Showing papers in "Canadian Journal of Chemistry in 1960"
TL;DR: In this paper, it was shown that the electric field at a particular nucleus arising from polar groups in other parts of a molecule can lead to chemical shifts proportional to the first power of the field strength.
Abstract: It is shown that the electric field at a particular nucleus arising from polar groups in other parts of a molecule can lead to chemical shifts proportional to the first power of the field strength....
675 citations
TL;DR: The soluble poly-β-D-glucan from oats has been subjected to degradation by two different types of enzymes as mentioned in this paper, i.e., cellulase and trisaccharide.
Abstract: The soluble poly-β-D-glucan from oats has been subjected to degradation by two different types of enzymes. "Cellulase" converts the polysaccharide to a trisaccharide, 4-O-β-D-lamina-ribiosyl-D-gluc...
210 citations
TL;DR: In this article, a study of the kinetics of the initiation and propagation reactions in the polymerization of styrene by butyllithium in benzene solution has been made.
Abstract: A study of the kinetics of the initiation and propagation reactions in the polymerization of styrene by butyllithium in benzene solution has been made. The initiation has been shown to be first ord...
171 citations
TL;DR: In this paper, the high-resolution proton resonance spectrum of formamide has been measured and analyzed, and Quadrupole broadening of the resonance signals due to the N14 nucleus was eliminated by substitution of th...
Abstract: The high-resolution proton resonance spectrum of formamide has been measured and analyzed. Quadrupole broadening of the resonance signals due to the N14 nucleus was eliminated by substitution of th...
152 citations
TL;DR: In this paper, the reaction of N and S-substituted thiosemicarbazones with Cu(I) was examined and no complexes were formed when the S atom was substituted and when the N2 hydrogen atom was replaced by Me.
Abstract: Reactions of N- and S-substituted thiosemicarbazones with Cu(I) have been examined. No complexes are formed when the S atom is substituted and(or) when the N2 hydrogen atom is replaced by Me. 4,4-D...
125 citations
TL;DR: In this article, a rapid technique was developed for dissolving successive thin layers of metal from the surface of an aluminum foil: viz. electrochemical oxidation at constant voltage in aqueous ammonium citrate, followed by removal of the oxide film in a phosphoric acid -chromic oxide solution.
Abstract: A rapid technique has been developed for dissolving successive thin layers of metal from the surface of an aluminum foil: viz. electrochemical oxidation at constant voltage in aqueous ammonium citrate, followed by removal of the oxide film in a phosphoric acid – chromic oxide solution. Due to the highly protective nature of the aluminum oxide film, this two-step process enables very uniform surface layers of metal as thin as 1 μ/cm2 to be removed. The total weight of aluminum dissolved increases with the applied anodic voltage at a rate of 0.30 μg cm−1 volt−1 (approximately 11 A per volt) over the range 0–150 volts. The technique should be sufficiently sensitive to study the depth of penetration in aluminum of radioactive ions with kinetic energies as low as a few kiloelectron volts.An approximate value for the range of Na24 recoil atoms from the Al27 (n,α) reaction was obtained. A more extensive application to range studies is given in the next paper.
122 citations
TL;DR: Cells of Candida albicans, a pathogenic yeast, have been shown to contain, in addition to chitin, a glucan and a mannan in the approximate ratio of 1.00:0.64.
Abstract: Cells of Candida albicans, a pathogenic yeast, have been shown to contain, in addition to chitin, a glucan ([α]D − 30°) and a mannan ([α]D + 78°) in the approximate ratio of 1.00:0.64. The two poly...
112 citations
TL;DR: In this paper, the effect of solvent upon a wide variety of equilibria, reaction rates, and spectral shifts may be described by the equation log (ksolvent/kethanol)
Abstract: It is shown that the effect of solvent upon a wide variety of equilibria, reaction rates, and spectral shifts may be described by the equation log (ksolvent/kethanol) = SR. S is a constant related to the polarity of the solvent and R is a measure of the sensitivity of the system to change in solvent polarity. Tables of S and R are included.
92 citations
TL;DR: In this paper, a study was made of the time variations of π-A isotherms of stearic acid films at air/water interfaces using an automatic recording surface balance of the vertical pull type.
Abstract: A study has been made of the time variations of π–A isotherms of stearic acid films at air/water interfaces using an automatic recording surface balance of the vertical pull type. The existence of ...
87 citations
TL;DR: In this paper, the spectra of tiglic and angelic acids and their methyl esters were determined and analyzed by first-order perturbation theory and the magnitudes of the long-range coupling constants were found.
Abstract: The spectra of tiglic and angelic acids and their methyl esters have been determined and analyzed by first-order perturbation theory. The magnitudes of the long-range coupling constants were found ...
87 citations
TL;DR: In this paper, gas-liquid partition chromatography has been used to separate all of the possible tetra- and tri-O-methyl ethers of methyl α- and β-D-glucopyranoside.
Abstract: Gas–liquid partition chromatography has been used to separate all of the possible tetra- and tri-O-methyl ethers of methyl α- and β-D-glucopyranoside. Anomeric methyl glycosides of each isomer were well separated except those of 3,4,6-tri-O-methyl-D-glucose. The six di-O-methyl-D-glucopyranoses were partially resolved as their methyl glycosides. The four possible mono-O-methyl-D-glucopyranoses were completely resolved after conversion to the corresponding mono-O-methyl-penta-O-acetyl-D-glucitols, a series of compounds which, except for the 6-O-methyl isomer, have not been reported previously. Quantitative estimations of mixtures containing varying amounts of methyl-2,3,4-tri-O-methyl-β-D-xylopyranoside and methyl-2,3,4,6-tetra-O-methyl-α-D-glucopyranoside showed that molar ratios of components in a mixture could be determined with a mean deviation of ±0.5 in 100.
TL;DR: In this paper, it was shown that gas chromatographic peaks have the form of normal distribution curves and a mathematical treatment has been developed which permits the calculation of the areas of these curves.
Abstract: Gas chromatographic peaks were demonstrated to have the form of normal distribution curves. A mathematical treatment has been developed which permits the calculation of the areas of these curves fr...
TL;DR: In this article, the fundamental factors which determine isotope separation factors on adsorbents, based on hydrogen and deuterium isotherms reported in Part I, were investigated, and the results showed that the horizontal zero-point vibrations of the adsorbed species in some cases constitute an important contributing factor.
Abstract: An investigation has been made of the fundamental factors which determine isotope separation factors on adsorbents, based on hydrogen and deuterium isotherms reported in Part I. Through the use of a semiempirical thermodynamic approach, the binary separation factors α have been related to the single component isotherms (p = f(v)), and these in turn broken down into a number of terms involving the isosteric heat of adsorption q, temperature T, and surface coverage. If the less important contributions are neglected, the treatment leads to the following sequence of approximate relations:where e0 = total vibrational zero-point energy of adsorbed molecules.The rigorous form of equation [I] agrees well with the experimental results, and semi-quantitative agreement with the data is shown by equation [II]. A qualitative discussion of [III] is given. It is suggested that the horizontal zero-point vibrations of the adsorbed species in some cases constitute an important contributing factor in addition to the vertica...
TL;DR: On a mesure les spectres infrarouges, entre 2 and 30μ, de l'acide sulfurique and de ses solutions aqueuses a diverses concentrations de meme que celui de l 'acide deutere, D2SO4 as discussed by the authors.
Abstract: On a mesure les spectres infrarouges, entre 2 et 30 μ, de l'acide sulfurique et de ses solutions aqueuses a diverses concentrations de meme que celui de l'acide deutere, D2SO4. On a aussi mesure a ...
TL;DR: The infrared spectra of a number of amine hydrohalides have been measured in the lithium fluoride region as mentioned in this paper, where hydrogen bonding and the torsional oscillations of the groups influence these spectra.
Abstract: The infrared spectra of a number of amine hydrohalides have been measured in the lithium fluoride region.Hydrogen bonding and the torsional oscillations of the groups influence these spectra charac...
TL;DR: The infrared spectra for the di- and hexa-hydrates of uranyl nitrate, for anhydrous uranyl acetate, and for sodium zinc uranyl ionate hexahydrate have been obtained using the potassium bromide pre-treatment as mentioned in this paper.
Abstract: The infrared spectra for the di- and hexa-hydrates of uranyl nitrate, for anhydrous uranyl acetate, and for sodium zinc uranyl acetate hexahydrate have been obtained using the potassium bromide pre...
TL;DR: In this paper, the arrangements of the electron pairs in the valency shell of a central atom of a polyatomic molecule can be predicted by considering the equilibrium arrangements of similar polyatomic molecules.
Abstract: It is proposed that the arrangements of the electron pairs in the valency shell of a central atom of a polyatomic molecule can be predicted by considering the equilibrium arrangements of similar pa...
TL;DR: A simple electrostatic accelerator capable of producing a monoenergetic beam of alkali metal ions at energies up to 100 kev has been used to study the range of Cs137 ions in aluminum as a function of energy.
Abstract: A simple electrostatic accelerator capable of producing a monoenergetic beam of alkali metal ions at energies up to 100 kev has been used to study the range of Cs137 ions in aluminum as a function of energy. The median range (RM) increases linearly with energy as predicted from the Bohr–Nielsen equation, but has a value about twice that predicted by this equation. Furthermore, the observed straggling about the mean value is not Gaussian in shape, but consists of an asymmetric peak with a pronounced exponential "tail". The possible significance of these results is discussed. Preliminary results are given for the range of 30-kev Rb86 and Na21 ions in aluminum.
TL;DR: The ultraviolet absorption spectra of aliphatic ketones in aqueous sulphuric acid have been followed as the acid strength is increased from 0 to 98% as discussed by the authors.
Abstract: The changes in the ultraviolet absorption spectra of aliphatic ketones in aqueous sulphuric acid have been followed as the acid strength is increased from 0 to 98%. With increase in strength up to ...
TL;DR: In this article, the electrode potential of the nickel oxide electrode has been determined as a function of water and solute activity in aqueous solutions of potassium hydroxide, which is the same as the potential of a polysilicon battery.
Abstract: The electrode potential of the nickel oxide electrode has been determined as a function of water and solute activity in aqueous solutions of potassium hydroxide. The electrode, which was charged to...
TL;DR: In this paper, the wavelengths of minimum specular reflectivity (at 11° incidence) due to interference were determined using a spectrophotometer for a series of films formed on chemically polished niobium.
Abstract: The wavelengths of minimum specular reflectivity (at 11° incidence) due to interference were determined using a spectrophotometer for a series of films formed on chemically polished niobium. With a value of the refractive index n = 2.46 ± 1% at 4358 A wavelength by the Abeles method (reported elsewhere), the spectrophotometric data give the refractive index as a function of the wavelength λ, n = 2.26 + 0.398/(λ/103 A − 2.56)1.2. To analyze the spectrophotometric results, an auxiliary measure of thickness was required (though, with the chart given below, the thickness of a film may be determined directly from spectrophotometric measurements alone). A combination of measurements of the a-c. capacity and of the charge required to form the films gives a suitable measure of thickness (in terms of ρ/e, where e = dielectric constant and ρ = density) which is not dependent on a knowledge of the true surface area. The spectrophotometric data provide a calibration of this measure of thickness and thus give e/ρ. Wit...
TL;DR: In this article, a fractionation according to molecular size has been achieved by development of oligosaccharide mixtures with water on columns of neutral salt forms of sulphonic acid type ion exchange resins.
Abstract: Fractionation according to molecular size has been achieved by development of oligosaccharide mixtures with water on columns of neutral salt forms of sulphonic acid type ion-exchange resins. The me...
TL;DR: The seed oil of Tragopogonporrifolius L. was found to contain about 4% of conjugated diene hydroxy fatty acids, identified as 9-hydroxy-10,12- and 13-hydroxyl-9,11-octadecadienoic acids.
Abstract: The seed oil of Tragopogonporrifolius L. was found to contain about 4% of conjugated diene hydroxy fatty acids, identified as 9-hydroxy-10,12- and 13-hydroxy-9,11-octadecadienoic acids. On dehydrat...
TL;DR: 9-Fluorenylpotassium and 9,9-fluorenyldipotassium have been prepared from the reaction of potassium metal with fluorene in dioxane and upon reaction with alkyl and aralk...
Abstract: 9-Fluorenylpotassium and 9,9-fluorenyldipotassium have been prepared from the reaction of potassium metal with fluorene in dioxane. These organometallic compounds upon reaction with alkyl and aralk...
TL;DR: In this article, a series of trifluoroacetophenones and five phenyltrifluoromethyl carbinols have been synthesized and their ionization constants in water measured.
Abstract: A series of five trifluoroacetophenones and five phenyl trifluoromethyl carbinols have been synthesized and their ionization constants in water measured. They are the unsubstituted, p-methoxy, p-me...
TL;DR: In this paper, the system of bond and group energies described in Part I has been extended and applied to certain compounds containing sulphur and oxygen, such as alkanethiols, thiaalkanes, and dithiaalkane.
Abstract: The system of bond and group energies described in Part I has been extended and applied to certain compounds containing sulphur and oxygen. The substances treated are the alkanethiols, the thiaalkanes, and the dithiaalkanes. The bond additivity scheme enables reliable values for heats of formation, combustion, atomization, and vaporization to be calculated for these compounds.A similar treatment has been applied to the data for alcohols, ethers, and alkyl peroxides.
TL;DR: The infrared absorption spectra of the adducts formed between urea and hydrocarbons from n-heptane to n-hexadecane have been measured in the range 600 cm−1 to 4000
Abstract: The infrared absorption spectra of the adducts formed between urea and hydrocarbons from n-heptane to n-hexadecane have been measured in the range 600 cm−1 to 4000 cm−1. From a consideration of the...
TL;DR: In this paper, the production of vibrationally excited oxygen molecules in the flash photolysis of nitrogen peroxide and ozone has been studied in the case of nitro peroxide.
Abstract: Observations on the production of vibrationally excited oxygen molecules in the flash photolysis of nitrogen peroxide and of ozone have extended previous work on these systems. In the case of nitro...
TL;DR: In this paper, the structures of III and IV were established by infrared spectroscopy and by their reaction with sodium methoxide, and the exo-tosyloxy group of the monoacetate of III resists replacement by iodide ion.
Abstract: Reaction of 1,4;3,6-dianhydro-D-glucitol (isosorbide) with an equimolar amount of tosyl chloride in pyridine gave a fourfold greater yield of the endo-5-tosylate (IV) than of the exo-2-tosylate (III). Compound III reacted about 1.4 times more rapidly with tosyl chloride than did IV. The structures of III and IV were established by infrared spectroscopy and by their reaction with sodium methoxide. The exo-tosyloxy group of the monoacetate of III resists replacement by iodide ion.
TL;DR: The ionization and dissociation of chlorine, bromine, iodine, iodine monochloride, and iodine monobromide by electron impact have been studied in a mass spectrometer which uses a monoenergetic elec...
Abstract: The ionization and dissociation of chlorine, bromine, iodine, iodine monochloride, and iodine monobromide by electron impact have been studied in a mass spectrometer which uses a monoenergetic elec...