Showing papers in "Canadian Journal of Chemistry in 1955"
TL;DR: In this paper, it was discovered that olefinic double bonds are readily oxidized in an aqueous solution of periodate which contains only catalytic amounts of permanganate.
Abstract: It was discovered that olefinic double bonds are readily oxidized in an aqueous solution of periodate which contains only catalytic amounts of permanganate. The data suggest that in the effective p...
361 citations
TL;DR: In this article, the simple semi-empirical molecular orbital method was applied to saturated hydrocarbons in three different approximations, and electronic charge distribution diagrams were obtained.
Abstract: The simple semiempirical molecular orbital method was applied to saturated hydrocarbons in three different approximations. Electronic charge distribution diagrams were obtained. Characteristic diff...
152 citations
TL;DR: The steady-state hypothesis for enzyme systems is discussed in this paper, and the conditions under which the steady state equations will be valid over the main course of the reaction are obtained.
Abstract: The steady-state hypothesis is discussed for enzyme systems, and the conditions under which the steady-state equations will be valid over the main course of the reaction are obtained. It is shown t...
114 citations
TL;DR: In this paper, a method for preparing thin films for use in beta-spectrometry and 4π-counting is described, made of polyvinylchloride-acetate copolymer.
Abstract: A new method for preparing thin films for use in beta-spectrometry and 4π-counting is described. These films, made of polyvinylchloride-acetate copolymer are readily prepared with superficial densities as low as 1 μgm. per cm.2 The films have good tensile strength and show excellent resistance to acids, alkalies, and many organic reagents. The thickness of the films may be determined (a) gravimetrically, (b) radiometrically, and (c) optically either by transmission or reflection. The films can be made conducting by distilling a thin gold layer on to them. The thickness of the gold layer can be determined spectrophotometrically.
110 citations
TL;DR: The temperature dependence of the rates of three reactions in solution which the Arrhenius equation fails to express has been analyzed in terms of equations involving higher powers of the temperatu....
Abstract: The temperature dependence of the rates of three reactions in solution which the Arrhenius equation fails to express has been analyzed in terms of equations involving higher powers of the temperatu...
101 citations
TL;DR: The periodate-permanganate oxidation of a terminal methylene group can be made to produce formaldehyde in high although not quantitative yield as discussed by the authors, since the yields compare favorably with those obtaine...
Abstract: The periodate–permanganate oxidation of a terminal methylene group can be made to produce formaldehyde in high although not quantitative yield. Since the yields compare favorably with those obtaine...
70 citations
TL;DR: In this paper, the absorption spectrum of hydrogen peroxide was re-examined with a prism instrument in the region 1.5 to 25 µm, and a pair of well-resolved perpendicular bands arising from torsional oscillation of the...
Abstract: The absorption spectrum of hydrogen peroxide was re-examined with a prism instrument in the region 1.5 to 25 μ. A pair of well-resolved perpendicular bands arising from torsional oscillation of the...
70 citations
TL;DR: In this article, the Raman spectrum of furfural has been obtained photoelectrically in the liquid over a temperature range of 50° and in solution and the infrared spectrum for the solid, the liquid (...
Abstract: The Raman spectrum of furfural has been obtained photoelectrically in the liquid over a temperature range of 50° and in solution. The infrared spectrum has been obtained for the solid, the liquid (...
69 citations
TL;DR: In this article, the solubilities of synthetic basic calcium phosphate precipitates in carbon dioxide free aqueous systems were studied over a wide range of conditions and the pH of the suspensions and the calcium and...
Abstract: The solubilities of synthetic basic calcium phosphate precipitates in carbon dioxide free aqueous systems were studied over a wide range of conditions. The pH of the suspensions and the calcium and...
59 citations
TL;DR: The rates of exchange of acetate, concurrent with anomerization, between the C1-acetoxy groups of the pentaacetates (0.05 m) of D-glucose and D-mannose and stannic trichloride acetate ( 0.05m) in chl...
Abstract: The rates of exchange of acetate—concurrent with anomerization—between the C1-acetoxy groups of the pentaacetates (0.05 M) of D-glucose and D-mannose and stannic trichloride acetate (0.05 M) in chl...
59 citations
TL;DR: The ionization potentials of ethyl, isopropyl, and propargyl radicals have been measured by electron impact on radicals produced by thermal decomposition of appropriate compounds.
Abstract: The ionization potentials of ethyl, isopropyl, and propargyl radicals have been measured by electron impact on radicals produced by thermal decomposition of appropriate compounds. The values are:et...
TL;DR: In this article, the standard intensities of the Raman bands of CH3CN, CD3CN and CD3CCl3 have been obtained for the liquids with a photoelectric, grating spectrometer.
Abstract: The standard intensities of the Raman bands of CH3CN, CD3CN, CH3CCl3 and CD3CCl3 have been obtained for the liquids with a photoelectric, grating spectrometer. The intensity sum rules for isotopic homologues are valid within the experimental error. The infrared spectra of CD3CN and CD3CCl3 have been obtained in the liquid phase and in the vapor phase. A definitive assignment of v11(e) has been made for methyl chloroform.
TL;DR: The infrared spectra of fourteen organic esters of phosphorus containing dimethylamino groups and two esters containing diethylamin groups have been examined over the region 5000 to 670 cm as mentioned in this paper.
Abstract: The infrared spectra of fourteen organic esters of phosphorus containing dimethylamino groups, and two esters containing diethylamino groups have been examined over the region 5000 to 670 cm.−1 (2 ...
TL;DR: On heating mixtures of a platinum metal with an alkali carbonate in different ratios and at different temperatures in an oxygen stream, two kinds of compounds are formed: cubic compounds Nax... as mentioned in this paper.
Abstract: On heating mixtures of a platinum metal with an alkali carbonate in different ratios and at different temperatures in an oxygen stream, two kinds of compounds are formed:(1) the cubic compounds Nax...
TL;DR: Two-body interactions between glass spheres of diameters a1 and a2 caused by velocity gradients vary with a 1/a2 as mentioned in this paper. But when 1 1 /a 2 ≈ 2, well-defined collisions similar to those previously reported for...
Abstract: Two-body interactions between glass spheres of diameters a1 and a2 caused by velocity gradients vary with a1/a2. When 1 < a1/a2 < 2, well-defined collisions similar to those previously reported for...
TL;DR: In this paper, the heat-coverage curve and the isotherm appear to be indicative of a high degree of homogeneity of the adsorbing surface of the krypton surface.
Abstract: Calorimetric heats have been determined at −183 °C for the adsorption of krypton on a highly graphitized sample of carbon black This adsorption system is of particular interest because of the extreme step-wise nature of the isotherm Both the heat-coverage curve and the isotherm appear to be indicative of a high degree of homogeneity of the adsorbing surface
TL;DR: In this article, various reactions of cyanic acid and the cyanate ion have been examined, and it was shown that in the presence of added hydrochloric or nitric acid, cyanate decomposes quantitatively according to the equation: HNCO.
Abstract: Various reactions of cyanic acid and the cyanate ion have been examined. Cyanic acid, in the presence of added hydrochloric or nitric acid, decomposes quantitatively according to the equation: HNCO...
TL;DR: The hemicellulose prepared from wheat bran by alkaline extraction was an acidic polysaccharide containing arabinose (50.0%), xylose (38.5%), and uronic acid (9.0%).
Abstract: The hemicellulose prepared from wheat bran by alkaline extraction was an acidic polysaccharide containing arabinose (50.0%), xylose (38.5%), and uronic acid (9.0%). Graded hydrolysis with 0.02 N ox...
TL;DR: The carbohydrate residues in κ-carrageenin are 3,6-anhydro-D-galactose and D-Galactose which are present in nearly equal amounts.
Abstract: The carbohydrate residues in κ-carrageenin are 3,6-anhydro-D-galactose and D-galactose which are present in nearly equal amounts. Tests following fractional precipitation of κ-carrageenin indicate ...
TL;DR: In this article, the authors investigated the mercury photosensitized decomposition of ethylene oxide at room temperature and found that at least two, and probably more than two distinct primary steps occur.
Abstract: Some aspects of the mercury photosensitized decomposition of ethylene oxide at room temperature have been reinvestigated. At least two, and probably more than two, distinct primary steps occur. The...
TL;DR: In this paper, the reaction of the periodate-permanganate reagent with olefinic double bonds was applied to the determination of isopropylidene groups and the oxidation of compounds containing such groups gave a quantitative yield of acetone which could be readily determined by known iodometric and colorimetric procedures.
Abstract: The reaction of the periodate–permanganate reagent with olefinic double bonds was applied to the determination of isopropylidene groups. The oxidation of compounds containing such groups gave a quantitative yield of acetone which could be readily determined by known iodometric and colorimetric procedures. Use of aqueous solutions of pyridine or dioxane as solvent permitted analysis of water-insoluble compounds. The colorimetric determination of acetone was then preferred. This method also allowed a simultaneous estimation of terminal methylene groups. The content of isopropylidene groups of commercial samples of three terpenes of the geraniol type was determined.
TL;DR: The polysaccharide, laminarin, was prepared from the marine alga, Laminaria digitata, and was sulphated with chlorosulphonic acid in pyridine and in liquid sulphur dioxide at temperatures below 0° as mentioned in this paper.
Abstract: The polysaccharide, laminarin, was prepared from the marine alga, Laminaria digitata, and was sulphated with chlorosulphonic acid in pyridine and in liquid sulphur dioxide at temperatures below 0°....
TL;DR: A spectrophotometric study of the ferric thiocyanate system was performed in this article, where the temperature and ionic strength of the solutions were carefully controlled, and suitable precautions were taken against f...
Abstract: A spectrophotometric study of the ferric thiocyanate system is reported. The temperature and ionic strength of the solutions were carefully controlled, and suitable precautions were taken against f...
TL;DR: In this paper, various methods in use for determining the correction for absorption due to the source mount used in a 4π-counter are discussed, and experiments conducted to test the validity of the correction are conducted.
Abstract: The various methods in use for determining the correction for absorption due to the source mount used in a 4π-counter are discussed, and experiments conducted to test the validity of the correction...
TL;DR: In this article, D-Glucose is degraded selectively to di-O-formyl-D-erythrose by oxidation with two moles of lead tetraacetate.
Abstract: D-Glucose is degraded selectively to di-O-formyl-D-erythrose by oxidation with two moles of lead tetraacetate. The ester groups are easily hydrolyzed, giving D-erythrose in an over-all yield of at ...
TL;DR: In this paper, the methyl esters of the fatty acids with 1,3-dipropionoxy acetone diethyl mercaptal were obtained by interesterification.
Abstract: 1,3-Distearoxy acetone and 1,3-dipalmitoxy acetone were prepared by interesterification of the methyl esters of the fatty acids with 1,3-dipropionoxy acetone diethyl mercaptal. The 1,3-diglycerides...
TL;DR: In this paper, the nature of the intermolecular force field of the nitriles is considered on the basis of the electron orbital structure and charge distribution of the Nitrile group.
Abstract: The nature of the intermolecular force field of the nitriles is considered on the basis of the electron orbital structure and charge distribution of the nitrile group. The directional nature of the...
TL;DR: Extractive-free, ash-free sunflower seed heads contained lignin (12.3%), pectin (27.5%), alkali-soluble polysaccharides (8.2%), and α-cellulose (52.0%) as mentioned in this paper.
Abstract: Extractive-free, ash-free sunflower seed heads contained lignin (12.3%), pectin (27.5%), alkali-soluble polysaccharides (8.2%), and α-cellulose (52.0%). Pectin and polysaccharides were separated by...
TL;DR: In this article, the attractive force between a pyrex glass bead and a plate has been measured using a sensitive pendulum-type apparatus, and the observed results have been shown to be consistent with the theoretical London van der Waals interaction.
Abstract: The attractive force between a pyrex glass bead and plate has been measured using a sensitive pendulum-type apparatus. The force required for separation of the bead from the plate has been shown to be strongly time dependent, a phenomenon which appears not to have been reported previously for adhesions in gaseous media. The observed results have been shown to be consistent with the theoretical London – van der Waals interaction. The estimated value of the London force constant is compared with that obtained by other workers.