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Intramolecular Carbene-Carbon Monoxide Coupling in Chromium and Tungsten Complexes

✍ Scribed by Dr. Helmut Fischer

Publisher: John Wiley and Sons
Year: 1983
Tongue: English
Weight: 257 KB
Volume: 22
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.198308741

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✦ Synopsis

elimination rather than to a lower reactivity of [Ru] towards an sp3-C-H bond. 5d-Metals (such as, e.g.. iridium) form more stable M-H and M-C bonds than 4d-metals (such as, e. g., ruthenium), another finding consistent with the results published recently by Jones and FehedSb1. We assume that a higher charge density at the central atom caused by the ligand in addition to the greater number of electrons of the metal effects stabilization of the M-H and M-C bonds. This hypothesis is supported by the fact that the complex 7 (with the better donor C6Me6 compared to C&), unlike 3, does not react with C6D6 to give (C6Me6)RuD(C6D,)(PMe3) even on prolonged heating at 50°C.

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