摘要:

AbstractSeveral 1,2‐cyclopentano‐2,5‐dimethyldecalone‐6‐propionic acid‐5 derivatives have been prepared by ozonization of ▵4‐3‐ketosteroids, followed by reduction with sodium and ethanol, yielding hydroxycarboxylic acids. In neutral or acid solution ring closure occurs to the lactones. The resulting 4‐oxa‐3‐ketosteroids probably have the cholestane configuration. This group of substances crystallize readily from the

ISSN:0165-0513    

DOI:10.1002/recl.19510701102

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractIn this paper, the investigations on the relations of structure to antifungal activity of sulphur compounds described in the previous publication of this series are extended to bisdithiocarbamates and isothiocyanates. The most active sulphur fungicide described in the literature so far, disodium ethylenebisdithiocarbamate, is surpassed by a new fungicide mentioned below,viz.ethylene diisothiocyanate. It is suggested that the antifungal action of bisdithiocarbamates is primarily attributable to the formationin situof the corresponding diisothiocyanates.

ISSN:0165-0513    

DOI:10.1002/recl.19510701103

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractWhen 2 mol. of phenyllithium are allowed to react with 1 mol. of lutidine and the mixture is then treated with an excess of benzyl chloride, α‐methyl‐α′‐(dibenzyl‐methyl) pyridine (I) is produced along with α‐methyl‐α′‐phenylethylpyridine (VI). The statement ofBergmannandRosenthal, that α,α′‐bis‐(phenylethyl)pyridine (II) should be produced in this reaction, is incorrect.When 2 mols. of phenyllithium are allowed to react with 1 mol, of lutidine and the product is treated with an exces of benzoic anhydride, a derivative of lutidine is produced, which, contrary to the opinion ofKloppenburgandWibaut, is to be considered as the benzoate of the enol form of 2‐phenacyl‐6‐methylpyridine (VIIb).(VIII). By the interaction of 2 mols. of phenyllithium and 2 mols. ofThe action of 1 mol. of phenyllithium and 1 mol. of benzonitrile on 1 mol. of α,α′‐lutidine leads to the formation of 6‐methyl‐2‐phenacylpyridine (VIII). By the interaction of 2 mols of phenyllithium and 2 mols of benzonitrile on 1 mol. of α,α′‐lutidine, a complicated reaction takes place with the formation of a compound C21H

ISSN:0165-0513    

DOI:10.1002/recl.19510701104

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe structure of the dihydronicotyrine obtained by zinc‐hydrochloric acid reduction of 3,2′‐nicotyrine (I) has for some time been established by chemical means as N‐methyl‐myosmine (II). Recently spectroscopic and chemical evidence has been published which is contrary to this opinion.These spectroscopic findings have been confirmed and extended by the inclusion of 3‐allyl‐pyridine in this investigation.Oxidative degradation of dihydronicotyrine hydrochloride with ozone gave nicotinic acid hydrochloride in approximately 85% yield. This is in accordance with the structure of N‐methyl‐myosmine (II), if a “normal” degradation is assumed. In view of other investigations on “abnormal fission” of double bonds with ozone, we are inclined to regard this evidence as inconclusive.Therefore structuresIIIandIVhave to be considered as representing dihydronicotyrine, and from theseIIIseems most probable.A new and convenient synthesis of (pyridyl

ISSN:0165-0513    

DOI:10.1002/recl.19510701105

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractIt was shown that the electrokinetic behaviour (especially the isoelectric pH value) of Al‐hydroxides depends very strongly on their mode of origin. There is a close connection with the dehydration temperatures, with phosphate‐adsorption and with the results of Röntgenographic anal

ISSN:0165-0513    

DOI:10.1002/recl.19510701106

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractBis‐(pyridyl‐2) ketone has been synthesised by treating 2‐iodopyridine with magnesium in the presence of ethyl bromide and reacting the 2‐pyridylmagnesium iodide complex so obtained with ethyl picolinate. Ethyl‐bis‐(pyridyl‐2)‐carbinol and tris‐(pyridyl‐2)‐carbinol were

ISSN:0165-0513    

DOI:10.1002/recl.19510701107

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractA description is given of the apparatus used for the kinetic measurements on ozonisation reactions described in part II1).A constant stream of a mixture of ozone and oxygen of variable but constant (within 3‰) composition is electrolytically generated by a stabilized generating device.A thermostat suitable for temperatures between 0° and −70° C, varying within 0.04° C, is described.The solubility of ozone in chloroform has been dete

ISSN:0165-0513    

DOI:10.1002/recl.19510701108

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe velocity of the ozonisation of benzene in chloroform is proportional to the concentration of benzene and that of ozone. The reaction constant was determined at eight temperatures between −25 and −40° C.The reaction takes place about three times more rapidly in nitromethane than in chloroform.Aluminium chloride and ferric chloride catalyse the reaction; the velocity increases directly with the concentration of aluminium chloride.The results of our measurements are in agreement with the reaction mechanism suggested in a previous publica

ISSN:0165-0513    

DOI:10.1002/recl.19510701109

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractSome improvements in the design of the previously described electrolytic ozone generator are described. These make the apparatus easier to construct and to handle; in addition, the ozone percentage and production are increased, amounting to 15½ % by weight and 14½ mmols/hr at 15 A, and to 15% by weight and 17 mmols/hr., respectively, at 18 A.By stabilization of the electrolyzing current the apparatus has been shown to be highly satisfactory for quantitative purposes. A stabilizer is described by which the composition of the ozone‐oxygen mixture can be kept constant within a few units per mille for several hours.An apparatus capable of producing smaller amounts of high‐percentage ozone, for use at low current strength, without the need of internally cooling the anode, is also desc

ISSN:0165-0513    

DOI:10.1002/recl.19510701110

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19510701101

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY