Phosphine sulfone-based

Phosphine Sulfonate-Based Catalysts Synthesis of Linear Copolymers of Ethene and Functionalized Olefins 816... 

The two most prominent examples of catalysts in the late transition metal-catalyzed ethene homopolymerization are the Ni- or Pd-based a-diimine 1 and phosphine sulfonate-based 2 catalysts (Figure 3). 

By comparison of the a-diimine catalysts with the phosphine sulfonate-based palladium catalyst system, the change from a symmetric to an asymmetric ligand stmcture is apparent on first sight. Here (as well as in other ligand systems Section 3.24.4.1.4), it could be shown that this leads to major differences in reactivity. Despite the partially open catalyst stmcture, these complexes are of remarkable stability and activity in... 

To date, the only example of an AN copolymerization reaction with ethene was reported by Kochi et Here, the phosphine sulfonate-based Pd catalyst was able to give several AN insertions in a linear PE backbone (Scheme 3). 

Scheme 29 Catalyst resting state in the MA insertion polymerization with phosphine sulfonate-based catalysts.

Shi, M., Chen, L.-H. Chiral phosphine Lewis base catalyzed asymmetric aza-Baylis-Hillman reaction of N-sulfonated imines with methyl vinyl ketone and phenyl acrylate. Chem. Commun. 2003,1310-1311. 

An extensive overview about employed phosphine sulfonate ligands and the reported combination of substituents and bases can be found in literature. The most commonly used ligand is the benzenesulfonic acid-detived 2-[bis(2-meth-oxyphenyl)phosphine]-benzenesulfonate or its toluene sulfonic acid-based analogue. Upon reaction with a... 

Scheme 30 Copolymerization of ethene and MA by (P 0)Pd-based phosphine sulfonate catalysts.

Beside these examples based on phosphine sulfonates, Bianchini et reported the use of phosphanylferrocenecar-... 

Tetraphenylsilane was modified with triphenylphosphine oxide and carbazole in order to make available blue-phosphorescent components. Phosphine oxide-based poly(arylene ethers) with sulfonate funetions were prepared for components of proton exchange membranes (Scheme 65). ... 

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