摘要:

AbstractN, N‐dialkyl carbamates decompose in strongly acidic media to carbon dioxide, olefin, alkyl halide and alcohol, the rate of reaction of the secondary esters closely following the acidity function. This fact, together with the variation in rate of hydrolysis of carbamates of cyclic alcohols with the ring size, shows that, unlike the solvolyses of the corresponding chloroformates which lead to carboxonium ions (\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm R - O -}\mathop {\rm C}\limits^{{\rm (+)}} = {\rm O} $\end{document}), these reactions involve the intermediate formation of carbonium ion

ISSN:0018-019X    

DOI:10.1002/hlca.19670500402

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractFrom the stem bark ofAlstonia macrophyllaWall. a new quaternary alkaloid macrosalhine, C21H27O2N 2+, has been isolated in small amounts as chloride or thiocyanate. On the basis of its chemical transformations and particularly its spectral properties (NMR., mass) the structure1has been proposed for it. Macrosalhin therefore represents a new skeletal type in the alkaloid fiel

ISSN:0018-019X    

DOI:10.1002/hlca.19670500403

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractThe chemically elucidated structure of Macrosalhine, an alkaloid ofAlstonia macrophyllaWall., has been confirmed by X‐ray analysis, the remaining relative stereochemical questions having been at the same time resolve

ISSN:0018-019X    

DOI:10.1002/hlca.19670500404

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractThe total vapor pressures and the heats of mixing of the system cyclohexane‐diethyl ether were measured at 25°C. The index of refraction was used to determine concentrations for the total pressure measurements. The partial pressures, activity coefficients, excess free energies, and entropy functions were calculat

ISSN:0018-019X    

DOI:10.1002/hlca.19670500405

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

Abstract(Alkoxycarbonyl‐chloroacetyl‐methylene)‐phosphoranes dealkylate in the presence of acids and give the very stable lactone‐betaine IV. The mechanism of this reaction is tentatively compared to other known dealkylations catalysed by protons or quaternary phosphonium co

ISSN:0018-019X    

DOI:10.1002/hlca.19670500406

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractIn acetic acid, trimethyl phosphite dealkylates and simultaneously forms dimethyl (1‐dimethoxyphosphono‐ethyl) phosphate. This is interpreted as evidence of an attack at the carbonyl group of the carboxylic a

ISSN:0018-019X    

DOI:10.1002/hlca.19670500407

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractOn a isolé sous forme de son sel di‐ammonique cristallisé, un complexeépi‐inositol dimolybdique, qui a été transformé en son sel disodique C6H8O11Mo2Na2. On a préparé de même le sel disodique C6H8O11W2Na2d'un complexeépi‐inositol ditungstique. Les poids moléculaires ont été confirmés par cryoscopie dans le sel de Glauber. Ces complexes présentent une forte mobilité électrophorétique. Il en est de même d'autres cyclitols susceptibles de contenir un groupement de 4 OHcisde conformation 1a, 2e, 3a, 5a, qui se condenserait avec les acides dimolybdique et ditungstique. Cette structure a été confirmée par le spectre de RMN. du comple

ISSN:0018-019X    

DOI:10.1002/hlca.19670500408

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractFor the first time pentacyclic azo dyestuff chromium(III) and cobalt(III) complexes with Drew‐Pfitzner configuration have been produced. Comparison of their electronic spectra with those of analogous 1:2 complexes enables novel conclusions as to the shape of the octahedron formed by the metal‐binding at

ISSN:0018-019X    

DOI:10.1002/hlca.19670500409

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractNaphtalin‐chromtricarbonyl kristallisiert in 2 Modifikationen: (a) als Schindeln mita=12,37,b=6,58,c=7,36 Å, α=107°22′, β=96°44′, γ=92°50′,P1 oder P\documentclass{article}\pagestyle{empty}\begin{document}$ \mathop 1\limits^ - $\end{document},Z=2, und (b) als Nadeln mita=13,98,b=11,71,c=6,87 α,P212121,Z=4. Von letzterer wurde mittels einer 3d‐Patterson‐Synthese, gefolgt von mehreren 3d‐Fourier‐und ‐Differenz‐Fourier‐Synthesen und Kleinste‐Quadrate‐Verfeinerungen die vollständige Struktur bestimmt (R=8,5%). Die C‐C‐Abstände im ebenen Naphtalinring von 1,375‐1,447α weisen gegenüber denjenigen im Naphtalin selber (1,364‐1,427Å) keine wesentliche, durch den Cr(CO)3‐Komplex bedingte Auflockerung auf. Keine Carbonylgruppe liegt in der «langen» Spiegelebene der Naphtalinmolekel, sondern jede ist aus ihr herausgedreht. Die zwischenmolekularen Abstände von 3,34‐3,71 Å f

ISSN:0018-019X    

DOI:10.1002/hlca.19670500410

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractThe following heats of mixing have been measured: the five isomers of hexane withn‐dodecane at 10°, 20° and 30°C, and withn‐hexadecane at 20°C, as well as the systems dodecane‐hexene‐1 at 20°C, and dodecane‐methyl‐2‐pentene‐1

ISSN:0018-019X    

DOI:10.1002/hlca.19670500411

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY