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A novel chro
miu
m-pro
mote
d alkyl- an
d silyl cyclopropanation of (
E)- or (
Z)-
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mi
ddle">-unsaturate
d a
mi
des in which the C-C
double bon
d is
di-, ortrisubstitute
d is
describe
d. This process takes place with total stereospecificity, an
d the new stereogenic center is generate
d with high or totalstereoselectivity. A
mechanis
m is propose
d to explain the cyclopropanation reaction.