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Coordination-induced reductive elimination from a titanium(IV) complex.
Paul Fritsche1, Lucia Geyer1, Corinna Czernetzki1
1Julius-Maximilians-Universität Würzburg, Institut für Anorganische Chemie, Am Hubland, 97074 Würzburg, Germany. gabriele.hierlmeier@uni-wuerzburg.de.
Titanium dibenzyl complexes with diamidopyridine ligands form titanacyclopentadienes when reacting with alkynes. This coordination-induced C-C reductive elimination reveals a novel radical mechanism for titanium-mediated carbon-carbon bond formation.
Area of Science:
- Organometallic Chemistry
- Titanium Chemistry
- Organic Synthesis
Background:
- Diamidopyridine ligands are known to support various transition metal complexes.
- Titanium complexes are versatile catalysts in organic synthesis.
- Understanding C-C bond formation mechanisms is crucial for developing new synthetic methodologies.
Purpose of the Study:
- To investigate the reactivity of diamidopyridine-supported titanium dibenzyl complexes with alkynes.
- To elucidate the mechanism of coordination-induced C-C reductive elimination.
- To gain new insights into titanium-mediated C-C bond formation.
Main Methods:
- Synthesis of diamidopyridine-supported titanium dibenzyl complexes.
- Reaction of the titanium complexes with various alkynes.
- Characterization of the reaction products, including titanacyclopentadienes.
- Mechanistic studies to probe the C-C reductive elimination pathway.
Main Results:
- Coordination-induced C-C reductive elimination was observed upon addition of alkynes.
- Quantitative formation of titanacyclopentadienes was achieved.
- A distinct radical mechanism was identified for this reductive elimination process.
Conclusions:
- Diamidopyridine-supported titanium dibenzyl complexes efficiently form titanacyclopentadienes via reaction with alkynes.
- The study reveals a novel radical mechanism for C-C bond formation involving titanium.
- These findings provide new mechanistic insights into titanium chemistry and C-C coupling reactions.
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