Showing papers in "Canadian Journal of Chemistry in 1975"
TL;DR: The 13C signals of most of the more common sugars and their methyl glycosides have been assigned, based on the α-carbon and β-carbon effects that occur on deuterium substitution.
Abstract: The 13C signals of most of the more common sugars and their methyl glycosides have been assigned, based on the α-carbon and β-carbon effects that occur on deuterium substitution. For pyranoses havi...
557 citations
TL;DR: The utility of tert-butyldiphenylsilyl chloride as a reagent for the protection of hydroxyl groups was explored in this article, where the corresponding tert-BDPSi ethers have much greater stability to acids, and under...
Abstract: The utility of tert-butyldiphenylsilyl chloride as a reagent for the protection of hydroxyl groups was explored. The corresponding tert-BDPSi ethers have much greater stability to acids, and under ...
414 citations
TL;DR: The crystal and molecular structure of bis(π-cyclopentadienyl)titanium dichloride, (C5H5)2TiCl2, has been determined from three dimensional X-ray data as discussed by the authors.
Abstract: The crystal and molecular structure of bis(π-cyclopentadienyl)titanium dichloride, (C5H5)2TiCl2, has been determined from three dimensional X-ray data. The crystals are triclinic with a = 7.882(5),...
217 citations
TL;DR: In this article, the 13C chemical shifts of methyl aldopento- and hexofuranosides and of cyclopentane polyols are evaluated with respect to all combinations of combinations.
Abstract: Assignments for the 13C chemical shifts of methyl aldopento- and hexofuranosides and of cyclopentane polyols are reported, and these chemical shifts are evaluated with respect to all combinations o...
202 citations
TL;DR: In this article, the atomic absorption measurements of zinc hydroxide have been used for evaluation of the solubility at 12.5, 25.0, 50.0 and 75.0 °C from pH 6.7 to pH 13.8.
Abstract: We have made atomic absorption measurements leading to the solubility of zinc hydroxide at 12.5, 25.0, 50.0, and 75.0 °C from pH = 6.7 to pH = 13.8. Results have been used for evaluation of the sol...
199 citations
TL;DR: The triphenylphosphine-carbon tetrahalide (Br, Cl) system transforms N′-benzoyl-N-arylhydrazines into the corresponding hydrazon.
Abstract: The triphenylphosphine – carbon tetrahalide (Br, Cl) system transforms N′-benzoyl-N-arylhydrazines (1), N,N-dimethyl-, and N-methyl-N-phenyl-N′-benzoylhydrazines (3) into the corresponding hydrazon...
166 citations
TL;DR: In this article, the equilibrium constants for hydrate-hemiacetal interconversion in aqueous solution at 25° have been measured for four fluorinated carbonyl compounds: compound, alcohol, K4 (M−1): CF3CHO, C2H5OH, 2.3
Abstract: Equilibrium constants for hydrate–hemiacetal interconversion in aqueous solution at 25° have been measured for four fluorinated carbonyl compounds: compound, alcohol, K4 (M−1): CF3CHO, C2H5OH, 2.3;...
158 citations
TL;DR: In this paper, the spin Hamiltonian parameters of low spin cobalt(II), d7, complexes have been developed to third order in perturbation theory for all reasonable ground states.
Abstract: The theory for the spin Hamiltonian parameters of low spin cobalt(II), d7, complexes has been developed to third order in perturbation theory for all reasonable ground states. Two extensions beyond...
138 citations
TL;DR: In this paper, the bromohydroperoxides of 2-methyl-2-butene and ethylidenecyclohexane with cold methanolic base were treated.
Abstract: Treatment of the bromohydroperoxides of 2-methyl-2-butene and ethylidenecyclohexane with cold methanolic base produces trimethyl- and 4-methyl-3,3-pentamethylene-1,2-dioxetane, 3 and 8. Under these...
116 citations
TL;DR: In this article, the pyrolysis of methane has been studied in a static system at temperatures of 995, 1038, 1068, and 1103 K and pressures from 25 to 700 Torr.
Abstract: The pyrolysis of methane has been studied in a static system at temperatures of 995, 1038, 1068, and 1103 K and pressures from 25 to 700 Torr. It was concluded that the initial stages of the reacti...
109 citations
TL;DR: There have been several studies of the charge transfer photochemistry of aqueous Fe3+ but the complexity of hydrolytic equilibria and the requirement for scavengers to render the primary photochemi... as discussed by the authors.
Abstract: There have been several studies of the charge transfer photochemistry of aqueous Fe3+ but the complexity of hydrolytic equilibria and the requirement for scavengers to render the primary photochemi...
TL;DR: Isothiosemicarbazones, except N2-substituted ones, were found to exist exclusively in the amino structure by means of i.m.r. spectroscopy as discussed by the authors.
Abstract: Isothiosemicarbazones, except N2-substituted ones, were found to exist exclusively in the amino structure by means of i.r. and n.m.r. spectroscopy. The cis configuration (N1cis to N4 about the N2=C...
TL;DR: The partial molal volumes of nonpolar organic molecules (i.e., those having more than three aliphatic carbon atoms per polar hydroxyl, ether, amine, amide, or urea group) in water at 25 °C are given in this article.
Abstract: The partial molal volumes of nonpolar organic molecules (i.e. those having more than three aliphatic carbon atoms per polar hydroxyl, ether, amine, amide, or urea group) in water at 25 °C are given...
TL;DR: The decomposition of EDTA at 200 and 260 °C, NTA at 260 and 293 °C and NTPO at 2.5 °C was described in this paper.
Abstract: The decomposition of ethylenediaminetetraacetic acid (EDTA) in water solution at 200 and 260 °C, nitrilotriacetic acid (NTA) at 260 and 293 °C, and of nitrilotrimethylenephosphonic acid (NTPO) at 2...
TL;DR: In this article, a simple chemical model was used to investigate the mechanisms controlling the distribution of metals between soluble and particulate fractions in natural waters, and the model particulates used were potassium bentonite, hydrous MnO2, and solid humic acid.
Abstract: A simple chemical model was used to investigate the mechanisms controlling the distribution of metals between soluble and particulate fractions in natural waters. The model particulates used were potassium bentonite, hydrous MnO2, and solid humic acid. The soluble species in natural waters were modelled by soluble humic acid, tannic acid, and bicarbonate. The sorption curves for Cu(II), Cd(II), and Zn(II) onto humic acid and MnO2 obeyed Langmuir adsorption isotherms whereas the sorption of the above ions onto bentonite followed a Freundlich isotherm. Chemical analysis of the total model using atomic absorption spectroscopy and differential pulse anodic stripping voltammetry indicated that copper distribution depends on the pH of the suspension: above pH 6.0, 50 % of the copper is sorbed onto the particulates whereas the copper in solution is in a complexed form; between pH 6 and 3.8 the soluble copper is distributed between organic complexes and "free" copper ion; between pH 4.2 to 2.5 copper is being des...
TL;DR: In this article, phase relationships in the copper/selenium system in the composition range 30-70 atomic % selenium have been studied at temperatures from 298 to 850 K and at pressures to 50 kbar.
Abstract: Phase relationships in the copper/selenium system in the composition range 30–70 atomic % selenium have been studied at temperatures from 298 to 850 K and at pressures to 50 kbar. A revised atmosph...
TL;DR: In this article, the infrared spectra of dimethyl carbonate in liquid and solid phases and the Raman spectrum of the liquid phase were reported and the evidence suggests that dimethyl carbomethane exists as an equilibria.
Abstract: The infrared spectra of dimethyl carbonate in the liquid and solid phases and the Raman spectrum of the liquid phase are reported. The evidence suggests that dimethyl carbonate exists as an equilib...
TL;DR: The densities and volumetric specific heats of binary mixtures of DMSO, ACT, and acetamide in water were measured at 25 °C with a flow densimeter and a flow micr... as mentioned in this paper.
Abstract: The densities and volumetric specific heats of binary mixtures of dimethylsulfoxide (DMSO), acetone (ACT), and acetamide (ACM) in water were measured at 25 °C with a flow densimeter and a flow micr...
TL;DR: In this article, photooxidation of 1,3-diphenylisobenzofuran (DPBF) in aromatic solvents at 30° gives a monomeric peroxide along with minor amounts of o-benzylphenyl benzoate, whereas in CCl4o-dibenzoylbenzene is t...
Abstract: Photooxidation of 1,3-diphenylisobenzofuran (DPBF) in aromatic solvents at 30° gives a monomeric peroxide along with minor amounts of o-benzylphenyl benzoate, whereas in CCl4o-dibenzoylbenzene is t...
TL;DR: The spirohydantoin (α-isomer) obtained from 4-tert-butylcyclohexanone by the Bucherer-Bergs reaction has been shown by as mentioned in this paper.
Abstract: The spirohydantoin (α-isomer) obtained from 4-tert-butylcyclohexanone by the Bucherer–Bergs reaction has been shown by n.m.r., u.v., and considerations of steric hindrance to have the tert-butyl gr...
TL;DR: In this paper, the structure of ferric phosphate at room temperature was refined on a Dauphine-twinned crystal using full-matrix least-squares methods.
Abstract: The structure of ferric phosphate at room temperature was refined on a Dauphine-twinned crystal using full-matrix least-squares methods. The final R value was 0.078 for 487 symmetry-independent ref...
TL;DR: In this paper, the tin compound appeared to be of the same type as the one in this paper, and was examined by X-ray powder diffractometry and by infrared, Raman, and Mossbauer 119Sn spectroscopy.
Abstract: Cubic M4+P2O7 pyrophosphates of Ti, Zr, Hf, Sn, and Pb have been examined by X-ray powder diffractometry and by infrared, Raman, and Mossbauer 119Sn spectroscopy. The tin compound appeared to be of...
TL;DR: In this article, the association of monovalent cations with polyethyleneglycol ethers has been investigated and the 1:1 association constants KA have been obtained in methyl alcohol at 25 °C.
Abstract: We report data concerning the association of monovalent cations with some polyethyleneglycol ethers that we have prepared.1:1 association constants KA have been obtained in methyl alcohol at 25 °C ...
TL;DR: A direct correlation exists between the extent of covalent cross-linking and (G + C) content of various DNA's of comparable ...
Abstract: Certain bisaziridinopyrrolidinoquinone analogs, which contain the structural moieties essential for physiological activity in the parent antitumor agent mitomycin C, have been synthesized. These compounds efficiently induce covalent cross-links in DNA as shown by the ethidium fluorescence assay which was confirmed by an independent S1-endonuclease assay. The interaction of clinically active and structurally related antitumor aziridinoquinones with DNA have been examined similarly. The aziridinoquinones cross-link DNA efficiently with a marked pH dependence. Parallel dependence is observed on pH and concentration of alkylating species in the concomitant alkylation which does not result in cross-linking as measured by the suppression of the before heat fluorescence. The latter phenomenon was shown by the application of radiolabelled polynucleates not to be accompanied by depurination. A direct correlation exists between the extent of covalent cross-linking and (G + C) content of various DNA's of comparable ...
TL;DR: For liquid solutions, the combinatorial entropy of mixing is commonly calculated using either (a) the ideal-solution model (suitable for mixtures of simple spherical molecules) or (b) the Flory lat...
Abstract: For liquid solutions, the combinatorial entropy of mixing is commonly calculated using either (a) the ideal-solution model (suitable for mixtures of simple spherical molecules) or (b) the Flory lat...
TL;DR: Signs of 2J 13C−1H coupling in 13C-enriched carbohydrates have been determined from proton spectra by the double irradiation technique as discussed by the authors, where both positive and negative 2J values are given and characterized in terms of the relative orientations of the coupled proton and of oxygen appended to the 13C nucleus; e.g., an oxygen anti to the proton appears to make a positive contribution to 2J and a gauche oxygen a negative one.
Abstract: Signs of two bond (2J) 13C–1H coupling in 13C–enriched carbohydrates have been determined from proton spectra by the double irradiation technique. Instances of both positive and negative 2J values are given and are characterized in terms of the relative orientations of the coupled proton and of oxygen appended to the 13C nucleus; e.g., an oxygen anti to the proton appears to make a positive contribution to 2J and a gauche oxygen a negative one. Theoretical calculations, using ethanol and 1,1-ethanediol as model compounds, are in accord with these experimental observations.
TL;DR: In this article, the complexes of 2-mercaptobenzothiazole with Cu(II), Ni, Co, Co and Ag(I) have been synthesized and their structures have been assigned on the basis of analytical properties.
Abstract: The complexes of 2-mercaptobenzothiazole with Cu(II), Ni(II), Co(II), Cd(II), Zn(II), Pb(II), Tl(I), and Ag(I) have been synthesized. Their structures have been assigned on the basis of analytical,...
TL;DR: In this paper, the effects of substitutions on 13C chemical shift of substitution at various positions in the thiochromanone skeleton have been examined, including methyl, phenyl, methoxyl, bromine, and carbomethoxyl.
Abstract: 13C Chemical shift data have been obtained for more than 50 thiochromanone and related sulfoxide and sulfone derivatives The assignments of the various resonances in the most important of these have been made using the limited data already available and also by comparison with certain model compounds, such as thioanisole, diphenyl sulfide, and the corresponding sulfoxides and sulfonesWithin each of these three series and in a fourth which comprises derivatives of thiochromone, including three α, β-unsaturated thiones, we have examined the effects on 13C chemical shift of substitution at various positions in the thiochromanone skeleton Among the substituents examined in this context are methyl, phenyl, methoxyl, bromine, and carbomethoxyl Attempts to compare the 13C chemical shifts for the thiochromanone series with those in a few oxygen containing analogs and in a small number of structurally similar analogs are also discussed
TL;DR: The molecular and crystal structure of cis-dichlorobis (dimethylsulfoxide) platinum(II), cis-[PtCl2(DMSO)2], has been studied by X-ray diffraction as mentioned in this paper.
Abstract: The molecular and crystal structure of cis-dichlorobis (dimethylsulfoxide) platinum(II), cis-[PtCl2(DMSO)2], has been studied by X-ray diffraction. The compound belongs to the mono-clinic P21/c spa...
TL;DR: In this paper, the synthesis and characterisation of several dibasic tridentate Schiff base ligands (H2SB) are described, and structural formulas for the isolated ligands are suggested on the basis of infrared, nucle...
Abstract: The synthesis and characterisation of several dibasic tridentate Schiff base ligands (H2SB) are described. Structural formulas for the isolated ligands are suggested on the basis of infrared, nucle...