摘要:

AbstractThe reaction of trans‐1‐phenylbutadiene‐1.3 with aqueous formaldehyde solution in the presence of an acid catalyst has been studied. The main reaction product is shown to be trans‐4‐styryl‐m‐dioxane. The structure and properties of both this compound and its hydrogenation product

ISSN:0165-0513    

DOI:10.1002/recl.19530720902

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractIt has been shown that there is a very highly significant correlation coefficient between the work function (Φ) of metals and the activation energy for oxidation (E). The values of Φ‐E tend to decrease slightly with increase in the atomic num

ISSN:0165-0513    

DOI:10.1002/recl.19530720903

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractIn this communication we make an investigation in the domain of concentrated electrolytic solutions on a larger scale and of a more profound kind than was possible in 19371). Principally use is made of depressions of vapour pressure determined byTammann, if possible up to a weight‐normal concentration (nω) = 10.Raoult's law (in the domain of vapour pressures), combined with ideas ofArrhenius, leads to the calculation of degrees of ionisation. The values found necessitate the assumption of hydration of ions or of ion pairs and ions.Remydetermined ion hydrations by a direct method. The literature on the subject was difficult to survey and not very convincing2).Thus various ideas lead to the study of footnote 1 and of this communication1Can the assumption of ion hydration cooperate in the explanation of the anomalies acknowledged byArrhenius himself?2Can ion hydrations be calculated in the above way?3Can further insight be obtained that way into the nature of concentrated electrolytic solutions?We began our exploration at the time without taking into account the effect of forces acting between the ions on the observed depressions of vapour pressure because their total effect could not be calculated. We have now worked up allTammann's data and have not found a single electrolyte which gives exclusively naked ions. This did not make that total effect any clearer. We had to organize this expedition in the same way, in the footsteps of my former teacher the late Prof. M.de Haas, who always insisted on attempting to arrive at “Knowledge through Measurement” (“door meten tot weten”) and mindful of the words ofDebye3) and ofRemy2). The results have indeed often surprised us and spurred us t

ISSN:0165-0513    

DOI:10.1002/recl.19530720904

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720905

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720906

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720907

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractOn décrit dans ce travail une série de cétones dérivées du 4‐hydroxy‐biphényle ayant une constitution analogue à celle de la ρ‐hydroxypropiophénone, et pouvant ainsi présenter un intérét biologique; quelques dérivés hétérocycliques de ces cétones ont ég

ISSN:0165-0513    

DOI:10.1002/recl.19530720908

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720909

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720910

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720911

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY