Abstract
This mini-review focuses on recent advances on the synthesis, structure, and characterization of allyl-based rare earth organometallic complexes, with emphasis on their ability to catalyze the polymerization of non-polar monomers such as conjugated dienes, styrene, and their related copolymerization.
Highlights
Organometallic rare earths (REs) chemistry was first introduced at the beginning of the 20th century [1] but for some time it attracted little interest due to the lack of characterization—and, understanding—of these highly-reactive compounds
The [RE-(allyl)] moiety has been studied as a model for the chain initiation in olefin polymerization [17], and the coordination of the allyl ligand within the complexes, as well as the specificity of the rare earth metals used have shown to vary the outcome of the polymerizations
Mechanistic investigations, confirmed by the support of theoretical studies, demonstrated that the initiation of the polymerization resulted from the insertion of styrene into the RE-allyl or RE-alkyl moiety, and that an enantiomorphic site control mechanism (ECM) was operative to account for the isoselectivity observed [39]
Summary
Organometallic rare earths (REs) chemistry was first introduced at the beginning of the 20th century [1] but for some time it attracted little interest due to the lack of characterization—and, understanding—of these highly-reactive compounds. The [RE-(allyl)] species has demonstrated its ability to catalyze polymerization reactions, with a particular behavior towards non-polar monomers (Scheme 1), some of which are highly stereo-selective [14,15,16]. [18] reviewed allylpolymerized rare earth complexes had been studied over the past decades, along with their reactivity. Reviewed allylofrare earth complexes had we been studied oververy the enlarge the knowledge this[18]. In this that review, focus on the past decades, along with their reactivity. A number of reports have been published that recent development dealing with RE allyl compounds, highlighting their ability to catalyze the on particular class of compounds.
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