摘要:

AbstractStarting fromcis‐ andtrans‐cyclohexane‐1,4‐dicarboxylic acid,cis‐andtrans‐1,4‐dimethylcyclohexane are prepared in a way that leaves no doubt as to the configuration of the lat

ISSN:0165-0513    

DOI:10.1002/recl.19610800602

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe preparation of pure low‐melting 4‐methylcyclohexanecarboxylic acid (m.p. 30.5‐31.5°) is described for the first time.By chemical means it is proved that low‐melting 4‐methylcyclohexanecarboxylic acid possesses thecis‐configuration and the high‐melting isomer thetrans‐configuration. For this purpose these acids were converted intocis‐ andtrans‐1,4‐dimethylcyclohexane respectively, using reactions which take place without any change of configuration at the cyclohexane nucleus. The configuration of these two hydrocarbons has been proved in the firs

ISSN:0165-0513    

DOI:10.1002/recl.19610800603

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe action of silver diphenyl phosphate on a diacylglycerol‐α‐iodohydrin or the isomeric diacylglycerol‐β‐iodohydrin in benzene as medium gives the diphenyl diacylglycerol‐α‐phosphate in practically equal and very satisfactory yields. In the latter case therefore a migration of an acyl group from an α‐ into the β‐position occurs.The reaction has been studied for the compounds with stearoyl, 4‐methoxybenzoyl, and 2,6‐dimethyl‐4‐nitrobenzoyl as the acyl group. It proceeds almost equally smoothly in all cases.On the basis of these facts the reaction me

ISSN:0165-0513    

DOI:10.1002/recl.19610800604

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractIt has been shown that di‐p‐styrenyl derivatives of germanium, tin, and lead as well as 1,4‐divinylbenzene and 3,9‐divinylspirobi(meta‐dioxan) react with diphenyltin dihydride to yield linear poly‐addition polymers containing tin or tin and germanium or lead in the main polymer chain. The polymeric products have been characterized by infrared spectroscopy, analytical data and molecular weight.Reactions of triphenyltin hydride and diphenyltin dihydride with mono‐ and di‐p‐styrenyl derivatives of germanium, tin, and lead yielding monomeric compounds containing two and three hydrocarbon‐linked metal atoms, have al

ISSN:0165-0513    

DOI:10.1002/recl.19610800605

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe Debije‐Scherrer diagram of “natural” L(+)‐muscarine‐di‐p‐toluyl‐hydrogen‐D(−)‐tartrate‐hemihydrate is compared with the diagrams of muscarine‐di‐p‐toluyl‐hydrogen‐D(−)‐tartrates resulting from the resolution of two DL‐muscarine preparations. One of the latter diagrams proved to be identical with the diagram of “natural” L(+)‐muscarine‐di‐p‐toluyl‐hydrogen‐D(−)‐ta

ISSN:0165-0513    

DOI:10.1002/recl.19610800606

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractA survey is given of the existing methods for measuring the surface tension from the geometry of sessile drops. These methods, which generally consist of the measurement of simple drop dimensions, are insufficiently accurate for use with adsorption studies.A new procedure is described to find the surface tension by means of a graphical evaluation of the drop shape factor β (the constant shape factor as defined inBashforthandAdam's treatment of the sessile drop). In this way the accuracy is considerably increased (0.1% uncertainty in γ).The interfacial tension of the system mercury/0.05MNa2SO4at −0.460 Vvs.saturated calomel electrode, and at 25°, is found to be 426.2 ± 0.2 dynes/cm, which agrees well with the liter

ISSN:0165-0513    

DOI:10.1002/recl.19610800607

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractA theory is given for the behaviour of contact angles, as a function of the concentration of surface active substances, observed in wetting and de‐wetting experiments of metal and mineral surfaces.It is shown, that the change of the contact angle with solute concentration can be related quantitatively to the adsorption densities at the three interfaces, which meet at the line of contact.Some published results are discussed in terms of the theory develope

ISSN:0165-0513    

DOI:10.1002/recl.19610800608

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractIn a Cailletet apparatus the solubility of naphthalene in supercritical ethylene has been determined quantitatively up to pressures of 200 atm, by visually measuring P‐T sections at constant compositio

ISSN:0165-0513    

DOI:10.1002/recl.19610800609

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractAn apparatus is described by means of which quantitative P‐T measurements can be carried out visually, at constant composition, up to pressures of 1000 atmospheres. This apparatus is used for measuring the solubility of naphthalene in supercritical ethylen

ISSN:0165-0513    

DOI:10.1002/recl.19610800610

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractOur two previous articlesG. S. A. van WelieandG. A. M. Diepen, Rec. trav. chim.80, 659 (1961).Idem, ibid.,80, 666 (1961).and some supplementary observations enabled us to derive a number of sections and projections of the P‐T‐x space model of the ethylene‐naphthalene system, within the following limits of measurement: 0 to 1000 atm, 0 to 100 moles % naphthalene and 20° to 115°. An important result of our discovery is that the critical conditions of the second critical point are: P = 174.0 atm, T = 52.1° and x = 17 moles % ± 0.5.On the L2= G curve we have found a pressure maximum at 244 atm

ISSN:0165-0513    

DOI:10.1002/recl.19610800611

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY