177178-10-8Relevant academic research and scientific papers
Syntheses of tantalum (V) complexes containing tetramethylpyrrolyl, pyrrolyl, and indolyl ligands
Parker, Keith G.,Noll, Bruce,Pierpont,Rakowski DuBois
, p. 3228 - 3234 (1996)
The reaction of TaMe3Cl2 with the lithium salt of tetramethylpyirole (Li-TMP) led to the formation of (η5TMP)TaMe3Cl (1). Reactions of 1 with a series of anionic ligands have been carried out to form products of the formula (η5-TMP)TaMe3X, where X = SR, Me, pyrrolyl, or indolyl. Crystals of (η5-TMP)TaMe3(mdolyl) (5), were isolated in space group P21/c with a = 8.957(2) A?, b = 28.540(6) A?, c = 14.695(3) A?, β= 99.40(3)°. V = 3706.1(14) A?3, and Z = 8. The structure confirmed the η5-bonding mode of the tetramethylpyrrolyl ligand and the η1-N-coordination mode of the indolyl ligand.The derivatives (η5-TMP)TaMe3X showed limited stability, and decomposition products which formed in toluene solutions at room temperature have been identified in some cases. The reaction of (η3-TMP)TaMe3(pyrrolyl) with hydrogen (2-3 atm) in benzene-d6 solution at room temperature was studied. The stoichiometric formation of cyclohexane-d6 by hydrogenation of an equivalent of solvent was confirmed by 1H and 13C NMR and gas chromatographic/mass spectroscopic data. The characteristics and scope of the room temperature arene hydrogenation process are discussed.
