Syntheses of Tantalum(V) Complexes Containing Tetramethylpyrrolyl, Pyrrolyl, and Indolyl Ligands
- 1 January 1996
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 35 (11) , 3228-3234
- https://doi.org/10.1021/ic9509544
Abstract
The reaction of TaMe3Cl2 with the lithium salt of tetramethylpyrrole (Li−TMP) led to the formation of (η5-TMP)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(indolyl) (5), were isolated in space group P21/c with a = 8.957(2) Å, b = 28.540(6) Å, c = 14.695(3) Å, β = 99.40(3)°, V = 3706.1(14) Å3, 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 (η5-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.Keywords
This publication has 74 references indexed in Scilit:
- Pentamethylcyclopentadienyl Borollide Complexes of Tantalum: New Group 4 Metallocene MimicsJournal of the American Chemical Society, 1995
- Organotransition-Metal Metallacarboranes. 36. A Remarkably Stable Transition-Metal-Benzyne Complex: Synthesis and Structure of Cp(PMe3)(.eta.2-C6H4)Ta(Et2C2B4H4)Journal of the American Chemical Society, 1995
- Chalcogenometalate Complexes of NbV and TaV. Synthesis and Structural Characterization of the Et4N+ Salts of the[(E)3M(StBu)]2- Complexes (E = S, M = Nb, Ta; E = Se, M = Nb) and of (Ph4P)2[(S)3M(OMe)]Inorganic Chemistry, 1994
- The deceptively simple thermolysis of trivalent permethyltitanocene derivatives (.eta.5-C5Me5)2TiR. Formation of a tetramethylfulvene titanium compound (.eta.6-C5Me4CH2)(.eta.5-C5Me5)Ti and RH, catalyzed by permethyltitanocene hydride, (.eta.5-C5Me5)2TiHJournal of the American Chemical Society, 1992
- Isolation of a new series of seven-coordinate hydride compounds of tantalum(V) and their involvement in the catalytic hydrogenation of arene ringsJournal of the American Chemical Society, 1991
- Hydrodenitrogenation CatalysisCatalysis Reviews, 1988
- Roles of neutral and anionic ruthenium polyhydrides in the catalytic hydrogenation of ketones and arenesJournal of the American Chemical Society, 1987
- Catalytic hydrogenation of aromatic hydrocarbons. Stereochemical definition of the catalytic cycle for .eta.3-C3H5Co(P(OCH3)3)3Journal of the American Chemical Society, 1981
- Pyrrolyl complexes of the early transition metals. 1. Synthesis and crystal structure of (.eta.5-C5H5)2Ti(.eta.1-NC4H4)2, (.eta.5-C5H5)2Zr(.eta.1-NC4H4)2, and [Na(THF)6]2[Zr(.eta.1-NC4H4)6]Inorganic Chemistry, 1980
- Hydrogenation of arenes with discrete coordination catalysts. III. Synthesis and nuclear magnetic resonance spectrum of all-cis-cyclohexane-d6Journal of the American Chemical Society, 1975