Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: catalysts of olefin metathesis

Sortuj według:

Ogranicz wyniki do:

Dobrze zdefiniowane rutenowe katalizatory metatezy olefin

Pietraszuk C.

Wiadomości Chemiczne

2005

[Z] 59, 5-6

405--467

Olefin metathesis has become an important synthetic tool in organic and polymer chemistry. The family of ruthenium based catalysts tolerant of normal organic and polymer processing conditions and preserving their catalytic properties in the presence of the majority of functional groups has allowed a great number of new applications. The monograph gives a review of literature on well-defined ruthenium catalysts of olefin metathesis published till the end of 2004. The activity of catalytic systems based on different ruthenium complexes in metathetic reactions has been characterised. The methods of obtaining alkylidene complexes of ruthenium showing catalytic activity in olefin metathetic transformations have been described together with the reactions in which these compounds can be used as precatalysts. Because of a large body of literature data on Grubbs catalysts and their significance in synthesis, much space is devoted to them, including the methods of their synthesis and the known processes leading to their decomposition. Elements of the mechanism of olefin metathesis the presence of Grubbs catalysts of the 1st and 2nd generation are presented together with the consequences for designing of new catalysts of the process. The catalysts containing a chelating alkylidene ligand, in particular the Hoveyda-Grubbs catalysts arousing increasing interest and already commercially available, have been discussed. Moreover, the paper provides characterisation of the cationic alkylidene complexes described by Hoffmann, allenylidene, vinylidene and alkylidynehydride complexes described by Werner. Preliminary results on obtaining chiral alkylidene ruthenium catalysts and their use in the asymmetric synthesis are also presented. Regarding a number of prospective commercial applications of metathesis in organic synthesis, the current status of the study on heterogenization of alkylidene ruthenium complexes in order to obtain active and stable catalysts for multiple use was described. The paper ends with a list of the most important, in the opinion of the author, monographs and review works on the application olefin metathesis catalysed by well-defined alkylidene complexes in organic and polymer synthesis.