87 research outputs found
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Molybdenum and Tungsten Structural Differences are Dependent on ndz2/(n + 1)Ñ• Mixing: Comparisons of (silox)3MX/R (M = Mo, W; silox = tBu3SiO)
Article discussing molybdenum and tungsten structural differences being dependent on ndz2/(n + 1)s mixing and a comparison of (silox)3MX/R (M = Mo, W; silox - tBu3SiO)
Dialkyl and Methyl-Alkyl Zirconocenes: Synthesis and Characterization of Zirconocene-Alkyls That Model the Polymeryl Chain in Alkene Polymerizations
Zirconium and Titanium Propylene Polymerization Precatalysts Supported by a Fluxional C
Transformations of Group 7 Carbonyl Complexes: Possible Intermediates in a Homogeneous Syngas Conversion Scheme
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Redox non-innoence permits catalytic nitrene carbonylation by (dadi)Ti=NAd (Ad = adamantyl)
This article describes (dadi)Ti(X/L) species that manifest redox non-innocence (RNI), including a rare instance in which carbon monoxide does not affect redox activity at the metal, and does not bind, thus permitting its use as a substrate in catalysis
Covalent Metal−Organic Networks: Pyridines Induce 2-Dimensional Oligomerization of (μ-OC 6
Oxidatively Triggered Carbon–Carbon Bond Formation in Ene-amide Complexes
Ene-amides
have been explored as ligands and substrates for oxidative coupling.
Treatment of CrCl<sub>2</sub>, Cl<sub>2</sub>FeÂ(PMe<sub>3</sub>)<sub>2</sub>, and Cl<sub>2</sub>Copy<sub>4</sub> with 2 equiv of {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}Li afforded pseudosquare planar {η<sup>3</sup>-C,C,N-(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}<sub>2</sub>Cr (<b>1</b>-Cr, 78%), trigonal {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}<sub>2</sub>FeÂ(PMe<sub>3</sub>) (<b>2</b>-Fe, 80%), and tetrahedral {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}<sub>2</sub>CoÂ(py)<sub>2</sub> (<b>3</b>-Co, 91%) in very good yields.
The addition of CrCl<sub>3</sub> to <b>1</b>-Cr, and FeCl<sub>3</sub> to <b>2</b>-Fe, afforded oxidatively triggered C–C
bond formation as <i>rac</i>-2,2′-diÂ(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>Nî—»)<sub>2</sub>dicyclohexane
(<b>EA</b><sub>2</sub>) was produced in modest yields. Various
lithium ene-amides were similarly coupled, and the mechanism was assessed
via stoichiometric reactions. Some ferrous compounds (e.g., <b>2</b>-Fe, FeCl<sub>2</sub>) were shown to catalyze C-arylation
of {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}Li with PhBr, but the reaction was variable. Structural
characterizations of <b>1</b>-Cr, <b>2</b>-Fe, and <b>3</b>-Co are reported
Oxidatively Triggered Carbon–Carbon Bond Formation in Ene-amide Complexes
Ene-amides
have been explored as ligands and substrates for oxidative coupling.
Treatment of CrCl<sub>2</sub>, Cl<sub>2</sub>FeÂ(PMe<sub>3</sub>)<sub>2</sub>, and Cl<sub>2</sub>Copy<sub>4</sub> with 2 equiv of {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}Li afforded pseudosquare planar {η<sup>3</sup>-C,C,N-(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}<sub>2</sub>Cr (<b>1</b>-Cr, 78%), trigonal {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}<sub>2</sub>FeÂ(PMe<sub>3</sub>) (<b>2</b>-Fe, 80%), and tetrahedral {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}<sub>2</sub>CoÂ(py)<sub>2</sub> (<b>3</b>-Co, 91%) in very good yields.
The addition of CrCl<sub>3</sub> to <b>1</b>-Cr, and FeCl<sub>3</sub> to <b>2</b>-Fe, afforded oxidatively triggered C–C
bond formation as <i>rac</i>-2,2′-diÂ(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>Nî—»)<sub>2</sub>dicyclohexane
(<b>EA</b><sub>2</sub>) was produced in modest yields. Various
lithium ene-amides were similarly coupled, and the mechanism was assessed
via stoichiometric reactions. Some ferrous compounds (e.g., <b>2</b>-Fe, FeCl<sub>2</sub>) were shown to catalyze C-arylation
of {(2,6-<sup>i</sup>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)Â(1-<sup>c</sup>Hexenyl)ÂN}Li with PhBr, but the reaction was variable. Structural
characterizations of <b>1</b>-Cr, <b>2</b>-Fe, and <b>3</b>-Co are reported
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