Ueber den Brechungsindex einiger Körper in Gelatine

Ohne Zusammenfassung     

Formung von Gelen durch Kristalle

Ohne Zusammenfassung     

Ein kolloider Wärme-Indikator

Zusammenfassung Zur Aufdeckung der ?rtlichen W?rmeverteilungen in den nach J. Uri-Lloyd geb?nderten Flüssigkeiten lassen sich die Trübungen benutzen, welche gewisse Alkaloide infolge der Alkalit?tszunahme einer Sulfitl?sung beim Erw?rmen annehmen.     

Die Gestalt einiger Silikatniederschläge

Ohne ZusammenfassungNeurologisches Institut, Frankfurt a. M., Dir. Prof. L. Edinger.     

Relations entre le second coefficient du viriel A2 et la masse moleculaire,dans le systeme polystyrene-benzene

We present results obtained by osmometry on the polystyrene-benzene system at 24°C as a function of the polymer molecular weight. The variation of the second virial coefficient, as predicted by the Flory-Krigbaum theory of dilute solutions is lower than that obtained by our osmotic measurements: this difference is discussed. Using the Kurata method, we determined the unperturbed dimensions of the macromolecule. Lastly, we established the equation for the variation of the mean square distance with molecular weight for the polystyrene-benzene system.     

Reactions of cannabinoid tosylhydrazones: Stereochemical aspects

Reactions of the epimeric 7-oxo-hexahydrocannabinol tosylhydrazone acetates (2a and4a) are described. Under aprotic basic reaction conditions followed by acetylation both compounds lead to the known Δ1⁷-tetrahydrocannabinol acetate (6); under protic conditions the axial isomer undergoes ring expansion (to7b), the equatorial one gives6.     

Use of 13C isotope shifts for assignment of deuterium labelling sites in 1,3-diphenylpropan-1-one

¹³C NMR spectroscopy was used for the unequivocal analysis of the mixture of products of RuCl₂[P(C₆H₅)₃]₃-catalysed transfer deuteriation of benzylideneacetophenone by (a) DCOONa/H₂O, (b) HCOONa/D₂O and (c) DCOONa/D₂O. Signal assignments in the ¹³C spectra were obtained mainly from the deuterium-induced ¹³C isotope shifts. The geminal ¹³C? ²H shift of the β-carbon of deuteriated 1,3-diphenylpropan-1-one is almost twice that for the α-carbon.