A Brief
Review on: Various Methods of Metal Catalyzed Olefin-Metathesis Reactions by Ahmed Nassar and Ratnesh Das* in Progress in Petrochemical Science_ International
Journal of Petrochemical Science
Abstract
In this short review, a
brief description about olefin metathesis (OM) by transition metal complexes is
presented. Metathesis reactions in olefin (organic eye compounds) are mostly
carried out using transition organic-metal complexes (OMC) such as ruthenium,
rhenium, molybdenum and
tungsten based, schorock, grubb’s, Hoveyda-grubb’s catalyst etc. These
catalysts cause redistribution of π-bond of alkene by cross scission and
rearrangement in compounds by the formation of cyclic (2+2cycloaddition) intermediate.
OM reactions are efficiently used for the synthesis of neohexene by dimers of
isobutene, conversion of detergent by shell higher olefin process and synthesis
of many drugs.
Introduction
Metathesis of olefins is
developed as catalytic synthesis method which is applied for synthesis in
organic compounds like basic and fine laboratory chemicals, active
pharmaceutical ingredients and it may also use as polymeric, noble materials.
Olefin metathesis reactions are following particular mechanism just like
ring-opening metathesis reaction, ring closing metathesis reaction, and acyclic
diene metathesis reaction, cross metathesis reactions are following the
formation of met allocyclic intermediate [1-9]. By the development in the
structure of transition metal complexes, they get catalyze enzyme metathesis
reactions with high turnover, and emerged a high interesting research area to
produce various substitution in olefins. Organometallic catalysts are very
efficient for these reactions like ruthenium hydrides [10-14], Grubbs-I
catalyst [15], palladium [16], Hoveyda-Grubbs pre-catalyst on zirconia membrane [17]. Fogg et
al. [18] have reported that olefin metathesis is used as a technology for
Industrial production of derivative of olefin.
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