A simple synthetic route to tetrabenzo[16]- and hexabenzo[24]annulene systems using one-pot multiple Wittig reactions is presented. We report the characterization of the all-trans-isomer of tetrabenzo[16]annulene by NMR spectroscopy and X-ray diffraction. Several isomers of an unexpected, tetrabenzocyclooctatetraene dimer product are also isolated and identified by NMR- and X-ray diffraction studies