摘要:

The rates of reaction of halide ions with ethylene oxide in neutral aqueous solution and the rate of hydrolysis of ethylene oxide in acid solution have been measured and the activation energies determined. From these data and from the ratio of glycol to chlorohydrin formed when ethylene oxide reacts with excess aqueous hydrogen halide, the rates of the acid-catalyzed addition of halide ions to ethylene oxide at 25 °C. have been estimated.

ISSN:0008-4042    

DOI:10.1139/v52-025

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The pore distributions of three activated charcoals have been calculated from the low temperature nitrogen and water isotherms. The method of Barrett, Joyner, and Halenda has been used with the nitrogen data, while the Kelvin equation has been applied to the water isotherm. The two curves coincide if cos θ = 0.65 is used in the Kelvin equation, where θ is the wetting angle. This figure is in general agreement with a published figure obtained by an independent method.

ISSN:0008-4042    

DOI:10.1139/v52-026

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Carrier-precipitation and serial molybdate precipitation procedures for the identification and estimation of chemical forms of phosphorus are presented in some detail. Application of these methods to the investigation of the forms of phosphorus-32 in superphosphate and calcium sulphate after neutron bombardment is described. The results obtained indicated that about 40% of the phosphorus-32 in the superphosphate was in the orthophosphate form and that the greater part of the remainder was present as metaphosphate and phosphite. Approximately 90% of the radioactive phosphorus present in the calcium sulphate was estimated to be in the orthophosphate form. The amount of phosphorus-32 in the superphosphate originating from the calcium sulphate component was estimated to be less than 0.2%.

ISSN:0008-4042    

DOI:10.1139/v52-027

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The photochemical decomposition of nitric oxide has been studied over a pressure range 60 to 500 mm., using a low pressure mercury arc source and a circulating system. Stoichiometrically, the reaction was found to be represented by 6NO → N2 + 2N2O3. Addition of nitrogen decreased the rate, as did also a decrease in the mercury vapor pressure. Using appropriate light filters at 1.7 × 10−3 mm. mercury pressure the decomposition was shown to be photosensitized by Hg (61P1) atoms. The primary process is probably dissociation of nitric oxide into nitrogen and oxygen atoms.

ISSN:0008-4042    

DOI:10.1139/v52-028

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The synthesis of 1,1,1-trichloro-2,2-bis-(p-cyanophenyl)-ethane was carried out with the condensation product of chloral and toluene as starting material. This product was converted, through the corresponding tetraacetate, to 1,1,1-trichloro-2,2-bis-(p-aldehydophenyl)-ethane which in turn reacted with hydroxylamine to give the dioxime. The subsequent dehydration of the latter gave rise to the desired dinitrile. The corresponding dichloro derivatives of the oxime and nitrile were also prepared.

ISSN:0008-4042    

DOI:10.1139/v52-029

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

The synthesis of dibenz[a,c][1,3]cycloheptadiene-5,7-dione (I), a new member of the dibenz[a,c][1,3]cycloheptadiene (II) series, has been accomplished by (1) the condensation of diethyl diphenate and ethyl acetate with alkaline catalysts, (2) the reaction of diphenoyl chloride and sodiomalonic ester, and (3) the condensation of diphenic anhydride and malonic ester with zinc chloride. In addition to the (I), these reactions afford comparable amounts of 2,21-diacetyl biphenyl (XIII). It has been possible to establish the identity of (I) from the carbonyl and enolic derivatives and products obtained in reactions of hydrolysis, oxidation, and reduction.

ISSN:0008-4042    

DOI:10.1139/v52-030

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v52-031

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v52-032

出版商:NRC Research Press    

年代:1952

数据来源: NRC