摘要:

Electrostatic agglomeration can be induced in suspensions of glass beads in organic liquid media. The stability of the agglomerates is markedly dependent on temperature. The influence of surface roughness and the presence of small quantities of water on the interparticle interaction is discussed. Assuming a simple model the observed relationship between yield value and particle size for systems containing the same concentration of solid phase is derived.

ISSN:0008-4042    

DOI:10.1139/v55-141

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

A facile process for the conversion of N-(β-nitraminoethyl)-N′-substituted-N″-nitroguanidines into the reactive N-(β-chloroethyl)-N′-substituted-N″-nitroguanidines has been developed. N-(β-Nitraminoethyl)-N′-phenyl-N″-nitroguanidine on standing in concentrated hydrochloric acid solution gives a mixture of N-(β-chloroethyl)-N′-phenyl-N″-nitroguanidine and 1-nitro-2-phenylamino-2-imidazoline. N-(β-Chloroethyl)-N′-diethyl-N″-nitroguanidine, which is prepared in a similar manner, is unstable at room temperature and it slowly cyclizes to give 1-nitro-2-diethylamino-2-imidazoline. Some new nitroguanidine derivatives formed from the reaction of amines with methylnitrosonitroguanidine also are described.

ISSN:0008-4042    

DOI:10.1139/v55-142

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

The structure of 1,2-O-methylene-α-D-glucofuranose has been proved by preparing the 3,5,6-trimethanesulphonate and the 3,5,6-tri-p-toluenesulphonate derivatives of this compound from the corresponding derivatives of 1,2-O-iso-propylidene-α-D-glucofuranose. The results also constitute an additional proof for the recently established structure of the 1,2;3,5-di-O-methylene-α-D-gluco-furanose.

ISSN:0008-4042    

DOI:10.1139/v55-143

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

As part of the project outlined in Paper I of this series, we report kinetic data, including Arrhenius parameters, for the solvolysis of a number of alkyl benzene- and toluene-sulphonates in ethanol and in water. The alkyl groups include the α- and β-methylation series: methyl, ethyl, isopropyl,n-propyl, isobutyl, and neopentyl; the straight chain seriesn-butyl andn-amyl; and a small group of oxygen-containing chains. The observed rates for the α-methylation series parallel those for the bromides and nitrates, and for the β-methylation, those for the bromides. However, it is evident that current interpretations of rate differences observed in the straight chain and oxygenated series cannot be applied with confidence to the benzenesulphonates since the changes in the Arrhenius parameters are larger than the observed differences in the rate.

ISSN:0008-4042    

DOI:10.1139/v55-144

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

D-Glucose is degraded selectively to di-O-formyl-D-erythrose by oxidation with two moles of lead tetraacetate. The ester groups are easily hydrolyzed, givingD-erythrose in an over-all yield of at least 80% of theory. In like manner oxidation ofL-arabinose, followed by hydrolysis, affordsL-glyceraldehyde. It is suggested thatD-erythrose can readily associate intermolecularly, a property previously ascribed among sugars only to the trioses.

ISSN:0008-4042    

DOI:10.1139/v55-145

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

The over-all mechanism of the formation of guanidine from urea and ammonium sulphamate is briefly discussed. Experimental results are presented, indicating that primary formation of the ammonium salt of ureasulphonic acid and subsequent dissociation into cyanamide and ammonium sulphate, which further react to form guanidine in the known manner, constitute the main steps in the process.

ISSN:0008-4042    

DOI:10.1139/v55-146

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

The infrared spectra of 1-chloropropyne and 1-chloropropyne-d3have been investigated in the vapor state, in solution, and, in part, in the liquid over the spectral region 3 to 35 μ. Intensities of the infrared bands have been measured from the spectra of the solutions. The Raman spectra of the compounds in the liquid state, together with standard intensities and depolarization ratios of the Raman bands, were obtained. A complete assignment, based on a normal-coordinate calculation of the fundamentals, has been made. Coriolis coupling coefficients of three of the perpendicular-type fundamentals of CH3≡CCl were determined and those of the other two shown to be near unity. Two coupling coefficients for CD3C≡CCl were obtained. The potential function and isotope effects on Raman intensity and Raman displacement of the CCl stretching vibration are discussed.

ISSN:0008-4042    

DOI:10.1139/v55-147

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

Monomesylhydrazide, 1-acetyl,2-mesylhydrazide, andsym-dimesylhydrazide were obtained by means of the Schotten–Baumann reaction. For comparison with these compounds the hydrazinium dimesylate, hydrazinium monomesylate, monomesylhydrazide mesylate, and monoacetylhydrazide mesylate were prepared. The preparation of dimesyldiimide by the action of metallic sodium on N,N-dichloromesylamide was attempted.

ISSN:0008-4042    

DOI:10.1139/v55-148

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

A gas–liquid partition chromatographic method for analysis of samples of the order of magnitude of a micromole is described. Examples of application are given.

ISSN:0008-4042    

DOI:10.1139/v55-149

出版商:NRC Research Press    

年代:1955

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v55-150

出版商:NRC Research Press    

年代:1955

数据来源: NRC