摘要:

AbstractAn analytical method is given for determining the distribution of cation valencies in MntFe3‐tO4for o

ISSN:0165-0513    

DOI:10.1002/recl.19640830402

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe presence of substituted side groups on the benzoquinolizinium ion has a measurable effect on the magnitudes of the reduction potentials. Qualitative relationships between inductive and/or resonance effects of these side groups and the corresponding half‐wave potentials are discusse

ISSN:0165-0513    

DOI:10.1002/recl.19640830403

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractSome ethoxyvinyl esters II were prepared by addition of acylamino‐acids to ethoxyethyne (see table I). These products react with amino‐acid or peptide esters to produce peptide esters or with hydrogen chloride to yield acid chlorides.A sensitive reaction for ethoxyvinyl esters consists in treatment with bromine, where lachrymatory products (ethyl bromoacetate and acyl bromide) are formed.The reaction of ethoxyethyne with two moles of acylamino‐acids yields anhydrides of acylamino‐acids (see table II).Expectedly, anhydrides of acylamino‐acids react with aniline to produce anilides and with amino‐acid or peptide esters to produce peptide esters.Anhydrides of benzyloxycarbonylamino‐acids are thermolabile. The decomposition of the anhydride of benzyloxycarbonylglycine has been shown to produce N,N′‐bisbenzyloxycarb

ISSN:0165-0513    

DOI:10.1002/recl.19640830404

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractReduction of 9‐phenanthroic acid with sodium and liquid ammonia results in the formation of 9,10‐dihydrophenanthrene‐9‐carboxylic acid in hig

ISSN:0165-0513    

DOI:10.1002/recl.19640830405

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe reduction of optically active 6‐chloro‐2,6‐dimethyloctane to 2,6‐dimethyloctane by a solution of an alkali metal in liquid ammonia proceeds with predominating retention of configuration. It is concluded that the reaction proceedsviacarbanions. The mechanism of the reaction is discussed.The absolute configuration of (+)‐2.6‐dimethyloctane was determined by synthesis from (S)‐(−)‐

ISSN:0165-0513    

DOI:10.1002/recl.19640830406

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractCurcumin has been prepared in 80% yield from vanillin and acetylacetone/B2O3in the presence of tri‐sec.butyl borate and butylamine. The reaction was carried out in ethyl acetate at room temperature. Eight compounds related to curcumin have also been synthesize

ISSN:0165-0513    

DOI:10.1002/recl.19640830407

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractA simple synthesis of 1,2,3,4,5‐substituted 1,2,4‐triazolidines is gi

ISSN:0165-0513    

DOI:10.1002/recl.19640830408

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe structure of several 2,4,6‐trisubstituted 1,3,5‐trioxans has been studied by N.M.R. and the dipole moment of α‐parabutylchloral has been measured in solution. All compounds were found to be in the chair confor

ISSN:0165-0513    

DOI:10.1002/recl.19640830409

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe formation of the bicyclo[3.3.0]octane ring system by isomerization of perhydronaphthalene and perhydroindane has been studied. Experiments were performed in the liquid phase under the influence of aluminium halides and in the gas phase at 300‐500° in the presence of a silica‐alumina catalyst. In both types of reaction a great number of compounds were formed.From the liquid‐phase reaction product of perhydronaphthalene a hydrocarbon carrying two methyl groups per molecule could be separated by preparative GLC; its structure could not be determined.In the liquid as well as in the gas‐phase experiments with perhydroindane the five isomeric methyl‐cis‐bicyclo[3.3.0]octanes were formed besides a large number of unidentified degradation products.Experiments with the individual isomers revealed that under the conditions of the gas‐phase reactions their stabilities differ considerably; 1‐methyl‐cis‐bicyclo[3.3.0]octane is the most stable, the endo‐2‐methyl derivative

ISSN:0165-0513    

DOI:10.1002/recl.19640830410

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe syntheses of the five methyl‐cis‐bicyclo[3.3.0]octanes are described. The exo‐3 compound could only be obtained as a mixture with an equal amount of its endo‐3

ISSN:0165-0513    

DOI:10.1002/recl.19640830411

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY