Canadian Science Publishing

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Total synthesis of indole and dihydroindole alkaloids. XVI. Derivatives of vinblastine and vincristine: change of functionality in the vindoline unit
Canadian Science Publishing - Tập 56 Số 19 - Trang 2560-2566 - 1978
James P. Kutney, John Balsevich, Toshio Honda, Ping-Huang Liao, Herman P. M. Thieelier, Brian R. Worth
Studies describing the preparation of various derivatives of vinblastine and vincristine are presented. Vindoline (3) is transformed into a series of derivatives and the latter via Polonovski-type coupling with catharanthine (2) provide the bisindole alkaloid derivatives of the vinblastine series. Selective Jones' oxidation transforms the vinblastine family into the corresponding vincristine deriv... hiện toàn bộ
13C magnetic resonance spectra of some isoquinoline alkaloids and related model compounds
Canadian 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 spectroscopy to distinguish between diastereomeric pairs of b... hiện toàn bộ
Enzymatic oxidation of cyclopropylbenzene: structures of new metabolites and possible mechanistic implications
Canadian 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 and 1 g L–... hiện toàn bộ
A novel type of active site at the surface of crystalline SiO2 (a-quartz) and its possible impact on pathogenicity
Canadian 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 temperature. The abundance of this site... hiện toàn bộ
SUR LA FLAMME FROIDE DE L'ETHER
Canadian Science Publishing - Tập 29 Số 1 - Trang 76-88 - 1951
Ludovic Ouellet, Cyrias Ouellet
not available
QUANTITATIVE ANALYSIS OF COMBUSTION PRODUCTS BY GAS CHROMATOGRAPHY: THE OXIDATION OF A RICH n-PENTANE–AIR MIXTURE IN A FLOW SYSTEM
Canadian Science Publishing - Tập 38 Số 9 - Trang 1455-1466 - 1960
Samuel Sandler, Jill Beech
A description is given of an apparatus suitable for investigations of the oxidation and decomposition reactions of volatile hydrocarbon vapors in a flow system. Most of the reaction products are analyzed quantitatively by gas chromatography in a single-stage process involving a simple column-temperature programming technique. The products of the oxidation of a rich mixture of n-pentane and air in ... hiện toàn bộ
AN INVESTIGATION OF THE GAS-PHASE OXIDATION OF ACETALDEHYDE BY MEANS OF A RAPID-SCANNING MASS SPECTROMETER
Canadian 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 the inducti... hiện toàn bộ
INFLUENCE DE GAZ ETRANGERS SUR LA FLAMME FROIDE DE L'ETHER
Canadian Science Publishing - Tập 29 Số 11 - Trang 986-995 - 1951
Ludovic Ouellet, Cyrias Ouellet
not available
Phosphorus pentasulfide as a mild, selective reagent for the reduction of sulfoxides to sulfides
Canadian 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 selenoxides but is ineffective in reducing sulfones,... hiện toàn bộ
Alchemists' Gold, Hg2.86 Asf6; An X-Ray Crystallographic Study of A Novel Disordered Mercury Compound Containing Metallically Bonded Infinite Cations
Canadian Science Publishing - Tập 52 Số 5 - Trang 791-793 - 1974
I. D. Brown, Brent D. Cutforth, C. Davies, R. J. Gillespie, Peter R. Ireland, J. E. Vekris
The compound Hg2.86 AsF6 belongs to the tetragonal space group I41/amd with lattice parameters a = 7.538(4) Å, c = 12.339(5) Å, and Z = 4. The structure was refined using 109 symmetry independent reflections by full matrix least-squares refinement to a final R value of 0.079. The structure may be described as consisting of octahedral AsF6− ions arranged on a lattice which contains linear, non-inte... hiện toàn bộ
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