Reaction of 2-azidoethyl isocyanide 1, 2-azidophenyl isocyanide 2, or 2-nitrophenyl isocyanide 3 with complexes [Mo(CO)(3)(dppe)(py)] [4] or [W(CO)(3)(dppe)(NE CCH3)] [5] yields the isocyanide complexes [Mo(CO)(3)(dppe)(C NR)] ([6]: C NR = 1; [12]: C NR = 2; [13]: C NR = 3) and [W(CO)(3)(dppe)(C NR)] ([7]: C NR = 1; [14]: C NR = 2; [15]: C NR = 3). Reduction of the nitro or azido groups attached to the isocyanide figands by Zn/NH4Cl (azidoethyl or azidophenyl isocyanides) or Raney-nickel/hydrazine hydrate (nitrophenyl isocyanide) yields exclusively the complexes bearing the 2-amino-functionalized isocyanides. The normally unstable 2-amino-functionalized isocyanides are stabilized by M -> C NR back-bonding, which deactivates the isocyanide carbon atom for an intramolecular nucleophilic attack by the primary amine.
The chemical reactivity of fullerene C60 towards fac-Mo(CO)3 (MeCN)(dppe) and Mo(CO)4(dppe). Synthesis, characterization and reactions of the novel fullerene molybdenum derivative fac-Mo(CO)3(dppe)(η2-C60)
作者:Li-Cheng Song、Ying-Huai Zhu、Qing-Mei Hu
DOI:10.1016/s0277-5387(97)00370-7
日期:1998.1
The acetonitrile ligand of fac-Mo(CO)(3)(MeCN)(dppe)[dppe = bis-(1,2-diphenylphosphino)ethane] can be easily replaced by fullerene C-60 in chlorobenzene at about 80 degrees C to give exclusively fac-Mo(CO)(3)(dppe>(eta(2)-C-60), whereas fullerene C-60 reacted with Mo(CO)(4)(dppe) in refluxing chlorobenzene to afford an isomeric mixture of fac- and mer-Mo(CO)(3)(dppe)(eta(2)-C-60). These organomolybdenum C-60 derivatives were characterized by elemental analysis and spectroscopic techniques. In addition, the eta(2)-C-60 ligand in fac-Mo(CO)(3)(dppe)(eta(2)-C-60) was also found to be easily displaced by MeCN, PPh3 or pyridine to give corresponding fac-organomolybdenum complexes. (C) 1998 Elsevier Science Ltd. All rights reserved.