Übergangsmetall—carbin-komplexe

Preparation of heterodinuclear complexes containing .mu.-alkylidene ligands

“…A significant structural feature is the C(40)-N(l) bond distance of 1.40 (4) Á. This value is very similar to the corresponding C-N distances of 1.392 (6) Á observed in the T)2-dimethyliminium complex Ni(?/2-H2C=NMe2)-(PPh3)(Cl)12 and of 1.43 (2) Á observed in an rp-Nmethylsalicylaldiminium ligand in a mononuclear nickel complex.13 Within the determined precision limitations, (11) Jeffery, J. C.; Moore, I.; Stone, F. G. A. J. Chem. Soc., Dalton Trans.…”

trans‐Bromo(diethylaminocarbyne)tetracarbonylchromium

“…The trans arrangement of the ligands CN(C2Hs)2 and Br in the pseudooctahedral chromium complex (2) has been confirmed by an X-ray (Fig. 1).…”

“…In spite ofthis rule we have been able to prepare tetraisopropylchromium (2) by reaction of chromium (lr1) …”

“…In order to elucidate the influence of a hetero atom having a lone pair located in CI position relative to the carbyne carbon atom of the CR ligand, on the triple bond transition metalCcarbyne we have synthesized trans-bromo(diethy1aminocar-byne)tetracarbonylchromium (2). In contrast to transBrW(CO),[CN(C *H s)2] reaction according to .N( C zHd 2 OCZH, (CO) jcr-c'c…”

Übergangsmetall-Carben-Komplexe, CXXXIV [1]. Synthese neuer Mono- und Biscarben-Komplexe der VI. Nebengruppe; Röntgenstruktur des ersten Bis[amino(alkoxy)carben]-Komplexes / Transition Metal Carbene Complexes, CXXXIV [1]. Synthesis of New Mono- and Bis-Carbene Complexes of Group VIb Elements; Structure of the First Bis[amino(alkoxy)carbene]-Complex

“…0 3 4 0 -5 0 8 7 /8 4 /0 5 0 0 -0 6 6 8 /$ 01.00/0Präparative Ergebnisse Setzt man Lithiumdiisopropylamid in der beim Lithium diethylam id gew ohnten Weise[9] mit der äqui valenten Menge an Hexacarbonylwolfram in THF um, so erhält man nach der anschließenden Alkylie rung mit Triethyloxonium salz ungewöhnlich kom ple xe Spektren der R eaktionsprodukte. Erst nach auf wendiger chrom atographischer Trennung lassen sich zwei verschiedene Produkte nachweisen, der erw ar tete M onocarben-K om plex (CO )5W [C(N'Pr2)OEt] (1) und die neuartige Biscarben-Verbindung cis-…”