Syntheses of tantalum(V) complexes containing tetramethylpyrrolyl, pyrrolyl, and indolyl ligands
- Univ. of Colorado, Boulder, CO (United States)
The reaction of TaMe{sub 3}Cl{sub 2} with the lithium salt of tetramethylpyrrole (Li-TMP) led to the formation of ({eta}{sup 5{minus}} TMP)TaMe{sub 3}Cl (1). Reactions of 1 with a series of anionic ligands have been carried out to form products of the formula ({eta}{sup 5}TMP)TaMe{sub 3}X, where X = SR, Me, pyrrolyl, or indolyl. Crystals of ({eta}{sup 5}-TMP)TaMe{sub 3}(indolyl) (5), were isolated in space group P2{sub 1}/c with a = 8.957(2) {Angstrom}, b = 28.540(6) {Angstrom} c = 14.695(3) {Angstrom}, {Beta} = 99.40(3){degrees}, V = 3705.1(14) {Angstrom}{sup 3}, and Z = 8. The structure confirmed the {eta}{sup 5}-bonding mode of the tetramethylpyrroly ligand and the eta{sup 1}-N-coordination mode of the indolyl ligand. The derivatives ({eta}{sup 5}-TMP)TaMe{sub 3}X showed limited stability, and decomposition products which formed in toluene solutions at room temperature have been identified in some cases. The reaction of ({eta}{sup 5}-TMP)TaMe{sub 3}(pyrrolyl) with hydrogen (2-3 atm) in benzene-d{sub 6} solution at room temperature was studied. The stoichiometric formation of cyclohexane-d{sub 6} by hydrogenation of an equivalent of solvent was confirmed by {sup 1}H and {sup 13}C NMR and gas chromatographic/mass spectroscopic data. The characteristics and scope of the room temperature arene hydrogenation process are discussed.
- OSTI ID:
- 391344
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 11 Vol. 35; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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