The [28] tetraoxaporphyrinoids (4.2. 4.2) 6 are synthesized by cyclizing Wirzig reaction of (E, E)-5, 5'-(buta-1, 3-diene-1, 4-diyl) bis [furan-2-carbaldehyde](8) with (E, E)-{(buta-l, 3-diene- diyl) bis [(furan-5, 2-diyl) methylene]) bis-[triphenylphosphonium] dibromide (9) and 3, 3'- {[(E)-ethene-1, 2-diyl] bis (furan-5, 2-diyl)) bis [(E)-prop-2-enal](22) with (E)-{(ethene-1, 2- diyl) bis [(furan-5, 2-diyl) methylene]} bis [triphenylphosphonium] dibromide (23). An ...