Buchbesprechungen

Ohne Zusammenfassung     

Buchbesprechungen

Ohne Zusammenfassung     

Über die Bildung kondensierter Borazinderivate bei der Grignardmethylierung von 2,4,6-Trichlorborazin

Ohne Zusammenfassung     

The alkaloids from the fruits of the plant Daphniphyllaceae

Six alkaloids have been isolated from the fruits of the plant Daphniphyllaceae. Two of them are new alkaloids, namely methyl homodaphniphyllate (1) and daphnilactone-B (2). The structure of the former was deduced by chemical transformation from daphniphylline (3). The structure of daphnilactone-B was estimated by the exhaustive spectral analysis as well as by chemical evidences, and finally determined by an X-ray crystallographic analysis of the free base.     

Darstellung,Schwingungsspektren und Struktur von Oxotetrafluorovanadaten MIVOF4 (MI = Na,K, Rb,Cs, Tl, (CH3)4N)

Preparation, Vibrational Spectra, and Structure of Oxotetrafluorovanadates M^IVOF₄ (M^I = Na, K, Rb, Cs, Tl, (CH₃)₄N) The compounds M^IVOF₄ (M^I = K, Rb, Cs, Tl) and M^IVOF₄ · H₂O (M^I = Na, (CH₃)₄N) have been prepared. The crystal structure of KVOF₄ has been determined by single crystal X-ray diffraction. The VOF-ions form endless chains by fluorine bridges. The lengths of the bridge bonds are 1.875(7) and 2.333(7) Å. The terminal V? O- and V? F-distances are 1.572(8) and 1.793 Å (mean value), respectively. The vibrational spectra have been registered and assigned.