Selective olefin metathesis of bifunctional or polyfunctional substrates in compressed carbon dioxide as reaction medium
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United States of America Patent
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Feb 19, 2002
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N/A
app pub date -
Oct 15, 1999
filing date -
Apr 18, 1997
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Abstract
Cyclic products are prepared by selective olefin metathesis of bifunctional or polyfunctional substrates in the presence of one or several homogeneous or heterogeneous metathesis catalysts in a reaction medium. The invention is characterized in that the substrates contain two or more functional groups in the form of substituted or non-substituted alkene or alkyne units and in that the reaction medium essentially consists of compressed carbon dioxide. Also disclosed is the preparation of cyclic or polymer products according to the disclosed process, the reaction temperature and total pressure being matched to ensure that the density of the reaction medium lies in a range d=0.2-1.5 g.multidot.cm.sup.-3 and that the product distribution is essentially controlled by the reaction medium density.
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