Development of O,N-bidentate ruthenium catalysts for isomerization and kinetic studies of ruthenium carbenes for C=C coupling reactions

The fountainhead to develop the chemical science is the demand of various compounds by human being. While most of the requirements concerns organic molecules, organometallic compounds have paved the way of homogeneous catalysis in producing bulk, fine chemicals, and even natural products. During the last decade, ruthenium catalysts have provided new indispensable synthetic methods that cannot be promoted by other catalysts and applied in wide range of chemical reactions. This work deals with the development of O,N-bidentate ruthenium homogeneous catalysts for isomerization and kinetic studies of ruthenium cabenes for C=C coupling reactions. Specifically designed ligands are the key in optimizing the efficiency of catalysts. Schiff bases are known to strongly enhance the thermal and moisture stability of the corresponding complexes and isomerization is important in many chemical processes. The above reasons promote the first part of the work to concentrate on the synthesis of a novel class of homogeneous ruthenium complexes containing Schiff bases as O,N-bidentate ligands catalyzing the isomerization reaction. By a proper choice of the Schiff base, the new ruthenium complexes showed improved reactivity, selectivity and stability toward air and moisture during the isomerization reaction. The temperature and solvent tolerance was likewise substantially improved. Later, another series of analogue Schiff bases ruthenium complexes has been synthesized as isomerization catalysts and showed even better reactivity, selectivity and stability. The formation of carbon-carbon bonds is one of the most fundamental chemical processes. In this context, C=C coupling reactions (metathesis, cyclopropanation and etc.) make a significant contribution. Despite the recent advances, the search for commercially relevant catalyst systems remains challenging. The kinetic studies of ruthenium carbenes are useful for fundamental insight to design new catalysts or to improve existing catalytic systems. The second part of this work estabilished a pre-research for the future outlook.

Grantor dc:publisher

Ghent University. Faculty of Sciences

Year dc:date

2009

Author dc:creator

• Ding, Fu

Contributors dc:contributor

• Verpoort, Francis

• Chemistry

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://biblio.ugent.be/publication/758673
urn:isbn:978-90-5487-623-6
https://biblio.ugent.be/publication/758673/file/4335042

OAI identifier oai:identifier

oai:archive.ugent.be:758673