By Klaus Theopold
This quantity experiences the training, houses, reactions and specific functions of crew five to 7 organometallic compounds. each one bankruptcy examines the compounds shaped among Vanadium, Niobium, Tantalum, Chromium, Molybdenum, Tungsten, Manganese, Technetium and Rhenium and particular ligands. It offers a transparent and entire evaluation of advancements due to the fact that 1993 and makes an attempt to foretell developments within the box over the following ten years. Like its predecessors, COMC (1982) and COMC-II (1995), this new paintings is the fundamental reference textual content for any chemist or technologist who must use or practice organometallic compounds.
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Additional info for Comprehensive Organometallic Chemistry III, Volume 5 : Compounds of Groups 5 to 7
Am. Chem. Soc. 2000, 122, 4678–4691 with permission from The American Chemical Society. 73 All these complexes exhibit typical IR stretching bands for isocyanide ligands (see Table 3). Bis(6-naphthalene)vanadium(0) and its methyl ring-substituted derivative bis(6-1-Me-naphthalene)vanadium(0) react with 6 equiv. 76 "B). The bulky nature of the xylyl isocyanide ligand appears to be of critical importance for the stabilization of this thermally stable complex. Structure 12 can be reduced into unsolvated Cs with Cs/ graphite in THF, and is oxidized by [Cp2Fe][PF6] to afford [PF6].
5 equiv. 787(3) A. zwitterionic vanadium(II) complex 49, while for neutral 47 a ‘‘Wittig-like’’ reactivity is observed which results in the formation of an imido-vanadium(IV) species 50 (see Scheme 19). 160 This reaction probably involves -H migration in a putative phosphide intermediate [nacnac]V(TCHBut)(PHR). 161 One-electron oxidation of the latter with AgX (X ¼ OTf, BPh4) yields the neutral 53 or cationic 54 four-coordinate alkylidyne complexes. 8(3) represent the first terminal alkylidyne complexes of vanadium; they are stable as solids but transform slowly in solution to imido–vanadium complexes 55 supported by a chelating amido-vinyl ligand resulting from a cross-metathesis transformation (Scheme 19).
2). Thus, only the few new studies are presented below. According to IR spectroscopic studies of a variety of ring-substituted halfsandwich tetracarbonyl vanadium complexes in low temperature (ca. 195 In addition, photolysis of Cp* V(CO)4 in O2 matrices195 or argon matrices in the presence of O2196 led to the formation of Cp* V(CO)3(2-O2) with a side-on bonded O2 ligand. 197 Similarly, organometallic alkane198 and noble-gas (Xe)199 complexes CpV(CO)3(n-heptane) and CpV(CO)3(Xe) have been characterized by time-resolved IR spectroscopy in solution (n-heptane) or in supercritical fluids (Xe).