Guy Marck

Aryl couplings with heterogeneous palladium catalysts

Abstract The coupling reaction of diverse phenylboronic acids with aryl halogenides and -triflates has been performed by the use of simple palladium hydrogenation catalysts. Evidence for a heterogeneous type of catalysis has been obtained.

New Nematics Incorporating a 2,6-Difluorophenyl Acetylene Group

Abstract A large series of thin film transistor compatible nematic liquid crystals incorporating a 2,6-difluorophenyl acetylene group have been synthesised. Most of them exhibit high clearing points and an increased dielectric anisotropy.

Novel Dopants for Ferroelectric Mixtures Incorporating Chiral Dioxane or Tetrahydropyrane Rings

Abstract The synthesis, mesomorphic properties and use as chiral dopants in ferroelectric mixtures of chiral dioxane and tetrahydropyrane derivatives are presented. The dioxanes induce a sufficiently high spontaneous polarisation and a very small pitch if added to achiral Sc-mixtures.