摘要:

Quantitative chromatography of ethylenediamine dihydrochloride onunwashedWhatman No. 17 paper int-butanol:acetic acid:water (2:1:1) resulted in a 1% conversion to ethylenediamine diacetate (RF0.51) and a 98% recovery of the dihydrochloride (RF0.28). The cause of the multiple zoning, which was not observed on acid-washed papers, was traced to minor quantities of alkaline earth metals which are present as impurities inunwashedpapers. Ion exchange mechanisms are suggested to account for the observed conversion. Quantitative chromatography of ethylenediamine diacetate onunwashedor acid-washed Whatman No. 17 paper int-butanol:0.5% hydrochloric acid (3:1) resulted in quantitative recovery of the dihydrochloride due to displacement of the weak acid in the substrate by the strong acid in the solvent system.

ISSN:0008-4042    

DOI:10.1139/v63-011

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The present status of sulphenes (R′R″C:SO2) as stable entities or chemical intermediates is discussed. The early report by Locher and Fierz (Helv. Chim. Acta,10, 642 (1927)) of the preparation of a stable crystalline sulphene has been investigated; it is concluded that their claim is unfounded.The irradiation of unsaturated sultones in the presence of methanol is shown to give sulphonic esters: the corresponding thermal reaction of sultones is known to lead to sulphonic acid derivatives. It is proposed that the irradiation of unsaturated sultones yields sulphenes, which then react with the medium.

ISSN:0008-4042    

DOI:10.1139/v63-012

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

When dissolved in fused alkali nitrate, manganese (II) is oxidized to MnO2. In the same solvent MnO4−decomposes to MnO2. Peroxide ion arrests the decomposition at MnO42−, while the presence of hydroxide ion results in the formation of MnO43−. The spectra of MnO42−and MnO43−in molten nitrate show great similarity to their spectra in alkaline aqueous solution.

ISSN:0008-4042    

DOI:10.1139/v63-013

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The partition of beryllium and aluminum between aqueous thiocyanate solutions and several organic solvents was determined under a variety of experimental conditions. From these batch studies it was concluded that a two-solvent countercurrent extraction of beryllium from a thiocyanate solution should give good recovery of beryllium with effective separation from aluminum and, by inference, other inert gas configuration cations.

ISSN:0008-4042    

DOI:10.1139/v63-014

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The isolation of carbon atoms 2 and 3 of the α-pyridone nucleus of ricinine is described. Evidence is provided to support the suggestion that succinic acid or a closely related four-carbon dicarboxylic acid provides carbon atoms 2, 3, and 7 in the biosynthesis of the ricinine molecule.

ISSN:0008-4042    

DOI:10.1139/v63-015

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

An extensive study is made of the use of sulphur as a monitor for neutrons with energies from 2 to 20 Mev. Irradiated disks of pressed sulphur are burnt before counting to increase the efficiency and reproducibility of determining the P32activity. It was established that on burning irradiated sulphur 95.5 ± 0.5% of the P32activity is retained with a reproducibility of ± 1.0%. Measurements of relative cross sections for the S32(n,p) P32reaction have been extended to 20.3 Mev using the T (d,n) He4and D (d,n) He3reactions to produce monoenergetic neutrons. Neutron production using Zr−T targets is examined as is the effect of extraneous neutrons from the D (d,np) D process on the S32(n,p) reaction.

ISSN:0008-4042    

DOI:10.1139/v63-016

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The aminolysis reactions involving primary amines with either Ti(NMe2)4or Ti(NEt2)4have been studied. The primary amines behave as bifunctional reactants, forming colored, insoluble, non-volatile bis-(primary amino)-titanium compounds Ti(NR)2which (except for R = C6H5) are highly reactive towards water or alcohols. Withn-butylamine, some soluble polymers of the general formula Tix(NBun)2x−2(NEt2)4were isolated. Withtert-butyl-amine the dimers Ti2(NBut)2(NMe2)4and Ti2(NBut)2(NHBut)2(NMe2)2were obtained. The structures of these polymeric metal–nitrogen compounds are discussed.

ISSN:0008-4042    

DOI:10.1139/v63-017

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The rates of rearrangement of several aminochromes have been measured in: (1) water, (2) aqueous sodium hydroxide, and (3) aqueous zinc acetate. The rates were found to be first order with respect to aminochrome concentration in each reaction medium, and to zinc acetate concentration. However, no simple kinetic relationship between the rate of rearrangement and alkali concentration was detected. The rate increased very rapidly with increasing alkali concentration.Mechanisms for these rearrangements are suggested, based on the influence of substituents in the 1-, 2-, and 3-positions of the aminochrome molecule on the kinetic and thermodynamic features of the reaction.

ISSN:0008-4042    

DOI:10.1139/v63-018

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The proton resonance spectra of solutions of acetamide,N,N-dimethylacetamide, formamide, andN,N-dimethylformamide in fluorosulphuric acid have been studied at temperatures between 25° and −98°. At low temperatures a new peak appears in the spectra of solutions of all four compounds which is not present at room temperatures and which, from peak areas and other consideration, may be assigned with certainty to thegroup. It is thereby unambiguously established that these amides protonate on the carbonyl oxygen and not on the nitrogen atom.

ISSN:0008-4042    

DOI:10.1139/v63-019

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The preparation of 16β-carboxy-(5α)-17α-pregnane-3β-ol-20-one and 16β-carbomethoxy-3β-fluoro-17α-Δ5-pregnene-20-one, as well as several of their derivatives, is described. The stereochemistry of these compounds is deduced from their optical rotatory dispersion curves.

ISSN:0008-4042    

DOI:10.1139/v63-020

出版商:NRC Research Press    

年代:1963

数据来源: NRC