摘要:

AbstractContrary to the results of earlier investigators it is found that the reaction of chlorine with quinone is a cis‐addition. Conditions are studied for the conversion of cis‐quinonedichloride into the trans‐isomer and subsequently into 2,3‐dichloroquinol.The course of the reaction between sulphuryl chloride and quinol is elu

ISSN:0165-0513    

DOI:10.1002/recl.19540730102

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

Abstract4‐Nitro‐2,6‐xylidine (4‐nitro‐2,6‐dimethylaniline) has been obtained by the interaction of ammonia and 4‐nitro‐2,6‐xylenol (4‐nitro‐2,6‐dimethylphenol), an eas

ISSN:0165-0513    

DOI:10.1002/recl.19540730103

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractFor the interpretation of potentials of plant roots in electrolyte solutions it is desirable to know the variations with pH of net charge on the non‐permeating material inside the root wall. Since this is a very complex mixture, it is proposed to use as a model a solution characterized by a continuous range of titration constant

ISSN:0165-0513    

DOI:10.1002/recl.19540730104

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractAt 10−4‐ 10−2mol/l a number of sulphonic acids and related compounds, especially indole (3) methane‐sulphonic acid and 2,3,6‐trichlorophenylmethanesulphonic acid were found to be active as growth substances in the pea test, Avena straight growth test and flax root test. These acids being completely dissociated at physiological pH values, the anion must be the active form.The relatively low structural specificity of the polar group in the side chain of active compounds is considered to be indicative for a physicochemical type

ISSN:0165-0513    

DOI:10.1002/recl.19540730105

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractIn a paper entitled “The configuration of 2,2′Dipyridil”FieldingandLe Fèvre) point out some errors occurring in a publication) by one of the present authors (G), entitled: “Electric Moments of Pyridine Derivatives”. These errors, which the British authors kindly consider to be “probably clerical errors”, are very annoying, so that we think it useful to corre

ISSN:0165-0513    

DOI:10.1002/recl.19540730106

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractNo exchange was observed whensym.trinitrobenzene was dissolved in a solution of NaOH containing heavy water.

ISSN:0165-0513    

DOI:10.1002/recl.19540730107

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractThe phenomenon mentioned in an earlier paper,viz.that a methyl group inortho‐xylene derivatives may behave as a larger substituent than the methyl group in comparablepara‐xylene or toluene derivatives, has been investigated more in detail with the aid of deacylation rates, ultra‐violet absorption spectra, molecular refractions, and basic strengths. The phenomenonper sehas been confirmed by this work. Naturally, however, it does not always manifest itself to the same degree; various factors play their part in this respect.On the strength of the data collected, the order of steric effects of methyl (ene) groups found byArnoldand co‐workers has to be modified as follows: CH2(in o‐xylyl)>CH2(in a 6‐membered ring)>CH2(in tolyl)>CH2(in a 5‐m

ISSN:0165-0513    

DOI:10.1002/recl.19540730108

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractThe deacylation rate constants of the compounds mentioned in the title provide corroborative evidence for the existence of the “ortho‐xylene effe

ISSN:0165-0513    

DOI:10.1002/recl.19540730109

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

Abstractn‐Aliphatic aldehydes andn‐methyl ketones up to and including C18are separated by partition chromatography of the 2,4‐dinitrophenylhydrazones on silica‐gel with light petroleum as mobile and nitromethane as immobile phase. Identification is possible by means of the retention

ISSN:0165-0513    

DOI:10.1002/recl.19540730110

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractWith the aid of 4‐dialkylamino‐3,5‐dinitrobenzoyl chloride primary normal aliphatic alcohols and normal methyl‐carbinols up to ca. C14are practically quantitatively converted into coloured esters, which can be separated by partition chromatography. Identification is possible by means of the retention volumes, while a quantitative determination can be made by measuring the UV absorption.The theory of partition chromatography is extended and it is shown that the logarithms of the true retention volumes for terms of a homologous series plotted against the number of C‐atoms must give a straight line, provided the behaviour of the solutions and chromatographic system is ideal. The slope of this line is determined exclusively by the partition system and the nature of the homologous series. The significance of this relationship for the identification of homologues is

ISSN:0165-0513    

DOI:10.1002/recl.19540730111

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY