Tandem catalytic acrylonitrile cross-metathesis and hydrogenation of nitriles with ruthenium catalysts: direct access to linear α,ω-aminoesters from renewables.
ABSTRACT Fraternité, Solidarité & complémentarité en Catalyse: Tandem alkene cross-metathesis of acrylonitrile with long-chain alkene and hydrogenation catalysis is performed by using a single ruthenium-alkylidene catalyst precursor. The protocol allows the catalytic transformation of unsaturated fatty acids, derivatives of plant oils, into α,ω-aminoesters. A key step involves the reduction of nitrile-ester intermediates into aminoesters, the precursors of polyamides, with alkene metathesis catalyst residue under mild conditions.
- SourceAvailable from: 126.96.36.199Chemical Reviews 07/2007; 107(6):2411-502. · 41.30 Impact Factor
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ABSTRACT: There are strong incentives to develop the production of fuels, chemicals and materials from biomass. However, the extensive use of biomass for industrial production, particularly for biofuels which involves high tonnages, raises environmental and ethical issues that may throw some doubts on the sustainability of these processes. The processing cost of biomass must be decreased by designing new processing routes and catalytic systems because those employed for hydrocarbons are not adapted to the molecular structure of biomolecules. To avoid competition with food supply, lignocellulosic feedstocks should be used rather than traditional agricultural crops particularly for biofuel production. Life-cycle assessment, which takes into account all the inputs and outputs of a process/product, should be carried out to evaluate the environmental impact of processes and used as a decision-making tool for product development.ChemSusChem 02/2008; 1(8-9):734-7. · 7.48 Impact Factor
Article: The renewable chemicals industry.[show abstract] [hide abstract]
ABSTRACT: The possibilities for establishing a renewable chemicals industry featuring renewable resources as the dominant feedstock rather than fossil resources are discussed in this Concept. Such use of biomass can potentially be interesting from both an economical and ecological perspective. Simple and educational tools are introduced to allow initial estimates of which chemical processes could be viable. Specifically, fossil and renewables value chains are used to indicate where renewable feedstocks can be optimally valorized. Additionally, C factors are introduced that specify the amount of CO2 produced per kilogram of desired product to illustrate in which processes the use of renewable resources lead to the most substantial reduction of CO2 emissions. The steps towards a renewable chemicals industry will most likely involve intimate integration of biocatalytic and conventional catalytic processes to arrive at cost-competitive and environmentally friendly processes.ChemSusChem 02/2008; 1(4):283-9. · 7.48 Impact Factor