摘要:

AbstractThe syntheses and absorption spectra in visible light of condensation products of retinal and retinylideneacetone with several cyanoacetic esters and related compounds are reported.

ISSN:0165-0513    

DOI:10.1002/recl.19660850402

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe preparation and spectra in visible light, of a number of fulvenes and benzofulvenes in the vitamin A series are described.

ISSN:0165-0513    

DOI:10.1002/recl.19660850403

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractPreparation, reactions and spectra of condensation products of β15‐, β17‐, β20‐and β22‐aldehyde with 1,4‐dicyano‐2‐but

ISSN:0165-0513    

DOI:10.1002/recl.19660850404

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

Abstractβ‐Acetylthiomethyl‐α‐tetronic acid (4‐acetylthiomethyl‐3‐hydroxy‐2,5‐dihydrofuran‐2‐one, X) with the boron trifluoride complexes of (substituted) benzaldehyde(s) yielded 2‐aryl‐7‐oxo‐5,7‐dihydro‐4H‐furo[3,4‐e]‐1,3‐oxathiins (V). This new ring‐closure is discussed as a potential step toward a synthesis of the cephalosporin C antibiotics.The nuclear magnetic resonance spectra of the compounds V show that the long‐range spin‐spin coupling of pr

ISSN:0165-0513    

DOI:10.1002/recl.19660850405

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe kinetics of the isomerization ofp‐ andm‐t‐butylbenzenesulfonic acid have been studied in 74.0 wt‐% sulfuric acid at elevated temperatures. The isomerization is accompanied by dealkylation. Evidence was obtained that the formation of benzenesulfonic acid fromp‐t‐butylbenzenesulfonic acid proceeds mainly by a three‐step process,viz., desulfonation, dealkylation and sulfonation of the benzene produced. Withm‐t‐butylbenzenesulfonic acid, however, there is an indication of additional dealkylation of the sulfonic acid itself. Desulfonation rate constants were calculated. The activation energies for desulfonation are of the order of 27

ISSN:0165-0513    

DOI:10.1002/recl.19660850406

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractA number of 1,1,2‐triphenylethylenes bearing trifluoromethyl substituents in various positions have been synthesized and their oestrogenic activity investigated. It is shown that the introduction of trifluoromethyl groups decreases the oestrogenicity, this effect being more pronounced in theparaderivatives than in theorthoandmetaisomers. Possible explanations for this effect are discusse

ISSN:0165-0513    

DOI:10.1002/recl.19660850407

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractA description is given of the synthesis of dimeric α‐nitrosocyclohexanecarboxylic acid (III). This acid provides the first example of the hitherto unknown class of α‐nitrosocarboxylic acids. It is shown that III is not an intermediate in the nitrosodecarboxylation of cyclohexanecarboxylic acid to caprol

ISSN:0165-0513    

DOI:10.1002/recl.19660850408

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe complex formation ofn‐propyl bromide and isopropyl bromide with aluminium bromide in carbon disulfide has been investigated by means of microwave measurements. The results are explained with the formation of 1: 1 complexes according to:\documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}$$ 2\,\,n - {\rm C}_3 {\rm H}_7 {\rm Br} + {\rm Al}_2 {\rm Br}_6 \rightleftarrows 2\,\,n - {\rm C}_3 {\rm H}_7 {\rm Br} \cdot {\rm AlBr}_3 $$\end{document}\documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}$$ 2\,\,iso - {\rm C}_3 {\rm H}_7 {\rm Br} + {\rm Al}_2 {\rm Br}_6 \rightleftarrows 2\,\,iso - {\rm C}_3 {\rm H}_7 {\rm Br} \cdot {\rm AlBr}_3 $$\end{document}with the equilibrium constants K9= 1.3 1/mole and K3= 7.30 1/mole at 24.0°. The isomerization reaction goes to completion within the analytical errors of the techniques used. The reaction rate appeared to be a function of then‐C3H7Br concentration and the aluminium bromide concentration over a wide range of intake ratios:\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm v} = {\rm k}\,\,[n - {\rm C}_3 {\rm H}_7 {\rm Br}][{\rm Al}_2 {\rm Br}_6 ] $$\end{document}with k = 0.71 1 · mole−1· min−1at 24°.The reaction mechanism i

ISSN:0165-0513    

DOI:10.1002/recl.19660850409

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe synthesis is described of a number of derivatives of 10,11‐dihydro‐5H‐dibenzo[a,d]cycloheptene, with basic substituents in the ethylene bridge. Moreover, a method is reported for the preparation of amino ethers of5H‐dibenzo‐[a,d]cyclohep

ISSN:0165-0513    

DOI:10.1002/recl.19660850410

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractIn this paper the spectral behaviour at different temperatures of solutions of anhydrous CoCl2in water, methanol, ethanol, 1‐propanol, 2‐propanol, and acetone is reported and discussed. The work was initiated by the striking colour changes observed in some of these solvents when the temperature is lowered well below room temperature. The effects are interpreted in terms of octahedral‐tetrahedral configurational changes of solvated Co2+complexes. A number of earlier observations, which are relevant to the ones reported here and most of which support the interpretation given, are briefly reviewed and disc

ISSN:0165-0513    

DOI:10.1002/recl.19660850411

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY