摘要:

When cellulose acetate sulphate is dissolved in acetone the hydrolysis of the sulphate ester is rapid compared with that of the acetate ester. In 70% acetone the relative rates are reversed. Hydrolysis of the sulphate ester in acetone is greatly affected by the temperature. At 25 °C. or greater the hydrolysis is complete after 24 hr. A potentiometric titration method has been developed for the estimation of sulphuric acid in the presence of smaller amounts of acetic acid.

ISSN:0008-4042    

DOI:10.1139/v54-104

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

2-Monosubstituted-3-hydroxy-5-pyrazolones were prepared from diethyl malonate itself and diethyl malonates monosubstituted with methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, and benzyl groups by condensation of the esters witho-,m-, andp-chlorophenylhydrazines, andn-hexylhydrazine. By using diethyln-hexyl malonate-2-C14ando-,m-, andp-chlorophenylhydrazines, andn-hexylhydrazine as starting materials the corresponding pyrazolones labelled with C14were obtained. Their specific activities were 7.0, 8.8, 9.0, and 8.8 µc./gm. respectively. Ultraviolet absorption spectra were determined in neutral and alkaline solution and the infrared spectra were also obtained. From the data it was possible to ascribe the tautomeric structures best suited for the compounds.

ISSN:0008-4042    

DOI:10.1139/v54-105

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Precise values for the viscosity of silver nitrate show that Frenkel's relation for comparison of the temperature dependence of viscosity and conductivity is valid for this system and that the energy of activation for viscous flow is proportional to that for electrical transport over a range of temperature.

ISSN:0008-4042    

DOI:10.1139/v54-106

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Differential thermodynamic properties of methane, ethane, propane, andn-butane adsorbed on rutile have been determined from isotherms over appreciable temperature ranges. Ordinary experimental techniques failed to yield reliable data in low temperature and surface coverage regions, but essentially simple modifications of these resulted in accurate thermodynamic values. For methane, the results compared well with similar ones computed by Pace, Heric, and Dennis from data obtained by means of calorimetry. Maximum error in isosteric heats of adsorption was 60 cal. mole−1; in differential molar entropies 0.8 cal. mole−1degree−1. The thermodynamic properties of methane and ethane are similar but there is a departure in the set pattern for propane. A large change was observed in the heat of adsorption of propane, near 185° K. and surface coverages lower than 0.6 of the monolayer. A phase transition is suggested to account for this occurrence.

ISSN:0008-4042    

DOI:10.1139/v54-107

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The O—H bending and N—O stretching vibrations were studied in four pairs of isomeric oximes. A band at 1265 cm.−1, characteristic of the solution spectra of the α oximes, is identified with the O—H bending mode. Tentative assignments for the N—O stretching vibration both in solid and solution spectra are advanced. The β isomers show a distinct shift of the band associated with the N—O mode from about 950 cm.−1in the solid to about 930 cm.−1in solution.

ISSN:0008-4042    

DOI:10.1139/v54-108

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Conductivity data have been combined with transport fractions to show that silver chloride in dilute solutions in silver nitrate can be regarded as being almost completely in the form of complex cation. The mobility of the complex ion is shown to be about one-half that of silver ion.

ISSN:0008-4042    

DOI:10.1139/v54-109

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The compounds identified by previous investigators as thiocarbamyl oxides (commonly known as "thiuram oxides") are shown to be, instead, the isomeric thiocarbamyl carbamyl sulphides.

ISSN:0008-4042    

DOI:10.1139/v54-110

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The aeration of dilute solutions of disodium ethylenebisdithiocarbamate yields hexahydro-1,3,6-thiadiazepine-2,7-dithione (I), polymeric I, 2-imidazolidinethione, and elemental sulphur. I with ammonia gives mainly hexahydro-1,3,5-triazepine-2,4-dithione. I and polymeric I have high antifungal activity.

ISSN:0008-4042    

DOI:10.1139/v54-111

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Data are presented on the product yields and the general course of the partial oxidation ofn-butane at an ambient temperature of 725 °F., at pressures ranging from 50 to 175 p.s.i.a., reaction times of 1.0 to 4.5 sec., and inlet reactant compositions of 1.5 to 6.0 mole %n-butane and 1.5 to 6.0 mole % oxygen (the remainder being diluent nitrogen). Conditions were neither isothermal nor adiabatic and peak temperatures as much as 70 Fahrenheit degrees higher than the inlet temperatures were encountered. The reactor consisted of a 24-ft. length of 1/4-in. stainless steel pipe, immersed in a bath of boiling Aroclor 1254. Under optimum conditions, a 20% conversion of the butane to methanol, ethanol, acetaldehyde, acetone, and formaldehyde was obtained. In all the tests, an induction period of approximately 0.75 sec. was observed.

ISSN:0008-4042    

DOI:10.1139/v54-112

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The analytical proof of H. Fischer's structure for uroporphyrin I has been completed, and the structure confirmed by synthesis.

ISSN:0008-4042    

DOI:10.1139/v54-113

出版商:NRC Research Press    

年代:1954

数据来源: NRC