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Keywords = oxygen functionalized cyclopentadienyl

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29 pages, 1441 KB  
Review
Titanocene Complexes Applied in Organic Transformations
by Mingming Yang, Deying Leng, Zhenhua Wang, Xiu Wang and Ziwei Gao
Catalysts 2025, 15(8), 779; https://doi.org/10.3390/catal15080779 - 15 Aug 2025
Cited by 1 | Viewed by 1038
Abstract
Titanium, the second most abundant and one of the cheapest, non-toxic transition metals in the Earth’s crust, is highly favorable for catalytic applications due to its widespread availability, low cost, low toxicity, and well-documented biocompatibility. However, because of its high affinity for oxygen [...] Read more.
Titanium, the second most abundant and one of the cheapest, non-toxic transition metals in the Earth’s crust, is highly favorable for catalytic applications due to its widespread availability, low cost, low toxicity, and well-documented biocompatibility. However, because of its high affinity for oxygen and inherent Lewis acidity, titanium complexes generally exhibit lower tolerance toward various functional groups compared with complexes of later transition metals. The incorporation of cyclopentadienyl ligands significantly enhances the structural tunability of these complexes in their 3D configuration. By modifying the ligand framework, it is possible to fine-tune the Lewis acidity of the central titanium atom as well as the lability and binding characteristics of the ligands. This strategy enables precise control over the catalytic performance of titanocene complexes. The main body of this review provides an overview of recent advances in titanocene catalysis within the field of chemical synthesis since 2019. It includes illustrative examples that demonstrate the substrate scope and practical applications of titanocene catalysts in the synthesis of complex organic molecules and natural products. Finally, the review outlines current research opportunities and strategic directions for future developments in titanocene-based catalysis. Full article
(This article belongs to the Section Catalysis in Organic and Polymer Chemistry)
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9 pages, 1071 KB  
Article
Synthesis and Characterization of Constrained Geometry Oxygen and Sulphur Functionalized Cyclopentadienylchromium Complexes and Their Use in Catalysis for Olefin Polymerization
by Ruiguo Zhao, Jun Ma, Hao Zhang and Jiling Huang
Molecules 2017, 22(5), 856; https://doi.org/10.3390/molecules22050856 - 22 May 2017
Cited by 9 | Viewed by 5828
Abstract
A series of constrained geometry O-functionalized cyclopentadienylchromium complexes (16) and a S-functionalized cyclopentadienylchromium complex (7) were first synthesized, characterized, and tested as catalyst precursors for the olefin polymerization. In the presence of MAO, the complexes exhibited high [...] Read more.
A series of constrained geometry O-functionalized cyclopentadienylchromium complexes (16) and a S-functionalized cyclopentadienylchromium complex (7) were first synthesized, characterized, and tested as catalyst precursors for the olefin polymerization. In the presence of MAO, the complexes exhibited high catalytic activity for the polymerization of ethylene. It is shown that ligand variations can have a substantial effect on catalyst activity and stability. The effect of Al/Cr ratio on catalytic activity was also studied. Full article
(This article belongs to the Special Issue Organometallic Catalysis for Olefin Polymerization/Oligomerization)
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