)-phenylmenthol as chiral auxiliary in good yield and selectivity. These β-amino carbony...
A one-pot two-step reaction (Knoevenagel condensation - reduction of the double bond) has been developed using calcium hydride as a reductant in the presence of a supported noble metal catalyst. The reaction between carbonyl compounds and active methylene compounds such as methylcyanoacetate, 1,3-dimethylbarbituric acid, dimedone and the more challenging dimethylmalonate, affords the correspond...
The direct α-vinylation of carbonyl compounds to form a quaternary stereocenter is a challenging transformation. It was discovered that δ-oxocarboxylic acids can serve as masked vinyl compounds and be unveiled by palladium-catalyzed decarbonylative dehydration. The carboxylic acids are readily available through enantioselective acrylate addition or asymmetric allylic alkylation. A variety of α-...
A novel copper-catalyzed oxidative desulfurization reaction of thiocarbonyl compounds, using molecular oxygen as an oxidant and leading to formation of carbonyl compounds, has been developed, and the utility of the process is demonstrated by its application to the preparation of a carbonyl-18O labeled sialic acid derivative.
Carbonyl compounds in boreal coniferous forest air in Hyytiälä, Southern Finland H. Hellén, H. Hakola, A. Reissell , and T. M. Ruuskanen Finnish Meteorological Institute, Sahaajankatu 20 E, 00880 Helsinki, Finland University of Helsinki, Department of Physical Sciences, Finland University of Helsinki, Department of Chemistry, Finland Received: 16 April 2004 – Accepted: 11 May 2004 – Published: ...
New CO-releasing molecules, CO-RMs, based on indenyl iron carbonyls have been identified. Half-lives for carbon monoxide (CO) release, (1)H NMR, (13)C NMR, IR, mass spectra, elemental analysis and biological data have been determined for the compounds. Limited correlations have been made between half-lives and ΔG(‡) for CO release and spectroscopic parameters, ν(CO) and δ((13)CO). X-ray structu...
Various cyclic carbonyl compounds were concisely synthesized by carbonylative cyclization of haloarenes bearing nucleophilic moieties under Pd catalysis. A broad substrate scope and a feasible large-scale synthesis clearly demonstrate the high applicability of the reaction as a general, user-friendly method for access to cyclic carbonyl compounds.
A new copper-catalyzed oxidative difunctionalization of enol ethers with α-amino carbonyl compounds and hydroperoxides is developed. This method is experimentally simple while allowing for regioselective access to 2-amino-3,4-dioxy carbonyl compounds in good yields, and represents the first example of alkene oxyalkylation through C(sp(3))-H functionalization.
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