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Digitale Medien

Ba(OH)2 as catalyst in organic reactions: I. Nature of active sites in the michael addition (1985)

Sinisterra, J. V. ; Garcia-Blanco, F. ; Iglesias, M. ; [weitere]

Springer

Reaction kinetics and catalysis letters 27 (1985), S. 263-267

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Details

ISSN: 1588-2837

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: Abstract С целью определения природы активных центров прововодились эксперименты селективного отравления активированной гидроокиси бария, катализирую-шей аддицию Михаэля в случае этилмалоната и халкона в этаноле. Было найдено, что каталитическая активность катализатора C-200 приписыва-ется сильным основным центрам, титрируемым с помошью TBMPHE.

Notizen: Abstract In order to determine the nature of active sites that act in the Michael addition of ethyl malonate to chalcone in EtOH, catalyzed by activated barium hydroxide, selective poisoning experiments have been carried out. It has been found that the catalytic activity of the C-200 catalyst is related to the strong basic sites titrated by TBMPHE.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02070454

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Digitale Medien

Binding of pyridoxal-5′-phosphate and pyridoxamine-5′-phosphate: Electrochemical characterization (1989)

Eraso, F. ; Pineda, T. ; Blazquez, M. ; [weitere]

Chichester : Wiley-Blackwell

Journal of Physical Organic Chemistry 2 (1989), S. 448-454

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Details

ISSN: 0894-3230

Schlagwort(e): Organic Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The interaction between pyridoxal-5′-phosphate (PLP) and pyridoxamine-5′-phosphate (PMP) was studied by d.c. and differential pulse polarography. Two reduction waves (or two peaks) were observed. The first wave corresponds to the reduction of the adduct and the second to the reduction of free PLP. The behaviour was similar in analogous Schiff bases. The effects of pH, PMP concentration and the capillary characteristics were studied. The apparent formation constant as a function of the pH was calculated. Thermodynamic parameters were estimated at pH 7 and 0 · 1 M ionic strength. The polarographic and kinetic results show that the overall electrode process appears to be irreversible in a basic medium.

Zusätzliches Material: 4 Ill.