Browsing by Author "Dartmann, Mechtild"

Now showing 1 - 3 of 3

Open Access
Metallophospha-alkenes: a simple access and some reactivities involving the phosphorus atom
(1985) Gudat, Dietrich; Niecke, Edgar; Malisch, Wolfgang; Hofmockel, Ullrich; Quashie, Sapé; Cowley, Alan H.; Arif, Atta M.; Krebs, Bernt; Dartmann, Mechtild
The synthesis and studies on the reactive behaviour of metallophospha-alkenes are reported.
Open Access
Pentamethylcyclopentadienyl[bis(trimethylsilyl)methylen]phosphan - ein Phosphaalken mit einer reaktiven PC-Einfachbindung
(1985) Gudat, Dietrich; Niecke, Edgar; Krebs, Bernt; Dartmann, Mechtild
Synthesis, spectroscopic data and X-ray structure determination of a novel phosphaalkene, Me5C5-P=C(SiMe3)2 1, are reported. It is shown by dynamic 1H-NMR spectroscopy that 1 exhibits thermal E/Z-isomerization of the double bond at ambient temperature. Reactions of 1 involve electrophilic attack of the π-system with hard (H+) and soft (Ag+) Lewis-acids, and an unusual cleavage of a PC-single bond on reaction with metal complexes (MeCN)3M(CO)3, (M = Mo, W).
Open Access
Reaction of (pentamethylcyclopentadienyl)(tert-butylimino)-phosphane with tris(acetonitrile)tricarbonylmolybdenum(0): evidence for a metalloiminophosphane intermediate
(1986) Gudat, Dietrich; Niecke, Edgar; Krebs, Bernt; Dartmann, Mechtild
(η1-Me5C5)P=N(t-Bu) (1) was prepared in a two-step synthesis from Me5C5PCl2. Reaction of 1 with (MeCN)3Mo(CO)3 affords the spirocyclic compound (η1-Me5C5PN(t-Bu)PN(T-Bu)C(O)Mo(CO)2(η5-C5Me5) (5), whose structure was determined by x-ray crystallography. A metalloiminophosphine, (η5-Me5C5)(CO)3MoP=N(t-Bu) (7), is proposed to be the key intermediate in the formation of 5.