摘要:

The constitution of calycanine, a dehydrogenation product of the alkaloid calycanthine, is discussed. Calycanine dipicrate has been prepared, and, on the basis of its analysis and the infrared spectrum of calycanine, a quinolinoquinoline structure has been put forward for calycanine. The synthesis of quinolino-(2:3:3′:2′)-quinoline is described.

ISSN:0008-4042    

DOI:10.1139/v58-214

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

A method has been developed whereby current yields of as high as 70% of anodically discharged hydrogen can be maintained during continuous electrolysis of lithium hydride at or just below its melting point. Efforts to utilize this process for the separation of hydrogen and deuterium were unsuccessful.

ISSN:0008-4042    

DOI:10.1139/v58-215

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

Co-ordination complexes of titanium tetrachloride with formamide and N,N-dimethyl formamide have been prepared. All the complexes found are explained through a co-ordination number of 6 for titanium (IV).The infrared spectra of these compounds were measured; a negative shift observed for the carbonyl frequency and a positive shift observed for what is thought to be the C—N frequency are explained by a co-ordination through the oxygen of these molecules. Structural formulas are proposed for the compounds obtained.

ISSN:0008-4042    

DOI:10.1139/v58-216

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

The wood of white elm (Ulmusamericana) has been found to contain less xylan than most other hardwoods. Partial hydrolysis of the hemicellulose component yielded an aldotriouronic acid, a glucuronosyl xylose, 2-O-(4-O-methyl-α-D-glucopyranosyluronic acid)-D-xylopyranose, 4-O-methyl-D-glucuronic acid, and galacturonic acid.Hydrolysis of the fully methylated polysaccharide gave a mixture of 2-O- and 3-O-methyl-D-xylose, 2,3-di-O-methyl-D-xylose, 2,3,4-tri-O-methyl-D-xylose, and 2-O-(2,3,4-tri-O-methyl-α-D-glucopyranosyluronic acid)-3-O-methyl-D-xylopyranose in a molar ratio of 6:124:1:14. The number-average degree of polymerization of the methylated hemicellulose was 133 and that of the native polymer 185. On the basis of this and other evidence it is suggested that the xylan is linear and contains 185 1,4-linked β-D-xylopyranose residues, every seventh of which carries a single terminal side chain of 4-O-methyl-D-glucuronic acid attached by an α-glycosidic bond through C2of the xylose. The number of acid groups is larger than in other hardwood hemicelluloses so far studied.

ISSN:0008-4042    

DOI:10.1139/v58-217

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

The systems: nicotine–water and nicotine – methylethyl ketone were investigated by thermal analysis but the eutectic points were not obtained due to the extreme viscosity and consequent supercooling of solutions of high nicotine content.The densities, viscosities, and refractive indices were determined for the nicotine – methylethyl ketone – water system at 25.0 °C.The mutual solubilities of nicotine, methylethyl ketone, and water were determined over the entire temperature range. A ternary critical point was found at 67.3 °C, the critical composition being 27 weight per cent nicotine; 14 weight per cent methylethyl ketone.The methylethyl ketone – water and nicotine–water solubility curves were redetermined. The existing data for the former system were confirmed but the data for the classical system nicotine–water were found to be seriously in error at the higher critical solution temperature. Thus the lower critical solution temperature was found to be 61.5 °C, in good agreement with previous figures, but the upper critical solution temperature lies at 233.0 °C, some twenty degrees higher than had been obtained by previous workers; the corresponding critical compositions are 36% and 40% nicotine respectively.

ISSN:0008-4042    

DOI:10.1139/v58-218

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

Investigations leading to a method for the analysis of mixtures of the oxides UO3, U3O8, and UO2are described.Uranic oxide is extracted with hot ammonium citrate solution, uranic and uranous-uranic oxides are determined together by solution in phosphoric acid followed by titration of U(VI) with titanous sulphate, and uranous oxide found by difference.

ISSN:0008-4042    

DOI:10.1139/v58-219

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

The rate constants and activation energies for the reactions of C3F7radicals with methane and ethane have been measured by photolyzing mixtures of C3F7COC3F7and hydrocarbon with 3130 Å light. Photolysis of mixtures of the ketone, methane, and deuterium has been used to check previous measurements on the reaction of C3F7and deuterium.

ISSN:0008-4042    

DOI:10.1139/v58-220

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

Unsymmetrically substituted dicoumarol derivatives have been synthesized by taking advantage of the fact that 4-hydroxycoumarins will undergo the Mannich reaction at C3and also take part in Michael-type addition reactions. In the presence of methyl iodide, 4-hydroxy-3-N-piperidinomethylcoumarin and 4-hydroxycoumarin gave dicoumarol. By using monosubstituted 4-hydroxycoumarins a variety of unsymmetrically substituted dicoumarols have been prepared in good yield. The infrared spectra of some of the intermediates and products are reported and discussed.

ISSN:0008-4042    

DOI:10.1139/v58-221

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

In the reciprocal salt pair Li2, K2, Cl2, SO4, and water, at 25 °C there are large areas in which potassium sulphate and potassium lithium sulphate (KLiSO4) are separately in equilibrium with solution. Two incongruent invariant points exist. At one of these the composition of the solution is 0.917 mole fraction chloride, 0.437 mole fraction lithium, and 19.4 moles of water per total mole of salt, the equilibrium solid phases being potassium chloride, potassium sulphate, and the double salt. At the second, the composition of the solution is 0.967 mole fraction chloride, 0.870 mole fraction lithium, and 13.8 moles of water per mole of salt, the solid phases being potassium chloride, double salt, and lithium sulphate monohydrate. One congruent invariant point exists, at which the composition of the solution is 1.00 mole fraction chloride, 0.960 mole fraction lithium, and 9.6 moles of water per mole of salt, the solid phases being lithium sulphate monohydrate, lithium chloride monohydrate, and potassium chloride.In the reciprocal salt pair Li2, Na2, Cl2, SO4, and water, at 25 °C there is an incongruent invariant point at which the composition of the solution is 0.873 mole fraction chloride, 0.668 mole fraction lithium, and 15.1 moles water per total mole of salt, the solid phases being sodium chloride, solid solution of sodium and lithium sulphates, and lithium sulphate monohydrate. A congruent invariant point exists, at which the composition of the solution is practically entirely lithium chloride, the solid phases present being lithium chloride monohydrate, lithium sulphate monohydrate, and sodium chloride.

ISSN:0008-4042    

DOI:10.1139/v58-222

出版商:NRC Research Press    

年代:1958

数据来源: NRC

摘要:

The kinetic behavior of a γ-ray spur produced in water, having H and OH radicals distributed spatially in the manner suggested by Samuel and Magee, has been studied using an electronic computer. The variation in yield of the molecular products H2, H2O2, and H2O with rate constants, diffusion constants, and spur size has been obtained. The model gives agreement with experiment choosing spurs with a small "radius" of the order of 10 Å. On simple assumptions, however, the model predicts no difference in the molecular yields between heavy and light water and no isotopic separation in the formation of molecular hydrogen from isotopically enriched light water. Various special assumptions needed to give agreement with experiment for these isotope effects are discussed. The observed isotopic separation in the formation of molecular hydrogen is attributed to the preferential dissociation of an H atom from an excited HDO molecule. It is found that the yield of molecular hydrogen is less sensitive to the presence of scavengers than the yield of hydrogen peroxide.

ISSN:0008-4042    

DOI:10.1139/v58-223

出版商:NRC Research Press    

年代:1958

数据来源: NRC