ISSN:0021-8871    

DOI:10.1002/jctb.5010120111

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractThe preparation and properties of some tetra‐(aminoalkoxy)silanes are described, and the alcoholysis of tetra‐(2‐aminoethoxy)silane confirmed. Attempts to prepare some mixed alkoxy‐(aminoalkoxy)silanes by partial alcoholysis of tetra‐alkoxysilanes were unsuccessful, because of re‐distribution of the org

ISSN:0021-8871    

DOI:10.1002/jctb.5010120102

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractThe thermal transformation of boehmite (alumina monohydrate) prepared hydrothermally from alumina trihydrate (hydrargillite or bayerite) to α‐alumina has been studied byX‐ray diffraction and infra‐red spectra.As a result, it is seen that the thermal transformation of boehmite proceeds in the following sequence.Boehmite → γ‐alumina → δ‐alumina → θ

ISSN:0021-8871    

DOI:10.1002/jctb.5010120103

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractA method for measuring the drainage rates of single liquid films by the movement of interference fringes is described. It is shown that the cross‐section of a fast draining film is wedge‐shaped and so its average thickness equals the thickness at its mid‐height. Various degrees of water hardness produced changes in the drainage rate of a single film that were consistent with the changes produced in the drainage rate of high‐expansi

ISSN:0021-8871    

DOI:10.1002/jctb.5010120104

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractA study was made of the transfer of isobutyl groups from aluminium to tin, which appears to be reversible. An equilibrium is reached in each case, the position of which is determined by the total number of isobutyl groups present and the ratio Al/Sn. The results are presented in one single graph.Special attention was given to the alkylation of stannic chloride with tri‐isobutylaluminium and the influence of alkali chlorides on this reaction. Addition of alkali chlorides in various amounts leads to a more complete transfer of isobutyl groups to the tin ato

ISSN:0021-8871    

DOI:10.1002/jctb.5010120105

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractThe conversion of a commercial vapour fractometer to operate with capillary columns is described.This apparatus was used with a squalane stationary phasepat 100°, to examine several kerosene‐type solvents which have already been used, or which might be used in the future, as inert diluents for TBP extraction systems.Several chromatograms are presented and discussed and these serve to demonstrate the remarkable potentialities of capillary columns and ionisation detectors for work of this natu

ISSN:0021-8871    

DOI:10.1002/jctb.5010120106

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractThe polymerisation of dec‐1‐ene has been studied using catalysts prepared by mixing titanium tetrachloride and triethylaluminium. The properties of the polymers vary with the ratio of the two components used to prepare the catalyst, with the concentration of the catalysts, and with the reaction temperature. When the catalyst is prepared by mixing the components at molar ratios of lower than about 0.8:1, liquid polymers are obtained. At catalyst ratios greater than 1:1, waxy polymers are formed. The difference may arise from a difference in the reaction mechanism which is considered to be predominantly cationic at the lower ratios (1:1). Evidence for this conclusion is discussed. Under the cationic conditions the polymerisation is sensitive to solvent and when benzene is used it is involved chemically in the polymerisation. At high ratios benzene acts as an inert solvent. The properties of the polymers obtained using Ziegler catalysts are compared with those obtained using catalysts based on aluminium chlor

ISSN:0021-8871    

DOI:10.1002/jctb.5010120107

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractDimethyl pyridine‐3,4‐dicarboxylate was conveniently prepared in 44% yield by the oxidation of isoquinoline with concentrated nitric acid. On acid hydrolysis, the dicarboxylic acid was quantitatively obtai

ISSN:0021-8871    

DOI:10.1002/jctb.5010120108

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractA new method of estimating the content of phenols in road tar, developed from the methods described in Parts I and II, is described. Potentiometric titrations with potassium methoxide have been made on tars from various crude sources. The results are expressed in terms of the ‘neutralisation value’, i.e. the weight of potassium methoxide required to neutralise the phenols in 1 g. of tar.The results are lower than those obtained by the benzoylation method. It is thought that the potentiometric results probably give a more reliable indication of the phenol content of a tar because benzoic anhydride tends to react, not only with phenolic groups in tar, but also with labile hydrogen at

ISSN:0021-8871    

DOI:10.1002/jctb.5010120110

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY