摘要:

AbstractThe 8α, 10α‐isomers of progesterone and of testosterone have been prepared using pyrocalciferol as the starting mater

ISSN:0165-0513    

DOI:10.1002/recl.19610801002

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractA new and simple method is described for the preparation of symmetrically and asymmetrically substituted diaryl sulphides from sodium thiophenolates and halogenated aromatics by heating in a suitable solvent, preferably dimethylformamide. Formation of poly‐substituted products may be suppressed by using an excess of the halogenated aromatic hydrocarbo

ISSN:0165-0513    

DOI:10.1002/recl.19610801003

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe preparation of some aryl‐pyridyl sulphides with potential acaricidal properties is described. In the compounds synthesized the benzene nucleus is substituted with apara‐chlorine atom or with three chlorine atoms in positions 2, 4 and 5. Position 5 in the pyridine nucleus is either unsubstituted or carries a chlorine substituent. From a few aryl‐pyridyl sulphides the corresponding N‐oxides have been p

ISSN:0165-0513    

DOI:10.1002/recl.19610801004

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractFour new methods are described for synthesizing 2,6‐dichlorobenzonitril

ISSN:0165-0513    

DOI:10.1002/recl.19610801005

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe reactions between a number of orthophosphates, especially silver orthophosphate, and acid chlorides are described as well as a synthesis and the properties of tribenzoyl phosphate. Nucleophilic aromatic ring systems are acylated by triacyl phosphates.

ISSN:0165-0513    

DOI:10.1002/recl.19610801006

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe plant growth‐regulating activity on tomato plants of S‐carboxymethyl‐N,N‐dimethyldithiocarbamate and of structurally related compounds has been investigated. Activity is connected with the electronic configuration of the molecules,viz.with a distinct degree of double‐bond character of the NC bond. In addition, however, sterical factors seem to be of decisive significance for presence or absence of growth‐regula

ISSN:0165-0513    

DOI:10.1002/recl.19610801007

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe syntheses are described of previtamin D ‐ and vitamin D analogues to be used for the study of the thermal precalciferol ⇋ calciferol isomerization reaction.A previtamin D analogue (4) prepared as indicated by Inhoffen could not be obtained in a pure state. Closer inspection revealed that the final step, the selective partial hydrogenation of the triple bond of 3, yielded a mixture of isomers. Two calciferol analogues (15A and 15B) were synthesized, following routes used by Harrison and Lythgoe for obtaining related compounds. These vitamin D analogues showed the same remarkable smooth isomerization as the vitamin itself. With the analogues, however, the equilibrium was found to be displaced towards the “previtamin” side. This enabled us to obtain the corresponding previtamin D analogues by heating the acetates of the calciferol analogues (15) at 90°, followed by saponification and chromatographic puri

ISSN:0165-0513    

DOI:10.1002/recl.19610801008

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe facile acid‐catalysed dehydration of substituted β‐ionols, e.g. β‐C15‐ and β‐C20‐hydroxy esters, gives a substantial yield of the R (= retro) compounds and not of the corresponding β‐ionylidene compounds. This is correlated with the different properties of these molecules: almost planar configuration of R‐compounds vs. distorted β‐

ISSN:0165-0513    

DOI:10.1002/recl.19610801009

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe brown precipitate obtained at 80°C, and the purple precipitate prepared at 170°C from AlEt3and TiCl4at an Al/Ti ratio 1/3, both consist essentially of TiCl3in which about one sixth of the Ti is replaced by Al and a few percent of the chlorine by ethyl. The brown precipitate gives the X‐ray diagram of β‐TiCl3, whereas the purple one gives that of γ‐TiCl3.Magnetic measurements showed that already at ambient temperature precipitates of the β‐TiCl3structure gradually change into products with the γ‐TiCl3structure.On treating the brown precipitates with AlEt3they change into nearly amorphous black products with an atom ratio of chlorine to (Al + Ti) considerably lower than two. The composition and structure of the purple precipitates are much less affected by this treatment, the effect of AlEt3being stronger than that of AlEt2Cl.It seems that the catalyst systems so obtained only polymerize propene to a highly isotactic polymer if the crystalline substrate is not more than slightly converted

ISSN:0165-0513    

DOI:10.1002/recl.19610801010

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractFor measuring the solubility of a gas in a liquid at about atmospheric pressure a modified stripping method was developed. It was tested by measuring the solubility of hydrogen in benzene. With this method we measured the solubility of hydrogen in cyclohexane, decalin, phenol and cyclohexanol at various temperatures. We also determined the solubility of hydrogen in benzene‐cyclohexane mixtures. Within the accuracy of the experiment the solubility in the mixtures was found to be a linear function of the composition.From the rate of expulsion it was found that under the conditions of the stripping experiments the solubility equilibrium was not established and that the mass transfer between the liquid and the gas was rate determinin

ISSN:0165-0513    

DOI:10.1002/recl.19610801011

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY