摘要:

In continuation of the work reported in Part I, several more bipyridyl analogues have been prepared and the absorption spectra of the cuprous and ferrous complexes determined. The results follow the pattern of the previous series of compounds.

ISSN:0008-4042    

DOI:10.1139/v54-084

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Sodium formate-C14and C14-methyl-D- andL-methionine were each fed to sprouting barley under identical conditions and radioactive alkaloids were isolated from the leaves and roots. Degradation of these alkaloids showed that theD- andL-methionines were an equally efficient source of.the methyl groups of N-methyltyramine and hordenine, the root alkaloids; butD-methionine was a less efficient source thanL-methionine of the methyl groups of gramine, from the leaves. The formate was a source of the methyl groups of all the alkaloids, however, less efficient than the methionines, and a very poor source for the methyl groups of gramine. The significance of these results is discussed.

ISSN:0008-4042    

DOI:10.1139/v54-085

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The reaction H + CH4 = CH3 + H2has been studied in the temperature range 99° to 163 °C. The rate constant is given by the expressionk = 1.7 × 10−14exp (−4500/RT). The data are in agreement with the results, but not the interpretations, of previous work. The entropy of the methyl radical has been calculated for several temperatures.

ISSN:0008-4042    

DOI:10.1139/v54-086

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

From thermodynamic considerations a simple equation is derived which correlates length changes of a porous rigid adsorbent with its elastic and adsorptive properties. The equation contains a structure factor which is a constant characteristic of the adsorbent. Calculated and observed results agree reasonably well and suggest that, in the cases concerned, the assumptions underlying the derivation of the equation are valid. The underlying assumptions are: (a) both adsorbate and adsorbent can each exist separately in equilibrium with externally applied forces in states that are thermodynamically identical with their states in the adsorbate–adsorbent system, (b) adsorption isotherms represent paths of thermodynamic reversibility.

ISSN:0008-4042    

DOI:10.1139/v54-087

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The ultraviolet and infrared spectra of some saturated and unsaturated six membered lactams are described, and the unusual features in the 3 μ and 6 μ regions discussed. A comparison is made of these spectra with those previously ascribed to α–β unsaturated lactams.

ISSN:0008-4042    

DOI:10.1139/v54-088

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

It has been found that exchange between persulphate and sulphate, in both concentrated acetic acid as solvent and in aqueous solution, is not more than one half of one per cent complete in 12 hr. at 34.2 °C. This indicates that the equilibrium proposed by Levitt,probably plays no part in persulphate oxidations.

ISSN:0008-4042    

DOI:10.1139/v54-089

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The binary eutectics Li2SO4•H2O–ice and (NH4)2SO4–ice as well as the ternary eutectics Li2SO4•H2O–Li2SO4•(NH4)2SO4–ice and (NH4)2SO4–Li2SO4•(NH4)2SO4–ice have been determined as to temperature and composition. The complete solubility isotherms at 0.1°, 71.8°, and 95.2 °C. have been investigated. The enthalpies of solution of lithium sulphate monohydrate, of ammonium sulphate, and of double salt have been determined (in water at room temperature), and from these data, as well as from the solubility isotherms, it has been shown that the temperature of the transition of the double salt, Li2SO4•(NH4)2SO4, to its component single salts (in the presence of water) is approached by lowering the temperature, but this transition temperature is still far from reached when the system freezes completely.

ISSN:0008-4042    

DOI:10.1139/v54-090

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The lactam derived from the alkaloid lycoctonine has been shown to undergo rearrangement when heated with mineral acids. A ketone, anhydrolycoctonam, is formed first by pinacolic dehydration. This ketone then undergoes elimination of the elements of methyl alcohol, and hydrolysis of a methoxyl to give lycoctamone, an α–β unsaturated ketone containing a new tertiary hydroxyl. Reactions of lycoctamone and its reduction products are described and discussed.

ISSN:0008-4042    

DOI:10.1139/v54-091

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The main product of the reactions of active nitrogen withn- and iso-butanes at 75 °C. and 250 °C. was hydrogen cyanide. Small amounts of C2hydrocarbons, mainly ethylene and acetylene, were produced in both reactions. Second order rate constants were calculated on the assumption that the reactive species in active nitrogen is atomic nitrogen, and that the initial attack of a nitrogen atom is the rate-controlling step. The activation energies were then estimated to be 3.6 kcal. and 3.1 kcal. and the probability factors 4.5 × 10−4and 4.4 × 10−4, for then-butane and isobutane reactions respectively.

ISSN:0008-4042    

DOI:10.1139/v54-092

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v54-093

出版商:NRC Research Press    

年代:1954

数据来源: NRC