ORGANOLITHIENS VINYLIQUES A FONCTION CARBONYLEE MASQUEE EQUIVALENTS SYNTHETIQUES D'ANIONS EN ω DU METHYL-3 SORBALDEHYDE
Functionalized organovinylic compounds 1 are prepared by bromine-lithium exchange in ether at -70 deg C.Their condensation with aldehydes and ketones leads to polyenals, directly in the case of 1c and 1d, in two steps in the case of 1a and 1b.Dehydrocitra