摘要:

AbstractThis communication describes the isolation of new pigments fromPhyllosticta caryaePeck. One of these pigments, phycaron, is identified as 1,2‐diaceto‐5,10‐dihydroxy‐3,6,9,12 (or 6,7,8,9)‐tetramethoxy‐1,2‐dihydrobenzperylene

ISSN:0165-0513    

DOI:10.1002/recl.19630820402

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19630820403

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe nonionic detergent Nonidet P 40 as made from iso‐octylphenol and ethylene oxide is a mixture of polymers with a divergent ethylene oxide content. It is possible to separate it into components with differing ethylene oxide contents by foam‐fractionation.A solution of a nonionic detergent like Nonidet P 40 in water separates into two phases when the temperature is raised. This cloud point is a measure of the ethylene oxide content of the soap. Use is made of this fact in the analysis of the foam‐frac

ISSN:0165-0513    

DOI:10.1002/recl.19630820404

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractEthanethiolesters can be converted into free acids by:a.treatment with a mixture of mercuric chloride and mercuric oxide in aqueous acetone (table I),b.treatment with benzaldehyde and boron trifluoride in chloroform (table II). The latter procedure probably involves the reactions (1)‐(4

ISSN:0165-0513    

DOI:10.1002/recl.19630820405

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractIt was already known that monoacylglycols can be obtained readily and in very good yields by boiling a solution of the corresponding acylglycol‐iodohydrin and an appropriate silver salt (nitrite or nitrate) in a mixture of ethanol and water. We have now found that mercury(II) salts and palladium(II) salts are equally suitable for this purpose. When salts were used of a great many other metals, distributed as widely as possible over the whole periodic table, under identical experimental conditions the reaction did not take place, or at least not to an extent that could be clearly demonstrated by us. A discussion is devoted to these fact

ISSN:0165-0513    

DOI:10.1002/recl.19630820406

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractIf one molar equivalent of 2‐methyl‐, 2‐ethyl‐ or 2‐n‐propyl‐1,3‐dioxolane is used for the preparation of Grignard‐reagents in benzene, the five‐membered hetero‐ring is opened with formation of a magnesium halide 2‐alkoxyethan‐1‐olate.The steric and electronic effects of the alkyl groups of the Grignard‐reagent and those of the dio

ISSN:0165-0513    

DOI:10.1002/recl.19630820407

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe validity of a superimposability principle for the electronic spectra of disubstituted benzene derivatives, proposed byDoubandVandenbelt5to interpret the principal absorption bands of some trisubstituted benzene derivatives is discussed forp‐aminosalicylic acid, β‐resorcylic acid and 2‐amino‐5‐chlorobe

ISSN:0165-0513    

DOI:10.1002/recl.19630820408

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractIt is shown that the anhydride, the amide, and the esters of 3,5‐dinitrobenzoic acid all give highly coloured π‐complexes with a variety of polycyclic aromatic and heterocyclic compounds. The complexes derived from the anhydride contain one molecule of the anhydride to two molecules of the electron‐donor, whilst the others are of the 1 :

ISSN:0165-0513    

DOI:10.1002/recl.19630820409

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe effect of structure on the rates of hydration was analyzed with the Taft equation log k = ϱ*σ* + constant, for the following two series:(a)HCCSR′, with R′ = C2H5, CH(CH3)2>and C(CH3)3, log kR′ = −0.73σR′* −0.75;(b)RC  CSC2H5, with R = CH3, C2H5, CH2CH2CH3>and CH(CH3)2, log kR= −3.76σR* −2.07.The values of the polar reaction constants are in agreement with the established mechanism of this reaction.The kinetic experiments with HCCSC2H5and DCCSC2H5revealed an inverse secondary deuterium isotope effect: kD/kH= 1.03. This value, was compared with those calculated either from the alterations of the vibrations during the reaction or from the difference in

ISSN:0165-0513    

DOI:10.1002/recl.19630820410

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractAdditional evidence for the occurrence of a rate determining proton transfer in the hydration of 1‐alkynyl ethers is afforded by the value of the solvent deuterium isotope effect, k H 2O/k D 2O= 1.7.The addition of water to 1‐ethoxy‐1‐propyne was investigated in a series of alcohol‐water mixtures. Application of the criterium ofGrunwaldindicates that a solvent molecule is not bound covalently in the slow pro

ISSN:0165-0513    

DOI:10.1002/recl.19630820411

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY