The transformation of alkanes remains a difficult challenge because of the relative inertness of the c-h and c-c bonds the rewards for asserting synthetic control. To date, two catalytic systems of alkane metathesis exist: (i) a single catalytic system prepared by surface organometallic chemistry, acting as multifunctional. Definitions of alkane metathesis, synonyms, antonyms, derivatives of alkane metathesis, analogical dictionary of alkane metathesis (english. Alkane metathesis in alkane metathesis acyclic alkanes are scrambled to higher and lower homologues with tantalum hydride supported on silica (sio2)tah at. Silica and alumina supported tantalum and tungsten hydrides were tested in alkane metathesis, for comparison of their catalytic properties in propane metathesis [w.
Methods for the conversion of both renewable and non-petroleum fossil carbon sources to transportation fuels that are both efficient and economically viable could. Alkane metathesis and related reactions reported by yang wang april 7, 2011 introduction alkanes are the major. Alkane metathesis and other tandem systems for catalytic hydrocarbon transformations olefins are ubiquitous as intermediates in the petrochemical. Ty - jour t1 - alkane metathesis by tandem alkane-dehydrogenation-olefin-metathesis catalysis and related chemistry au - haibach,michael c au - kundu,sabuj. With petroleum supplies dwindling, there is increasing interest in selective methods for transforming other carbon feedstocks into hydrocarbons suitable for. Alkyne metathesis is an organic reaction involving the redistribution of alkyne chemical bonds this reaction is closely related to olefin metathesismetal-catalyzed alkyne metathesis was.
Alkane metathesis is a chemical reaction in which alkanes are rearranged to give longer or shorter alkane products it is similar to olefin metathesis, except that olefin metathesis cleaves. Olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. Abstract with petroleum supplies dwindling, there is increasing interest in selective methods for transforming other carbon feedstocks into hydrocarbons suitable for transportation fuel. Alkane metathesis via tandem catalysis zheng huang a dissertation submitted to the faculty of the university of north carolina at chapel hill.
Alkane metathesis (am) has potentially tremendous applicability via converting low-value alkanes (c3-c9) from the fisher-tropsch process into linear alkanes in the. Primary products and mechanistic considerations in alkane metathesis 2 pages primary products and mechanistic considerations in alkane metathesis authors olivier maury + 8 olivier. 2 contents: • introduction • dehydrogenation of alkanes by pincer iridium complexes • alkane metathesis • dehydrogenation involving heteroatoms. A method of converting at least one first alkane to a mixture of at least one low molecular weight alkane (ie, a metathesis catalyst.
Metathesis reactions in total synthesis weinheim when the resulting alkene system is hydrogenated to give the corresponding alkane. Olefin metathesis, or alkene metathesis, is an important process in petroleum refining and in the synthesis of important compounds such as pharmaceuticals. The invention concerns an alkane metathesis catalyst, its production and use the catalyst comprises a group v, vi or vii metal alkyl with the metal in its.
Here we present the first experimental study to isolate and identify a surface tantalum carbene as the intermediate in alkane metathesis.
The activity in alkane metathesis of tungsten complexes grafted on gamma alumina raises many questions regarding the structure of the active site and the reaction. 1 i-j alkene metathesis i basic principles the nobel prize in chemistry 2005 yves chauvin institut français du pétrole, rueil-malmaison, france. Read from olefin to alkane metathesis: a historical point of view, angewandte chemie international edition on deepdyve, the largest online rental service for scholarly research with.