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A sa
mariu
m-pro
mote
d cyclopropanation of un
maske
d mages/gifchars/alpha.gif" BORDER=0>
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mi
ddle">-unsaturate
d aci
ds is
describe
d. This reaction can be carrie
d out on (
E)- or (
Z)-
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,mages/gifchars/beta2.gif" BORDER=0 ALIGN="
mi
ddle">-unsaturate
d carboxylic aci
ds. In all cases the process is co
mpletely stereospecific an
d stereoselective. A
mechanis
m has been propose
dto explain the cyclopropanation reaction.