摘要:

AbstractIn strongly acidic media alkanes react as hydrogen donating agents towards the positive radical ions of anthracene, perylene and tetracene. The aromatic radical ions appear to be converted into their related proton complexes. These proton complexes reduce quinones to hydroquinones. Qualitative data on the latter reaction are discussed in relation to its mechanism. A direct reduction of quinones by alkanes has not been observed.

ISSN:0165-0513    

DOI:10.1002/recl.19670860902

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19670860903

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractExisting methods for the estimation of the primary medium effect for individual ions are critically reviewed and an improved method for its estimation is developed.By this method the primary medium effect of the hydrogen ion has been determined for the transfer from water to methanol‐water mixtures and methanol. The medium effect of the alkali and the halide ions are then also known. The accuracy of the values so obtained for the individual ions is of the same order as the accuracy of experimentally determined values for electroneutral combinations of ion

ISSN:0165-0513    

DOI:10.1002/recl.19670860904

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA study has been made of the influence of substitution by alkyl and phenyl groups in organic acids and bases on the interaction of the ions of these substances with the solvent.Knowledge of single ion activity coefficients is essential for the interpretation of the different effects.

ISSN:0165-0513    

DOI:10.1002/recl.19670860905

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractCyclo‐octyl radicals, generated by decomposition of di‐t‐butyl peroxide (DTBP) in cyclo‐octane, react with unsaturated compounds. The addition of cyclo‐octane to acrylic acid, crotonic acid, methyl vinylacetate or allyl alcohol yields the corresponding 1 : 1 adducts. Retention indices and NMR spectral data for these addition products

ISSN:0165-0513    

DOI:10.1002/recl.19670860906

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractIn a search for anticoagulants a number of 2,3‐di‐substituted 1,4‐naphthoquinones and 4‐hydroxycoumarins have been synthesized by allowing alcohols to react with 2‐substituted 1,4‐naphthoquinones and 4‐hydroxycoumarin. Some reflections are given on the mechanism of

ISSN:0165-0513    

DOI:10.1002/recl.19670860907

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractIn a search for compounds with anticoagulant activity analogues of 4‐hydroxy‐coumarin have been made in which the benzene nucleus has been replaced by thiophene. The compound 7‐hydroxy‐5‐thieno[3,2‐b]pyran‐5‐one (Ia) was obtained. From Ia two derivatives were prepared with substituents from known anticoagulants of the 4‐hydr

ISSN:0165-0513    

DOI:10.1002/recl.19670860908

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractBenzene‐trans‐diazosulfonate has in aqueous solution well‐defined absorption bands at 219, 290 and 416 nm, which are compared with similar bands in the absorption spectra of other azo‐compounds. The bands at 290 and 416 nm are the π→π* and n→π* absorptions, respectively. The band at 219 nm (229 in azobenzene) is assigned as π ‐ Φ*. The Φ ‐ π* band appears to be buried in the π ‐ π* band and lies at approximately 255 nm. It follows from these assignments that theΦ→Φ* band should be situated at 198 nm. The spectra of benzenediazosulfonates do indeed show a steep rise in absorption at wavelengths below 210 nm. The effects ofpara‐substitution on the observed bands is discussed. The π→π* and the π→Φ* bands show bathochromic shifts as the electron‐d

ISSN:0165-0513    

DOI:10.1002/recl.19670860909

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe electronic absorption spectra ofo‐ andm‐substituted benzene‐trans‐diazosulfonates in aqueous solution support the assignments given in Part III to the transitions inp‐substitutedtrans‐BDS. The intensity of the π→π* absorption decreases on OCH3‐trans‐BDS in the sequencepara>ortho>meta. The Φ→Φ*, π→Φ*, and Φ→π* absorptions are most intense in 3‐OCH3‐trans‐BDS. In 2‐Cl‐cis‐BDS the π→π* intensity is greatly reduced, whereas the Φ→Φ* intensity is unaffected bytrans‐cisisomerization. Electron‐with‐drawing substituents (‐NO2, ‐CO2H, halogen) do not have much influence on the locations of the absorption bands, but electron‐donating groups (‐CH3, ‐OCH3, ‐OH) produce bathochromic shifts of the same order in theortho, meta, andparapositions, whereas an intermediate place is taken by ‐SCH3and ‐SO3NA. The locations of the Φ→Φ* band (at 210 nm

ISSN:0165-0513    

DOI:10.1002/recl.19670860910

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractIn the diffusion through the boundary layer between electrolyte solutions indifferentmedia, the transport of uncharged particles comes into play. The contribution of this transport to the diffusion potential is measured for alkali halide solutions in methanol‐water mixtures. Using Δμ0‐values of individual ions in methanol‐water mixtures, the total diffusion potentials are calculated.It can be concluded that the diffusion potential between electrolyte solutions in different solvents depends mainly on the primary medium

ISSN:0165-0513    

DOI:10.1002/recl.19670860911

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY