the intramolecular cycloalkylation of phenylacetonitrile
with a, u-dibromoalkanes in SCF-CO2 medium or other
solvents [4], the synthesis of diethyl carbonate from ethanol and
SCF-CO2 in the presence of potassium carbonate by employing a
phase transfer catalyst [5], a similar displacement reaction of
benzyl chloride with a nucleophile of potassium cyanide in the
presence of tetraheptyl ammonium chloride (THAC) [6], as well as
other nucleophilic displacements using supported phase transfer
agents in SCF-CO2 [7,8], etc. Furthermore, reports about the modification
of polymeric materials and free-radical initiated polymerization
by catalysis in SCF-CO2 are also available recently [9e11], as
well as some dispersion polymerization [12],