摘要:

AbstractIn the previous preliminary communicationA. P. de Jonge, Rec. trav. chim. 74, 760 (1955).on the chromatography of acid anilides an outline was given of the method.In this and forthcoming publications, details of the preparation, the ultraviolet and infra‐red absorption spectra and of the chromatography are described.In the present communication the preparation of saturated fatty acid anilides is described. The melting points of the pure acid anilides have been determined, and the relevant data compared with those given in the literature. In addition, the solubility in water of the first four members of the homologous series has been determined.In connection with analytical application, procedures are given for a quantitative preparation of the anilides starting from small amounts of acid or este

ISSN:0165-0513    

DOI:10.1002/recl.19560750102

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractIt has been found that V+5can be potentiometrically estimated by titrating it with W+5or U+4. The process is applicable to small quantities of vanadium as low as 30 γ the titration curves are smooth with sharp inflections. The most favourable results are obtained with W+5in the presence of 7‐8NHCl and 0.1‐8NH3PO4, both at room temperature and at 60°C. With U+4the best results are obtained in

ISSN:0165-0513    

DOI:10.1002/recl.19560750103

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractDer γ‐Halbaldehyd vonDL‐Glutaminsäure und der β‐Halbaldehyd vonDL‐Asparaginsäure wurden durch Zerlegung der entsprechenden Mercaptale dargestellt. Letztere dienten weiterhin zur Synthese der Aldehydopeptide Glycyl‐DL‐glutamal‐5, Glycyl‐DL‐glutamal‐5‐yl‐glycin und Glycyl‐DL‐aspartal‐4. Aus dem Verhalten dieser Peptide bei der Hydrolyse mit Salzsäure ist zu folgern, dass die genannten Aldehyde ‐ falls sie als Baustein von Proteinen auftreten würden ‐ in den entsprechenden Hydrolysat

ISSN:0165-0513    

DOI:10.1002/recl.19560750104

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractTrichlorotertiary butanol has been condensed with benzoic,ortho‐,meta‐, andpara‐chlorobenzoic,ortho‐,meta‐ andpara‐toluic, para‐nitrobenzoic and acetic acids. The esters so obtained have been examined and analysed. Antiseptic and insecticidal properties of these compounds will be examined and report

ISSN:0165-0513    

DOI:10.1002/recl.19560750105

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractQuadrivalent vanadium occurring in alkaline solutions as alkali vanadite can be readily oxidized by permanganate. The latter is reduced either to manganate in the presence of Ba+2ions or to MnO2. These reactions proceed almost quantitatively under certain conditions. A method for the estimation of vanadium is developed, based upon the oxidation of V+4to V+5with excess KMnO4in alkaline medium, followed by titrating the excess of oxidant with formic acid or monovalent thallium. The method is applicable to quantities of V+4as low as 604 γ

ISSN:0165-0513    

DOI:10.1002/recl.19560750106

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractFreezing‐point curves have been determined, by an approximately static method, in the temperature range 20‐90°C for binary systems of ϵ‐caprolactam with palmitic, benzoic, adipic and pimelic acid. The molecular compound formation, shown to occur from the diagrams, points to specific interaction between one carboxyl group and one caprolactam‐am

ISSN:0165-0513    

DOI:10.1002/recl.19560750107

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractA simple synthesis of the alkaloid (±)‐sedamine, which gives further proof of its assumed structure, is reported; some improvements on a known synthesis are also given.From the mother liquors of the former syntheses a diastereoisomer of (±)‐sedamine, which is named (±)‐isosedamine, has been isolated.(±)‐Sedamine was resolved and (−)‐sedamine is described. The various stereoisomers are discussed also in relation to their i

ISSN:0165-0513    

DOI:10.1002/recl.19560750108

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractAn adiabatic calorimeter has been developed for the measurement of the heat of solution. By means of a thermistor temperature changes of about 0.04°C can be measured with a precision better than 4 × 10−5°C, hence only small amounts of solute are required. As a check of accuracy the integral heat of solution of KCl in H2O at 25°C up to a concentration of 2 × 10−4molar was directly determined as 17.24±0.03 kj per moleFor the “uncertainty interval” is used twice the standard deviation of the mean, i.e., as recommended bij F. D. Rossini and W. E. Deming, J. Wash. Acad. Sci. 29, 416 (1939). The probability that the measured quantity lies within this l

ISSN:0165-0513    

DOI:10.1002/recl.19560750109

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractThe condensation of N‐methyl‐α‐piperidol (I), which we consider to be a cyclic tautomer of 5‐methylaminopentanal (II), with benzoylacetic acid is reported to give α‐phenacyl‐N‐methylpiperidine (“Sedamine‐ketone”, IVa) in yields up to 50% depending on the pH of

ISSN:0165-0513    

DOI:10.1002/recl.19560750110

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY

摘要:

AbstractIn this communication the ultra‐violet spectra in different solvents of the anilides of the homologous series of straight‐chain fatty acids from formic acid to capric acid (C10) and of the higher acids with an even number of carbon atoms as far as stearic acid (C18) are discus

ISSN:0165-0513    

DOI:10.1002/recl.19560750111

出版商:WILEY‐VCH Verlag    

年代:1956

数据来源: WILEY