In THF at 25 Deg, Et3P:CHMe reacts with heptanal, Me3CCHO, PhCHO and p-ClC6H4CHO to afford, after 2-4 h, the corresponding olefins in 89-99% yield. In each case the trans isomer prevails, cis/trans ratios ranging from 33:67 to 4:96. The remarkable cis-ster ...
1982