13C magnetic resonance spectra of some isoquinoline alkaloids and related model compoundsCanadian Science Publishing - Tập 54 Số 14 - Trang 2252-2260 - 1976
Donald W. Hughes, Herbert L. Holland, David B. MacLean
The natural abundance 13C nuclear magnetic resonance spectra of a number of isoquinoline alkaloids and related model compounds have been recorded. In almost all cases comparison of the spectra of the alkaloids with those of the model compounds has permitted unambiguous assignment of the alkaloid carbon resonances. The ability of 13C nmr spectrosco...... hiện toàn bộ
Enzymatic oxidation of cyclopropylbenzene: structures of new metabolites and possible mechanistic implicationsCanadian Science Publishing - - 2002
Vu Bui, Minh Kha Nguyễn, Jeff Hansen, John M. Baker, Tomáš Hudlický
Cyclopropylbenzene was subjected to whole-cell fermentation with either Escherichia coli JM109 (pDTG601) or E. coli JM109 (pDTG602), expressing toluene dioxygenase and toluene dioxygenase dihydrodiol dehydrogenase enzymes, respectively. The corresponding metabolites, 3-cyclopropylcyclohexa-3,5-diene-1,2-diol (3) and 3-cyclopropylbenzene-1,2-diol (5) have been isolated in yields of 2.5 an...... hiện toàn bộ
A novel type of active site at the surface of crystalline SiO2 (a-quartz) and its possible impact on pathogenicityCanadian Science Publishing - Tập 69 Số 9 - Trang 1427-1434 - 1991
Dominique Costa, Bice Fubini, Elio Giamello, Marco Volante
A new type of surface site, different from those previously described, which gives rise to a paramagnetic oxygen species upon adsorption of O2 at low temperature, has been found at the surface of crystalline quartz. This site is abundant on freshly cleaved surfaces or on chemically etched ones but absent on crystal growth faces or on samples annealed at high temperatu...... hiện toàn bộ
AN INVESTIGATION OF THE GAS-PHASE OXIDATION OF ACETALDEHYDE BY MEANS OF A RAPID-SCANNING MASS SPECTROMETERCanadian Science Publishing - Tập 35 Số 2 - Trang 115-123 - 1957
L. P. Blanchard, J. B. Farmer, Cyrias Ouellet
A mass spectrometer equipped for continuous sampling and capable of producing 60 spectra per second has been used to follow the oxidation of acetaldehyde at temperatures in the region of 250 °C. In normal slow oxidation peracetic acid was formed and then decomposed into carbon dioxide, methanol, and water. Under flame conditions peracetic acid built up in an autocatalytic manner during th...... hiện toàn bộ
Phosphorus pentasulfide as a mild, selective reagent for the reduction of sulfoxides to sulfidesCanadian Science Publishing - Tập 56 Số 10 - Trang 1423-1428 - 1978
I. W. J. STILL, S. K. Hasan, Kenneth Turnbull
It bas been shown that phosphorus pentasulfide (P4S10) is a mild, effective reagent for the reduction of sulfoxides to sulfides and that this conversion can be achieved selectively in the presence of other reactive groups such as ketone, ester, amide, nitro, and halogen. Phosphorus pentasulfide also appears to be a promising reagent for reducing s...... hiện toàn bộ