| Abstract: | Reactions of singly-bonded dinuclear complexes (η5-CH3O2CC5H4)2M2(CO)6] (I, M?=?Mo; II, M?=?W) with the diarenylditelluride 4-CH3C6H4Te]2 in refluxing toluene for 4–6?h afforded dinuclear complexes 1 and 2 trans/ae-(η5-RC5H4)2M2(CO)4(μ-ArTe)2] (Ar?=?4-CH3C6H4Te). Complexes 1 and 2 were also synthesized by reactions of triply-bonded dinuclear complexes (η5-CH3O2CC5H4)2M2(CO)4] (III, M?=?Mo; IV, M?=?W) with 4-CH3C6H4Te]2 in refluxing toluene for 1?h. Both complexes have been characterized by elemental analysis, 1H NMR, 13C NMR and IR spectroscopy and X-ray diffraction. Preliminary low-temperature NMR experiments on complexes 1 and 2 have revealed that in solution each complex goes through a rapid inversion of the butterfly four-membered ring M2Te2. |
