摘要:

The mercury photosensitized reactions of neopentane have been investigated at pressures between 50 and 400 mm. of mercury and between 25° and 200 °C., in the presence and absence of hydrogen. The products are largely hydrogen and dineopentyl. The quantum yield of hydrogen production is 0.004 at room temperature and has a positive temperature coefficient corresponding toE = 4.3 kcal.mole−1. The facts are consistent with the reactions:—as the initial step. The majority of the reaction goes by (b), and the active molecules produced, C5H12*, are nearly all deactivated.

ISSN:1923-4287    

DOI:10.1139/cjr49b-022

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Fourteen pyrazolones were synthesized from the corresponding mono or disubstituted cyanoacethydrazides or cyanoacetphenylhydrazides and evidence concerning their constitution was obtained from chemical reactions and ultraviolet absorption spectra determinations. A mixture of two tautomeric forms was obtained when 4-benzyl-3-amino-5-pyrazolone was prepared; it was converted to a single form by treatment with hydrochloric acid. The following compounds, as far as the authors are aware, have been prepared for the first time: 4-methyl-3-amino-5-pyrazolone, 4-methyl-2-phenyl-3-amino-5-pyrazolone, 4-ethyl-3-amino-5-pyrazolone, 4-ethyl-2-phenyl-3-amino-5-pyrazolone, 4-(2-phenoxyethyl)-3-amino-5-pyrazolone, 4-(2-phenoxyethyl)-2-phenyl-3-amino-5-pyrazolone, 4-(3-phenoxypropyl)-3-amino-5-pyrazolone, 4-(3-phenoxypropyl)-2-phenyl-3-amino-5-pyrazolone, 4-phenyl-3-amino-5-pyrazolone, 4-benzyl-3-amino-5-pyrazolone, 4-benzyl-2-phenyl-3-amino-5-pyrazolone, 4,4-dibenzyl-3-amino-5-pyrazolone, 4, 4-dibenzyl-2-phenyl-3-imino-5-pyrazolone, 4,4-(2,2-spiro-indanyl)-3-amino-5-pyrazolone.

ISSN:1923-4287    

DOI:10.1139/cjr49b-023

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The low temperature adsorptions of methane, ethane, propane, normal butane, isobutane, acetylene, ethylene, and nitrogen on a series of coconut charcoals of different degrees of activation were determined. Langmuir isotherms were obtained in every case. The measurements indicate horizontal orientation of the hydrocarbon molecules on the charcoal surface. By comparing the maximum number of millimoles adsorbed for each gas on each charcoal with the respective maximum number of millimoles of nitrogen adsorbed, and by assuming a molecular adsorption area of 16.2 Å2for nitrogen, the following average molecular adsorption areas were obtained: methane—19.4, ethane—25.9, propane—36.0, normal butane—42.1, isobutane—47.4, acetylene—19.8, and ethylene—23.1 Å2.

ISSN:1923-4287    

DOI:10.1139/cjr49b-024

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

An investigation ofSedum sarmentosumBunge has shown that this plant contains two liquid alkaloids which give rise to crystalline picrates. One of these bases proved to bedl-methylisopelletierine, identical with a synthetic specimen.

ISSN:1923-4287    

DOI:10.1139/cjr49b-025

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The nitrolysis of hexamethylenetetramine by the method of Hale yields, in addition to Cyclonite, an aqueous diluate which contains either dimethylolnitramide, its dinitrate ester, or both. The presence of dimethylolnitramide can be demonstrated by its condensation with methylenediamine to give 1,5-dinitro-3,7-endomethy¡ene-1,3,5,7-tetrazacycloöctane (DPT). The latter compound was identified by nitrolysis to 1,3,5,7-tetranitro-1,3,5,7-tetrazacycloöctane. The validity of the Mannich-type condensation of dimethylolnitramide from the Hale diluate (or from formaldehyde and nitramide) to form DPT has been attested by similar condensations with methylamine, ethylenediamine, cyclohexylamine, and benzylamine. In one of these condensations acetaldehyde has replaced part of the formaldehyde. Dimethylolnitramide has further been characterized by its conversion to 3,7-dinitro-3,7-diaza-1,5-dioxacycloöctane. Nitrolysis of the latter formssym. dinitroxydimethylnitramide, which can be acetolyzed tosym. diacetoxydimethylnitramide.

ISSN:1923-4287    

DOI:10.1139/cjr49b-026

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The specific surface of a strontium sulphate precipitate, as determined by the direct radioactive method using Sr90, was found to be 12,800 sq. cm. per gm. The specific surface of the same strontium sulphate precipitate was also determined by the indirect method using ThB. Specific surfaces of 30,800 and 21,300 sq.cm. per gm. were obtained using ThB separated, from thorium nitrate, by the chemical separation and emanation methods, respectively. The factor of approximately 2 between the direct and indirect methods indicates that Paneth's theories, while probably correct in the main, may require some modification.

ISSN:1923-4287    

DOI:10.1139/cjr49b-027

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

In a study of the exchange of radioactive cobalt between Co++and Co(NH3)6+++it was found that no exchange within experimental error occurred within seven days at 25 °C., or two days at 50 °C. The various steps involved in a conceivable mechanism by which exchange might have been expected to occur were then investigated separately. From the results obtained it appears that dissociation of the complex is one limiting factor. The exchange between the two hexammino complexes of divalent and trivalent cobalt was found to be very slow at 25 °C.

ISSN:1923-4287    

DOI:10.1139/cjr49b-028

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The kinetics of the reaction between cyanogen chloride and water and between cyanogen bromide and water, catalyzed by hydrogen chloride or hydrogen bromide in dioxane solution, has been investigated. With stoichiometric proportions of cyanogen chloride and water, the reaction catalyzed by hydrogen chloride is of the second order, and the specific reaction rate is directly proportional to the square of the concentration of hydrogen chloride. This reaction was found to have zero temperature coefficient between 20° and 40 °C. The reaction between cyanogen bromide and water, catalyzed by hydrogen bromide, has been shown to proceed through the formation of an unstable intermediate compound, which probably results from a primary reaction between cyanogen bromide and hydrogen bromide. The intermediate product was isolated but was so unstable that its identity was not satisfactorily established. The over-all hydrolysis reaction of cyanogen bromide has a positive temperature coefficient between 20° and 40 °C. The catalyst in the hydrolysis of both cyanogen chloride and cyanogen bromide in dioxane solution appears to be molecular hydrogen chloride or hydrogen bromide rather than hydronium ions.

ISSN:1923-4287    

DOI:10.1139/cjr49b-029

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr49b-030

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Three new pyridocarbazoles, namely, 11-pyrido(4,3-a)-, 11-pyrido(3.4-a)-, and 10-pyrido(3,4-b)- or 9-Pyrido(4,3-c)-carbazole have been synthesized from the hydrazones of cyclohexanone and 5-, 8-, and 7-hydrazinoisoquinoline respectively by ring closure and dehydrogenation of the resulting tetrahydropyridocarbazoles. In unsuccessful attempts to determine which of the two possible pyridocarbazoles is formed from the hydrazone of cyclohexanone and 7-hydrazinoisoquinoline, 11-metftyl-10-pyrido(3,4-b)carbazole was also synthesized. The hydrazone of cyclohexanone and 7-amino-8-chloroisoquinoline failed to undergo ring closure.

ISSN:1923-4287    

DOI:10.1139/cjr49b-031

出版商:NRC Research Press    

年代:1949

数据来源: NRC