摘要:

AbstractIl est montré que les quinones halogénées telles que la chloranile et surtout la 2,3‐dichloro‐1,4‐naphtoquinone peuvent être utilisées avantageusement pour caractériser les amines primaires et secondaires. De nombreuses aminoquinones nouvelles ont été préparées à cette fin, et certaines d'entre elles ont en outre un interét soit au point de vue biologique, soit au point

ISSN:0165-0513    

DOI:10.1002/recl.19520711102

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractLe chlorure trichlorométhanesulfénique réagit aisément sur les thioalcools et thiophénols en produisant avec un bon rendement des esters trichlorométhanesulféniques (alcoyl‐ et aryl‐trichlorométhyl‐disulfures). Sauf quelques esters aromatiques cristallisés, ces produits sont des

ISSN:0165-0513    

DOI:10.1002/recl.19520711103

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractLa réaction de CCl3SCl sur un mercaptide aliphatique donne naissance a un hexa‐alcoylthio‐diméthyldisulfure et à un dialcoyldisulfure simple.La réaction sur un thiophénolate produit, outre un disulfure, un hexa‐arylthio‐diméthyl‐tri‐sulfure. L'oxydation de ces derniers composés conduit à des esters de l'acide t

ISSN:0165-0513    

DOI:10.1002/recl.19520711104

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractLe chlorure trichlorométhanesulfénique CCl3SCl réagit aisément sur les sulfinates de sodium en donnant naissance à des thiolsulfonates de trichlorométhyle: RSO2SCCl3. Plusieurs composés décrits dans nos trois mémoires présentent des propriétés

ISSN:0165-0513    

DOI:10.1002/recl.19520711105

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe preparation of 2‐ethoxy‐4‐diethylaminobenzene‐1‐diazoniumborofluoride is described. A stable diacetyl derivative is formed by treating 2‐ethoxy‐4‐diethylamino‐1‐aminobenzene wi

ISSN:0165-0513    

DOI:10.1002/recl.19520711106

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractA theoretical discussion has been given of the linear relation between the half‐wave reduction potential ε1/2 of aromatic hydrocarbons and the root a of the zero order molecular orbital secular equation corresponding to the lowest non‐occupied π‐electronic level of the molecule, which can be represented by the formula:\documentclass{article}\pagestyle{empty}\begin{document}$$ \varepsilon _{1/2} = {\rm a}\gamma - 1.05\,{\rm volt}. $$\end{document}The magnitude of the zero order “exchange” parameter γ = −2.25 ± 0.07 e.v. has been obtained by substituting the reduction potentials of some aromatic compounds in the given formula.The course of the reduction process can be qualitatively predicted by considering the π‐electronic distribution in the intermediate molecule ion and radical ion, the probability for the addition of the proton being largest at the carbon atom with the highe

ISSN:0165-0513    

DOI:10.1002/recl.19520711107

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe solvation of iodine in dioxan‐carbon tetrachloride and dioxan‐n‐hexane solutions was studied by measuring the absorption spectra at different concentrations and temperatures. The concentration of the iodine‐dioxan complex is derived both from the extinction at about 4525 Å and at 2650 Å. The equilibrium constants thus derived from two independent series of measurements were found to correspond within the limits of accuracy, thus proving that both the absorption in the visible and in the ultraviolet part has to be ascribed to the same iodine‐dioxan complex 1:1.The equilibrium constant Kxat 25° C was found to be 9.1 and 9.3 for carbon tetrachloride andn‐hexane solutions respectively. From the dependance on temperature the heat of formation was found to be 3300 ± 200 cal/mole and 3500° 200 cal/m

ISSN:0165-0513    

DOI:10.1002/recl.19520711108

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe reaction of thiols (R'SH) with 2‐cyano‐2‐propyl radicals (R), generated by thermal decomposition of 2,2′‐azoisobutyronitrile (RN = NR), was investigated.The radicals (R) readily abstract a hydrogen atom from the thiol (R'SH), producing isobutyronitrile (RH) and thiyl radicals (R'S), whilst their dimerisation product, tetramethylsuccinonitrile (RR), is also formed in appreciable quantities. Using primary, secondary and tertiary thiols respectively, decreasing yields of isobutyronitrile (RH) and increasing yields of tetramethylsuccinonitrile (RR) were obtained. This indicates that the reactivity of thiols towards R decreases in the same order. There appeared to be little difference between toluene‐α‐thiol and n‐octane‐1‐thiol.The thiyl radicals (R'S) combine to form disulphide (R'SSR') and with 2‐cyano‐2‐propyl radicals (R), to form mixed sulphides (R'SR). The latter are formed in far lower yields than both the disulphides and tetramethylsuccinonitrile. This phenomenon may be related to the fact that the CS bond is weaker than could be expected fr

ISSN:0165-0513    

DOI:10.1002/recl.19520711109

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe addition of ozone to 3‐methylpyridine, 2,6‐dimethylpyridine, and 2,4,6‐trimethylpyridine was studied quantitatively. After hydrolysis of the reaction products, the quantity of ammonia formed was measured. The results show that in all the cases investigated the action of ozone leads to the formation of a diozonide; no indication of the addition of ozone to the CN bond was found with any of these compounds.Further the velocity was measured of the ozone addition to the abovementioned compounds, and also to pyridine, 2‐ and 4‐methylpyridine, and 4‐ethylpyridine. The reaction velocity is smaller than that of the corresponding benzene derivatives. Introduction of methyl groups into the pyridine nucleus enhances the reactivity with re

ISSN:0165-0513    

DOI:10.1002/recl.19520711110

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractIt is shown that formaldehyde undergoes an acid catalyzed Cannizarro reaction in an acetic‐sulphuric acid medium as well as in an aqueous solution of sulphuric acid.In an acetic‐sulphuric acid medium the reaction slows down when the sulphuric acid content is increased above a certain maximum.In the same medium acetaldehyde is hydroxymethylated by formaldehyde a reaction which is followed by a crossed Cannirarro leading to esters of pentaerythritol and to its diformal compound (2,4,8,10‐tetraoxa‐6‐spiro‐undecane) which is easily prepared from the components in acid solution.These reactions explain the formation of 2‐methyl‐2‐hydroxymethyl triacetateS. Olsen, Z. Naturforschung1, 676 (1946); Chem. Abstr.44, 1130 (1950);J. W. Baker, J. Chem. Soc.1948, 89.in the condensation between ethene

ISSN:0165-0513    

DOI:10.1002/recl.19520711111

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY