Syntheses of new lithio hexavinylogation reagents are described starting ei
ther from omega-bromo polyenacetal, omega-bromo polyenol ether or omega-bro
mo non conjugated aldehyde. The reactivity of the lithio reagents has been
tested by condensation with benzaldehyde; the resulting hexaenal has been o
btained in a one or two steps procedure. (C) 1999 Elsevier Science Ltd. All
rights reserved.