摘要:

AbstractA. From the determination of the freezing points ofn. hexadecane,n‐hexadecene‐l (cetene and 8 mixtures of these substance it appared that the freezing point curve in this system can be represented by a very weakly curved line, so that this condensed system consists of an uninterrupted series of mixed crystals. The crystals that are in equilibrium with the mother liquor are somewhat richer in hexadecane than the liquid phase.The addition of hexadecane to cetene raises the freezing point of the lat

ISSN:0165-0513    

DOI:10.1002/recl.19380571002

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe method of Whitmore and of Cramer and Mulligan, for preparing alkenes by the thermal decomposition of the acetates of alcohols has been applied to some alcohols with straight and branched carbon chains. The acetates of pentanol‐3 and heptanol‐l respectively afford pentene‐2 and heptene‐1. The acetate of 2: 4‐dimethylpentanol‐3 affords 2: 4‐dimethylpentene‐2 and the acetate of 2: 4: 4′‐trimethylpentanol‐3 affords 2:4: 4‐trimethylpentene‐2. In these reactions no migration of the double bond occurs and no modification of the ca

ISSN:0165-0513    

DOI:10.1002/recl.19380571003

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe author investigates the explosion limit as a function of the pressure (below about 100 cm Hg). In the system H2‐O2there are between 8.4 and 9.8% hydrogen always two pressures, between which the mixtures are explosive. This is very much reminiscent of the inflammability regions at higher temperatures. The influence of spark strength, position of the electrodes, etc. on this so‐called “second limit” is described together with the procedure employed.Hydrogen‐air mixtures also give these phenomena.Similar peculiarities were found with carbon monoxide‐air, which will shortly b

ISSN:0165-0513    

DOI:10.1002/recl.19380571004

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractMit dem Ziel der Bildung von Additionsprodukten nachzuspüren und die etwaigen Additionsprodukte zu isolieren wurden Benzotrichlorid, Benzalchlorid, Benzylchlorid und Toluen mit einer für die Addition ausreichenden Menge Chlor im Sonnenlichte behandelt und die Reaktionsprodukte untersucht. Bei Toluen und bei Benzylchlorid findet an erster Stelle Chlorierung in der Seitenkette bis zum Benzalchlorid statt. Bei Benzalchlorid und Benzotrichlorid tritt hauptsächlich Addition a

ISSN:0165-0513    

DOI:10.1002/recl.19380571005

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractCaF2‐layers, obtained by sublimation in vacuo, consist of very thin laminae, which are only a few molecules thick. By heating these laminae become attached to each other, without growing together to form one crystal lattice, so that a remarkable decrease in the apparent surface may take place by this sintering process. On changing the amount of CaF2or the velocity of subliming the salt, the apparent surface, as measured by the adsorption of iodine may vary more than 100% and the question arises whether this is due to a variation in the thicknessdof the primary laminae or to a more or less pronounced degree of sintering, giving rise to an apparent thicknesssd(s = sintering factor) (§ 1). This apparent thickness is directly given by the ratio [CaF2]/[J2]max., whereas in studying the adsorption of caesium the ratio [CaF2]/[Cs)max.gives the value ofd/n, wherenis the number of Cs‐layers which can be adsorbed one over the other. This latter ratio is not affected by the sintering factors, as the adsorption of Cs completely destroys the effect of the sintering (§ 2). It is found that with increasing amount of CaF2the value ofd/nis practically constant. From this fact we may deduce that the average thicknessdof the primary laminae does not depend of the amount of CaF2.s.d., on the other hand, increases at first, whereas it decreases with greater amounts of CaF3(§ 4), table I). From the dependence ofs.d.upon the amount of CaF2(fig. 1) one may deduce thatsnearly = 1 with the smallest amounts of CaF2.dis found to be 6‐7 molecules of CaF2(§4), whereasn= 3 (§ 5). On decreasing the velocity of subliming, the thicknessdremains constant in this case too, but the sintering factor s varies again and may increase to near

ISSN:0165-0513    

DOI:10.1002/recl.19380571006

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractInvestigation of the influence of nitrogen, carbon dioxide and argon on the explosion limits of mixtures of hydrogen and oxygen. Mathematical investigation of the curves obtained in these experiments.

ISSN:0165-0513    

DOI:10.1002/recl.19380571007

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe theoretical considerations on the connection between the critical reaction velocity and the concentrations of the reacting substances have been supplemented graphically.

ISSN:0165-0513    

DOI:10.1002/recl.19380571008

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractDans le présent mémoire on trouve les résultats de nouvelles recherches sur la condensation du bromométhyl‐2‐naphtalène. On a constaté que pour cette réaction l'oxyde ferrique est un catalyseur incomparablement plus puissant que la matière des parois de la verrerie (ce Rec. 57, 90), de sorte que l'influence catalytique de celle‐ci est probablement liée à sa teneur en oxyde ferrique. Puis on a décelé la nature du produit de réaction des con

ISSN:0165-0513    

DOI:10.1002/recl.19380571009

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe use of acetaldehyde and oxygen instead of peracetic acid as an oxidising agent. A simple preparation of iodoxybenzene.

ISSN:0165-0513    

DOI:10.1002/recl.19380571010

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractFor the correct appreciation of the extinguishing action, which a gas or vapour exerts on explosive binary gas mixtures, it is necessary to determine the whole ternary explosion region.

ISSN:0165-0513    

DOI:10.1002/recl.19380571011

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY