摘要:

AbstractThe side‐chain chlorination of substituted toluenes as well as the atomic chlorination of some aliphatics t‐butyl‐X were investigated, using sulphuryl chloride as the chlorinating agent.In both cases marked polar effects were observed. As in previous experiments with other strongly electronegative free radicals electronattracting groups cause a decrease in reactivity whereas electron‐repelling groups facilitate hydrogen

ISSN:0165-0513    

DOI:10.1002/recl.19540730402

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractThe exchange of sulphate ions labelled with sulphur 35 in solution with solid CaSO4· 2H2O and CaSO4· 1/2 H2O was studied in saturated solutions at 80° C containing orthophosphoric acid of different concentrations. When the solid phase did not undergo transformation, no appreciable exchange was observed. However, when a transformation into a different modification took place, this was accompanied by total exchange. This indicates that the transformationsall take place by the growth of nuclei of the new phase from the solution, thus excluding a zeolithic nature of these phase changes as suggest

ISSN:0165-0513    

DOI:10.1002/recl.19540730403

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractSome physico‐chemical properties of the system HNO3‐SO3are described. From the melting point curve the existence of some crystalline compounds could be derived. The very stable compound HNO3. 2SO3was isolated (m.p. 112° C), a compound ‐ possibly 2HNO. 3SO3‐ was found (m.p. 106° C), and a compound HNO3. 3SO3could be isolated (m.p. 41° C).Liquid HNO3and SO3are not completely miscible. Between 90% SO3and nearly 100% SO3there exists a miscibility gap.The vapour pressure diagram of the system HNO3‐SO3was also determined. The minimum in this diagram corresponds to HNO3. 2SO3. The vapour of mixtures on the HNO3side of this minimum contains HNO3and N2O5. On the SO3side of the minimum of vapour contains SO3.It is posible to absorb most of SO3from contact gas in mixtures with 80‐82% of SO3at 25° C. In molten HNO3. 2SO3at 110° C the absorption of contact gas proceeds with a y

ISSN:0165-0513    

DOI:10.1002/recl.19540730404

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractTwo syntheses of the hitherto unknown 5‐bromothiazole are described. 2‐Bromothiazole and 5‐bromothiazole could be convertedviathe corresponding thiazolyllithium compounds into thiazole‐2‐ and thiazole‐5‐carboxylic acid respectively. This constitutes a new convenient synthesis of these acids, which up to now were rather difficult

ISSN:0165-0513    

DOI:10.1002/recl.19540730405

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractLes auteurs décrivent une méthode pour la détermination des aminoacides par photométrie directe des bandes colorées, obtenues par la chromatographie sur papier.Les facteurs qui influencent la reproductibilité des expériences ont été étudiés.L'analyse de deux protéines effectuée avec cette méthode donne des résultats qui correspondent aux chiffres, trouvés dan

ISSN:0165-0513    

DOI:10.1002/recl.19540730406

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractPolyglycine and polyalanine obtained by polymerization of their N‐carbonic anhydrides often appeared to contain more acid groups than amino groups. This is ascribed, at least partly, to the formation of hydantoin groups.A small amount of 2,5‐diketopiperazine was isolated from polyglycine.A discussion of the results and their bearing upon the calculation of molecular weights is gi

ISSN:0165-0513    

DOI:10.1002/recl.19540730407

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19540730408

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19540730401

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY