title: A porphyrin with a C═C unit at its center.
abstract: The molecule (C═C)TTP (TTP = tetra-p-tolylporphyrin) and the triflate salt of its dication, [(C═C)TTP][OTf](2), have been synthesized and characterized. NMR spectroscopy, nucleus-independent chemical shift calculations, and the crystal structure of (C═C)TTP indicate that (C═C)TTP is antiaromatic and (C═C)TTP(2+) is aromatic.
authors.affiliation: Department of Chemistry, University of Alabama, Shelby Hall, 250 Hackberry Lane, Tuscaloosa, Alabama 35487, United States. tpvaid@ua.edu
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Vaid