摘要:

AbstractThe dipole moments have been determined for eleven 1,3‐dioxolanes, four oxazolidines and two isomeric Schiff's bases, and four imidazolidines. The influence of the molecular structure of the substances on these moments has been discussed. Certain anomalies appear consistently in the physical constants of the heterocyclic compounds, when they are derived from cyclopentanone, methylisobutylketone or diisobutylketone. In order to obtain a better insight into these anomalies, seven more 1,3‐dioxolanes have been synthesized and their molecular refraction and infrared spectrum studied. Furthermore, the condensation of three ketones with ethanolamine and 3‐methyl‐2‐amino‐butanol‐3 has been investigated, and the molecular refraction and infrared absorption of the products determined

ISSN:0165-0513    

DOI:10.1002/recl.19520710302

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractN‐Phenylethanolamine condensed easily with aldehydes to give substituted oxazolidine. No reaction could be achieved with ketones.The molecular refraction and the infrared and ultraviolet spectra of the substances were measured. Critical evaluation of the results shows, that in these compounds the molecular refraction can only be used with great caution as a tool in determining the structure.The infrared spectra have been measured by Dr.S. Pinchas, the ultraviolet spectra by Dr.Y. Hirshberg, both of the Optics Department of this Institut

ISSN:0165-0513    

DOI:10.1002/recl.19520710303

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe preparation of ten N‐methyloxazolidines, their molecular refraction and infrared absorption spectrum are reported. The molecular refractions show a depression which is ascribed to the oxazolidine ring. The infrared absorption spectra consist of a number of bands in the 1050–1190 cm−1region, characteristic of thegroup and the tertiary nit

ISSN:0165-0513    

DOI:10.1002/recl.19520710304

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractDeux problèmes de tautomérie posés par l'étude expérimentale de certains dérivés de condensation de β‐hydroxyamines primaires avec des composés carbonylés sont envisagés à la lumière de la technique réfractométrique. L'étude de la Réfraction Moléculaire (R.M.) à 20° permet de confirmer l'hypothèse de cette tautomérie. La variation thermique de cette R.M. ajoute un argument supplémentaire et permet de prévoir le sens de l'évolution de la tautomérie en fonction de la température. Un mécanisme raisonnable est proposé pour expliquer

ISSN:0165-0513    

DOI:10.1002/recl.19520710305

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractMalgré quelques difficultés rencontrées dans le calcul des susceptibilités magnétiques, les résultats obtenus dans l'étude magnétochimique de plusieurs des substances examinées dans le précédent mémoire (VIII) corroborent pleinement les conclusions de

ISSN:0165-0513    

DOI:10.1002/recl.19520710306

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe heats of combustion, melting points, heats of fusion, boiling points, refractive indices and in four cases the densities have been determined on selected samples of the cyclanes with 4 to 9 C‐atoms; some hitherto unknown transition points were discovered and the heats of transition measured. The heats of vaporisation at 25° are estimated. Results of the measurements are discuss

ISSN:0165-0513    

DOI:10.1002/recl.19520710307

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractWhen tetraglycine methyl ester is heated at 185° C in the solid state or at 100° C dissolved in methanol, polymers containing small amounts of sarcosyl‐units are formed. An induction period occurs only under the first mentioned conditions. Also polymers obtained by heating triglycine methyl ester at 100°–100° C partly consisted of sarcosyl‐units. Some of the phenomena described in this and the preceding part1) are believed to be due to rigidity of the crysta

ISSN:0165-0513    

DOI:10.1002/recl.19520710308

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractDans ce travail, on a étudié sur plusieurs exemples de réduction d'aldéhydes et de cétones, certaines limitations de la réaction deKishner‐Wolff. Il est montré que deux limitations importantes sont dûes, l'une à l'empêchement stérique, l'autre, à la grande mobilité des atomes d'halogènes sur certains composés hétérocycliques ou aromatiques. Une troisième limitation, moins importante, est dûe à la transposition des dérivés nitr

ISSN:0165-0513    

DOI:10.1002/recl.19520710309

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractA short review of earlier work on vaccenic acid is given and a new synthesis is described.

ISSN:0165-0513    

DOI:10.1002/recl.19520710310

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractHammett's substitution constant σ for the methylsulphonyl group has been determined, giving σ‐meta‐CH3SO2= 0.615(0.6522) and two values for σ‐para‐CH3SO2viz. + 1.15 for the substituted phenol and aniline and + 0.73 for the benzoic acid. This indicates that the methylsulphonyl group has a negative mesomeric effect and that its sulphur atom can extend the octet of electrons to a decet

ISSN:0165-0513    

DOI:10.1002/recl.19520710311

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY