A Twisty "Hairpin Furan"
The thermal reaction of a cyclopentadienone with a dimethoxybinaphthoquinone
gives, in a single step, a molecular ribbon composed of two twisted aromatic
systems fused to a heteropentahelicene: a new class of chiral molecules, the
"hairpin furans". For a brief communication describing the synthesis and
structure of such molecules, see Geng, X., J. P. Donahue, J. T. Mague, and
R. A. Pascal, Jr., Angew. Chem. Int. Ed. 2015, 54, 13957-13960.