摘要:

AbstractThe structure of interhalogen compounds, polyhalide ions, and positive polyhalogen ions is discussed in terms of the LCAO‐MO method. The molecular orbitals were represented by a linear combination of the outerp‐orbitals of the halogen atoms. The Coulomb integrals were considered as a function of the electro‐negativity and the formal charge of the atoms.It is found that application of this method gives a consistent qualitative explanation of the bond angles, atomic configurations, and bond lengths in all polyhalogen comp

ISSN:0165-0513    

DOI:10.1002/recl.19590781002

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe U.V. absorption spectra of a series of benzophenone oximes are discussed. Notwithstanding relatively small differences in absorption of the isomers, incontestable conclusions as regards configurations can be drawn, even if only one of the conceivable isomers is available. The results agree with what might be expected on the assumption that theBeckmannrearrangement proceeds via ananti‐migratio

ISSN:0165-0513    

DOI:10.1002/recl.19590781003

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractA comparison of spectral data on benzophenone oximes in concentrated sulphuric acid and those of benzophenones in ethanol oriso‐octane suggests phenyl‐phenyl interaction as absorption mechanism for benzophenone oximes in concentrated sulphuric a

ISSN:0165-0513    

DOI:10.1002/recl.19590781004

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractMany metal ions form soluble complexes with pyro‐ and tripolyphosphate. Complex formation entails a decrease in pH. By measuring the pH and in some cases the concentration of free metal ions, equilibrium constants for a number of metal‐phosphate complexes were determined at 25° and at 40°. Activity corrections were applied. The tendency to form complexes increases in the following order:\documentclass{article}\pagestyle{empty}\begin{document}\[{\rm Cs}\sim {\rm K} \sim{\rm Na} < {\rm Li} < {\rm Ba} < {\rm Sr} < {\rm Ca} < {\rm Mg} < {\rm Cd} \sim{\rm Zn} \] \end{document}Tripolyphosphate has somewhat stronger complexing properties than pyrophosphate. The influence of the temperature is in most cases small. Constants obtained are listed in Ta

ISSN:0165-0513    

DOI:10.1002/recl.19590781005

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe behaviour in ethanolamine of some aromatic polynitro compounds and compounds containing active methylene groups has been studied cryoscopically. It is suggested thats‐trinitrobenzene,s‐trinitro‐t‐butylbenzene, and picramide ionise by the proton‐transfer mechanism.s‐Trinitroanisole, besides exhibiting a similar behaviour, undergoes a solvolytic reaction, the methoxyl group being replaced by NH.CH2CH2OH. Picric acid ionises as (NO2)3C6H2OH → (NO2)3C6H2O−+ H+. Diethyl malonate, ethyl acetoacetate, and acetylacetone undergo solvolysis. Bis(phenylsulphonyl)methane ionises by the proton‐t

ISSN:0165-0513    

DOI:10.1002/recl.19590781006

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe dipole moments of someortho‐substituted nitrobenzenes are discusse

ISSN:0165-0513    

DOI:10.1002/recl.19590781007

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractAn investigation of methods for the extraction and analysis of lipids from human arteries is described. The analytical procedure developed has been tested for completeness of separation and absence of artefact formation. It can be applied to lipid mixtures amounting to as little as 50 mg or in some cases even less. The lipids can be separated into phospholipids, free fatty acids, sterol esters, and glycerides plus free sterols, and the fatty acid mixtures from these fractions analysed by gas chromatography after methylation. Examples of such analyses are given.

ISSN:0165-0513    

DOI:10.1002/recl.19590781008

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractStarting from ten selected σ values, a large number of ϱ values is calculated; these ϱ values in their turn serve to calculate other σ values. The results prove that the concept of “duality of σ constants” is erroneous. In those cases in which a substituent enters into mesomericparainteraction with the reaction centre, a multiplicity of (exalted) σ values is observed; this holds for +M as well as for −M substituents. In the absence of mesomericparainteraction σ values are reasonably constant; the mean of such σ values (σn) is listed.It is demonstrated that σ values are, in general, not suitable for judging mesomericparainteractions, and should be replaced by the (free) energy difference term\documentclass{article}\pagestyle{empty}\begin{document}\[- \Delta \Delta F_p = \varrho (\sigma - \sigma ^n) \times 2.303\,RT, \]\end{document}involving not only the exaltation of σ, but ϱ andTas well. Several important applications of this concept are discussed, illustrating the way in which the ϱσ relationship can be most profitably used for mechanistic and

ISSN:0165-0513    

DOI:10.1002/recl.19590781009

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19590781001

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY