Further Exploitation of Advanced Shell

FEAST [Further exploitation of advanced Shell technology] Not a single process but a range of processes for converting cyclic di-olefins into alpha-omega dienes. The catalyst is based on rhenium on alumina. Operated in France since 1986. 

Further Exploitation of Advanced Shell Technology (FEAST), 26 941 Fusain, 6 704... 

FEAST (further exploitation of advanced shell technology), another Shell process142-144 commercialized in 1986, utilizes a highly active promoted rhenium-on-alumina catalyst (100°C, 2 atm) to synthesize 1,5-hexadiene from 1,5-cyclo-octadiene [Eq. (12.30)] and 1,9-decadiene from cyclooctene [Eq. (12.31)] ... 

Terminal dienes (also called a,w-diolefins) are useful in ADMET polymerization. The scheme below shows a number of processes that were patented by Shell Oil Company and were designed to produce terminal dienes. The name FEAST (Further Exploitation of Advanced Shell Technology) was coined to describe these reactions, most of which involve metathesis. Assume that the catalyst is a generic carbene complex, L M=CRR. Propose mechanisms for the transformations indicated by an asterisk near the reaction arrow. 

There are many potential outlets for these kinds of product, viz. cross-linking agents, speciality (co)monomers, and starting materials in the preparation of various a,cu-disubstituted intermediates for the production of aroma chemicals, pharmaceuticals, and agricultural chemicals. The first commercial plant, operating under the name FEAST (Further Exploitation of Advanced Shell Technology), was opened in 1987 in Berre I Etang (France) and has a capacity of 3000 tons per year (Short 1987). 

Another related observation, exploited by Cheshire [5.8], is that in the SCA with a rectilinear trajectory it is actually the projectile, not the electron, that is in an inertial frame as it moves with constant velocity. We can exploit this if, instead of assuming the electron is fixed in position, we allow it to recoil freely. We are then presented with the situation of an electron scattering from the fixed projectile (in the opposite direction). This scattering problem can be treated with the Glauber approximation. Or, as the projectile-electron interaction is most often Coulombic, exactly This is the continuum Distorted Wave Approximation (CDWA). Here the correct off-energy-shell behavior can be inserted. A further important advance is to distort both exit and entrance channels. A last refinement is to recognise that the electron is neither free nor frozen, and to try to incorporate its attachment to the target more realistically. 

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