A free tricarbene is most likely a long‐lived intermediate in the formation of the first hexacarbene iron complex 1 (R = Me) from trimethylated tris(1‐imidazolyl)borate, n‐butyllithium, iron chloride, and tetraphenylborate. This tripodal C,C′,C″‐chelating ligand, for which the authors predict a brilliant future, is an isomer of Trofimenko's tris(1‐pyra‐zolyl)borate and represents a novel class of negatively charged six‐electron donors with the greatest possible similarity to the cyclopentadienyl anion.
Rarity value is something that main group complexes of N‐heterocyclic carbenes still have. With a triscarbene chelating carbon analogue of Trofimenko's tris(pyrazolyl)borate the solvent free, dinuclear lithium complex 1 was successfully synthesized, in which the lithium atoms are only bound to carbene carbon atoms.
Über ein freies Triscarben verläuft höchstwahrscheinlich die Synthese des Komplexes 1 (R = Me) aus trimethyliertem Tris(imidazolyl)borat, n‐Butyllithium, Eisenchlorid und Tetraphenylborat. Der tripodale C,C′,C″‐Chelatligand, dem die Autoren eine glänzende Zukunft prophezeien, ist isomer zum Trofimenkoschen Tris(pyrazolyl)borat und repräsentiert eine neue Klasse einfach negativ geladener Sechselektronendonoren mit größtmöglicher Ähnlichkeit zum Cyclopentadienyl‐Liganden.
Two new methods for the formation of CpRe(CO) 3 substituted steroids are presented; both imply a one-pot procedure involving a transmetallation process.
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