Zobrazeno 1 - 10
of 76
pro vyhledávání: '"J. A. Lepoivre"'
Autor:
C. Gorrebeeck, J. A. Lepoivre, M. Spanoghe, D. Lanens, Frank C. Alderweireldt, Roger Dommisse, Guy L. F. Lemiere
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 110:231-235
Polyacrylamide gel beads with monomer concentrations ranging from 5 to 30% and with constant degree of cross-linking (5%) were prepared. Dried beads were swollen in buffered HLAD/NAD+ solutions and placed in a water-immiscible organic solution of sub
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:855-859
The U.V. and I.R. spectral data of 4-aryl-3,5-diethoxycarbonyl-2,6-dimethyl-1,4-dihydropyridines with different aryl substituents are discussed. The λmax values of the long-wavelength absorption band in the U.V. spectra show a similar solvent depend
Autor:
E. M. Merckx, J. J. Van Luppen, Roger Dommisse, J. A. Lepoivre, Frank C. Alderweireldt, E. L. Esmans
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 90:49-56
The 1,3-dipolar addition reaction of acrylonitrile to the betaine 1-phenyl or methyl-3-oxidopyridinium is not so highly regioselective as generally assumed. New regioisomers are isolated. Their structures are proven by mass spectroscopy and proton-an
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 86:633-638
The reaction kinetics of the redox system chloranil-1, 4-dihydropyridine (of the Hantzsch-ester type) is monitored by U. V.-spectroscopy. A possible reaction mechanism is discussed. Evidence for an ion-pair formation in a purely second-order reaction
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 88:807-815
The kinetics of the coupled-substrate coenzyme recycling system, which is a very useful enzymatic method for preparative purposes, are studied. A full steady-state rate equation and a much more useful initial rate equation are elaborated. These equat
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 89:67-70
The title compound is synthesized from 2,3-0-isopropylidene ribofuranosylamine and 1-(2, 4-dinitrophenyl)-3-benzoylpyridiniura chloride in a Zincke type synthesis.
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 89:389-398
Values for the rate constants of the catalytic step HLAD-NADH + ketone → HLAD-NAD+ alcohol in the HLAD catalyzed reduction of some 2-alkyl cyclohexanones, geminal dimethyl cyclohexanones, cycloalkanones and bicyclic ketones are presented. Also the
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 87:21-25
The relative magnitude of the lanthanide induced shift (LIS) by Eu(fod)3 for the 19F NMR spectra of the CF3 group of diastereomeric (R)-(+)-α-methoxy-α-trifluoro methylphenylacetate esters [(R)-(+)-MTPA esters] of stereomeric 2- and 3- substituted
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:689-695
The sodium borohydride reduction of 1,2,4-trisubstituted 1,2-dihydropyridines yields Δ3- and Δ4-tetrahydroderivatives. The predominant derivative in most of the cases is the Δ3-derivative although starting from the corresponding pyridinium ions on
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 86:267-271
1H-NMR and 13C-NMR spectral data of 4-aryl-3, 5-diethoxycarbonyl-2, 6-dimethyl-1,4-dihydropyridines (Hantzsch-esters) are given. The chemical shift variations resulting from the different substituents are related to Hammett σ- and σ+-constants. The