N,O-Chelating Four-Membered Metallacyclic Titanium(IV) Complexes for Atom-Economic Catalytic Reactions,Accounts of Chemical Research

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N,O-Chelating Four-Membered Metallacyclic Titanium(IV) Complexes for Atom-Economic Catalytic Reactions
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2015-08-06 00:00:00 , DOI: 10.1021/acs.accounts.5b00224
Scott A. Ryken ₁ , Laurel L. Schafer ₁

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Titanium, as the second most abundant transition metal in the earth’s crust, lends itself as a sustainable and inexpensive resource in catalysis. Its nontoxicity and biocompatibility are also attractive features for handling and disposal. Titanium has excelled as a catalyst for a broad range of transformations, including ethylene and α-olefin polymerizations. However, many reactions relevant to fine chemical synthesis have preferrentially employed late transition metals, and reactive, inexpensive early transition metals have been largely overlooked. In addition to promising reactivity, titanium complexes feature more robust character compared with some other highly Lewis-acidic metals such as those found in the lanthanide series. Since the advent of modulating ligand scaffolds, titanium has found use in a growing variety of reactions as a versatile homogeneous catalyst. These catalytic transformations include hydrofunctionalization reactions (adding an element–hydrogen (E–H) bond across a C–C multiple bond), as well as the ring-opening polymerization of cyclic esters, all of which are atom-economic transformations.

中文翻译：

N，O螯合四元金属环钛（IV）配合物用于原子经济催化反应

钛是地壳中含量第二高的过渡金属，适合作为催化的可持续且廉价的资源。其无毒和生物相容性也是处理和处置的诱人特征。钛作为催化剂广泛用于各种转化，包括乙烯和α-烯烃聚合。然而，与精细化学合成有关的许多反应优选使用了后期过渡金属，并且反应性，廉价的早期过渡金属被大大地忽略了。除有希望的反应性外，钛配合物与某些其他路易斯酸高的金属（如镧系元素中的那些）相比，具有更坚固的特性。自调节配体支架问世以来，钛已被发现在越来越多的反应中用作通用的均相催化剂。这些催化转化包括加氢官能化反应（在C-C多个键之间添加元素-氢（E-H）键），以及环酯的开环聚合，所有这些都是原子经济的转化。

更新日期：2015-08-06

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