摘要:

X-Ray powder diffraction patterns have been recorded for the alkali dithionates and for barium and ammonium dithionate. The patterns have been indexed and unit cell dimensions determined for lithium dithionate dihydrate, sodium dithionate (anhydrous), and rubidium dithionate. Previously determined cell dimensions have been confirmed in other cases.

ISSN:0008-4042    

DOI:10.1139/v63-035

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The pyrolysis of HgMe2has been investigated in a benzene carrier system using temperatures from 693 °K to 800 °K and pressures from 0.36 cm to 26.0 cm. High-pressure limiting rate constants were obtained above approximately 10 cm pressure. The high-pressure activation energy,E0, of 53.7 ± 0.5 kcal/mole is identified withD(MeHg—Me) within the limitsD < E0 < D + RT.

ISSN:0008-4042    

DOI:10.1139/v63-036

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Nitration of 2-amino-, 2-N-methylamino-, and 1-amino-phenazine resulted in the formation of 2-amino-1-nitro-, 2-N-methylamino-1-nitro-, and 1-amino-4-nitro-phenazine, respectively. Nitration of 2-aminophenazine was shown to proceed via the intermediate nitramine, which was isolated and identified. 2-Hydroxy-1-nitrophenazine was found to exist in the solid state exclusively in the hydroxy form, and 4-nitro-1(5H)-phenazinone was the only solid obtained on acidification of a 1-hydroxy-4-nitrophenazine salt solution.

ISSN:0008-4042    

DOI:10.1139/v63-037

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The ion–molecule reactions occurring in ethylene and in propylene at high pressures in the mass spectrometer ion source have been studied. It has been shown that two of the six secondary ions in ethylene and four of the nine secondary ions studied in propylene are products of more than one ion–molecule reaction. The cross sections for the separate reactions at 10 v/cm field strength are reported.

ISSN:0008-4042    

DOI:10.1139/v63-038

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The DTG curves for the dehydration of a number of preparations of Mg(OH)2were determined. Equations necessary to calculate energies of activation and rate constants from these curves were derived on the basis of a two-thirds-order process for dehydration. It was found that the energy of activation was about 5 kcal greater for naturally occurring than for precipitated Mg(OH)2. This was interpreted to mean that there was a difference in the energy levels of the two preparations, and therefore a difference in their apparent solubility products. Differences obtained in the DTG curves for four different preparations of Mg(OH)2indicated the probability of a series of energy levels for Mg(OH)2.

ISSN:0008-4042    

DOI:10.1139/v63-039

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Sixteen steps from vanillin led to syntheses of (a) dimethyl 3-(4′-carbomethoxyphenoxy)-4,5-dimethoxyphthalate (Ic), a known degradation product of isochondrodendrine, and (b) the more hindered dimethyl 3-(4′-carbomethoxy-2′-methoxyphenoxy)-4,5-dimethoxyphthalate (Ia), which has not been derived from any alkaloid, though the usual concepts of biosynthesis do not rule out the occurrence of alkaloids which could lead to it. Diphenyl ethers related to Iawould be expected to show the effects of steric hindrance, but even with the most hindered member of the group, 7-(4′-carboxy-2′-iodophenoxy)metameconine (VAe), no evidence for an appreciable half-life of rotational isomers could be obtained. Attempts to make diphenyl ethers through the condensation of phenols with dicyclohexylcarbodiimide led to other products.

ISSN:0008-4042    

DOI:10.1139/v63-040

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The phase diagram of the acetone–water system shows that acetone hydrate decomposes at an incongruent melting point. The existence of acetone hydrate is confirmed by a study of the low-frequency dielectric properties of this system. A dispersion region, related to the relaxation of water molecules in the clathrate structure, is characterized by a "static" dielectric constant and an activation energy about half as large as the corresponding values for ice, and by a limiting high-frequency dielectric constant of about 7 at 200° K. The magnitude of the latter is attributed to orientation of acetone molecules within the larger cavities of the hydrate structure.

ISSN:0008-4042    

DOI:10.1139/v63-041

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Structures have been assigned to the mono-, di-, and tri-nitration products of 2-phenyl-1,2,3,2H-triazole, on the basis, partly, of ultraviolet absorption spectra. The pattern of nitration closely resembles that of 1-phenylpyrazole. A compound previously described as 2-(o-nitrophenyl)-1,2,3,2H-triazole is actually 4-nitro-2-p-nitrophenyl-1,2,3,2H-triazole.

ISSN:0008-4042    

DOI:10.1139/v63-042

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Values of heats of mixing are reported for methanol,n-butanol, andn-octanol with carbon tetrachloride at 25 °C. The experimental results are combined with data from other sources and an analysis of the excess thermodynamic functions for carbon tetrachloride solutions of methanol, ethanol,n-propanol,n-butanol, andn-octanol in terms of Barker's theory of solutions is described. The behavior of these systems can be reproduced fairly well by the Barker model.

ISSN:0008-4042    

DOI:10.1139/v63-043

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Cyclopentanone vapor, when excited by light of wavelength 3130 Å, gives rise to four different photoproducts and fluorescence. The photochemistry of the molecule has been investigated by Srinivasan (J. Am. Chem. Soc.81, 1546 (1959); 83, 4344, 4348 (1961)). In the present work the fluorescence spectrum and fluorescence efficiency of cyclopentanone vapor are reported for the first time. The fluorescence spectrum is identical with that obtained from liquid solutions of cyclopentanone, with a maximum at 4100 Å. Time, temperature, oxygen, and inert gases do not affect the spectrum, which contains no component ascribable to phosphorescence, maximum 4450 Å. Beer's law is obeyed.The fluorescence efficiency is also found to be independent of the variables temperature and pressure of inert gas, cyclopentanone, and oxygen. This is in marked contrast with the behavior of the photochemical yields (see work by Srinivasan). The yields of cyclobutane and ethylene tend to increase at high vibrational energy content of the excited molecule (low pressure, high temperature, short exciting wavelengths), while the yield of pentenal increases under conditions of decreasing vibrational energy content (high pressures, etc.). The fact that fluorescence stabilization does not occur in cyclopentanone can be related to the results of photolysis.

ISSN:0008-4042    

DOI:10.1139/v63-044

出版商:NRC Research Press    

年代:1963

数据来源: NRC