Thallium cyclopentadienyl, reaction with

In recent years, it has been proved that complex 120 is a unique species with a completely different chemical behaviour than that of previously reported compounds [44]. Its reactions with diolefins, oximes, and cyclopentadienyl thallium give rise to interesting organometallic compounds containing organic fragments, which are activated to afford carbon-carbon and carbon-heteroatom coupling reactions. 

Two other exchange reactions have been reported cyclopentadienyl-thallium and pentafluorophenylsilver react with a copper(I) halide to give cyclopentadienylcopper complexes (86) and pentafluorophenylcopper (203), respectively. 

There has been only one example of the synthesis of (r] -cyclopentadienyl)-bis(thiobenzoato)tantalum 20, which was achieved by the reaction of Ta(Cp)2X2 (X=C1, Br, I) with thallium thiobenzoate [110]. The molecular structure of 20 is a normal, bent sandwich geometry where the two thiocarboxylato ligands are planar and are monodentate through the sulfur atom (for bond distances, see Table 2) [110]. 

Cyclopentadienylthallium is a light yellow solid that decomposes at 230°. It is stable for several months if stored under N2 in a Schlenk flask kept in the dark. Slow decomposition takes place in the air and light, whereupon the solid turns brown, but pure product may be sublimed away from this material. The IR spectrum shows absorption bands at 3022, 1584, 995, and 725 cm" Cycloi>entadienylthallium is insoluble in most organic solvents. It may be handled in air, and it is normally heated at reflux in THF solution with the substrate for about 2h under an inert gas atmosphere. When allowed to react with metal halides, the insoluble thallium halide produced may be filtered from the reaction solution. Most cyclopentadienyl complexes are air- and moisture-sensitive and should be handled with appropriate techniques. ... 

An unprecedented cyclic structure was found in a rare example of an organo-actinide complex associated via 7r-interactions. The reaction of ThBr4(thf)4 in THF with one equivalent of cyclopentadienyl thallium followed by treatment with three equivalents of KOPr led to the formation of the highly unusual hexanuclear complex [(C5H5)Th2(OPr )v]3, 106 [102]. In the cyclic molecule three dinuclear Th2(OPr )v units are connected by bridging cyclopentadienyl ligands. The... 

---