Reactions of α-chloro β-oxo aldehydes with CH-acid anions
摘要:
The reactions of alpha-chloro and alpha,alpha-dichloro beta-oxo aldehydes with carbanions are accompanied by the cleavage of the carbon-carbon bond in the chloro aldehydes and result in formylation of CH-acids. These electrophiles react with carbanions, which are generated in situ from CH-acids in the presence of AcONa in aprotic solvents, to form polyfunctional hydroxy compounds.
Optically Active<i>N</i>,<i>N</i>′-Bis(3-oxobutylidene)diaminatomanganese(III) Complexes as Novel and Efficient Catalysts for Aerobic Enantioselective Epoxidation of Simple Olefins
A novel manganese(III) complex having an opticallyactive N,N′-bis(3-oxobutylidene)diamine ligand with bulky substituents was prepared and characterized crystallographically. In the presence of a catalytic amount of the manganese(III) complex, unfunctionalizedolefins were oxygenated to give opticallyactive epoxides with molecular oxygen by the combined use of several aliphatic aldehydes. Cyclic and
Three novel chiral Schiff Base ligands (H2L) were prepared from the condensation reaction of 3-formyl acetylacetone with the amino acids L-alanine, L-phenylalanine, and L-threonine. X-ray single crystal analyses revealed that the Schiff Base compounds exist as enamine tautomers in the solid state. The molecular structure of the compounds is stabilized by an intramolecular hydrogen bridge between the
Keto−enol tautomerization of 3-formylacetylacetone has been studied by NMR spectroscopy, abinitio, and DFT calculations in the gas phase and continuum solvation. By employing very low temperatures in a freonic solvent, tautomeric and conformational equilibria in the slow exchange regime were analyzed in detail. The β-tricarbonyl compound always adopts a structure with an enolized keto group irrespective