摘要:

AbstractThe general equation for liquid film resistance to gas absorption in scrubbers, derived by us in a previous paper1), was applied to experiments ofCryderandMaloney2), treating the absorption of carbon dioxide in diethanolamine solutions. Our equation proved to be valid also in this case, when it is assumed that the reaction is a pseudo‐third order reaction. In reality it will be a succession of two second order reactions, as no temperature influence on the reaction velocity constant is foun

ISSN:0165-0513    

DOI:10.1002/recl.19470660202

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractThe effective permittivity of compressed and sintered samples of TiO2is measured. The results are discussed in terms of the theory developed byPolderandvan Santen.

ISSN:0165-0513    

DOI:10.1002/recl.19470660203

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractThe isolation of the semicarbazone C47H69O7N3, from a semicarbazone fraction of the cholesterol oxidation is described. This semicarbazone is a double compound betweentrans‐dehydroandrosterone acetate semicarbazone and a lactone C25H36O4, previously described byMiescherandFischer.The structure of this lactone was examined and proved to be Δ5,6‐acetoxy‐3 β‐hydroxy‐17‐nor‐cholen

ISSN:0165-0513    

DOI:10.1002/recl.19470660204

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractA new synthesis of 7‐dehydrocholesterol (provitamin D3) from cholesterol is described, which gives a higher yield than the well knownWindaussynthesis. The synthesis is carried out via a 7‐bromocholesteryl ester, from which hydrogen bromide is eliminated to give an ester of 7‐dehydrocholesterol.Careful hydrolysis of the impure 7‐bromocholesteryl benzoate affords either 7‐α‐ or 7‐β‐hydroxycholesteryl‐3 benzoate depending on the reagent. The two epimeric 7‐bromocholesteryl benzoates are prepared from the hydroxy‐compounds by interaction with phosphorus tribromide; the two hydroxy‐compounds are

ISSN:0165-0513    

DOI:10.1002/recl.19470660205

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19470660206

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractBy heatingl‐ecgonine in weakly acidified aqueous solution and also in strong hydrochloric acid solution,l‐ecgonine is converted to the extent of 10.5‐12.5% into d‐φ‐ecgonine, an equilibrium mixture of ecgonines being formed.Bothl‐ andd‐φ‐ecgonine give black crystals likel‐ecgonidine with hydriodic acid solution containing iodine; these crystals, when boiled with water, give solutions which show respectively leavo‐ and dextro‐gyratory rotations.On boilingl‐ecgonine as an alkali‐salt in saturated alkali chloride solution, another equilibrium is reached between the ecgonines; the sodium salt gave a 86.9% conversion intod‐φ‐ecgonine, the potassium salt one of 69% a

ISSN:0165-0513    

DOI:10.1002/recl.19470660207

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractThe derivation of theFuossdistribution function for ion pairs in a strong electrolyte is discussed. An improvement of this function is proposed which is adapted to the calculation of the number of associated pairs. In a simple case the association is computed with the corrected and uncorrected functions and compared with the exact value obtained from the law of mass action.

ISSN:0165-0513    

DOI:10.1002/recl.19470660208

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19470660209

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19470660210

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY

摘要:

AbstractAfter a brief description of a new apparatus for the determination of heats of combustion, the theory of an isothermally jacketed calorimeter is discussed. Several factors which require attention in accurate determinations are dealt with, viz.: purity of reagents, completeness of the combustion reaction, determination of time, determination of weight and corrections of the second order. A description is then given of some details of the apparatus and method. The accuracy attained, 0.01‐0.02%, is demonstrated in a series of experiments. Finally, it is shown that the heat of combusiton of our sample of benzoic acid is in excellent agreement with that of preparation 39b of the National Bureau of Standards, Washingto

ISSN:0165-0513    

DOI:10.1002/recl.19470660211

出版商:WILEY‐VCH Verlag    

年代:1947

数据来源: WILEY