title: Cyclic oligofurans: one-pot synthesis of 30pi and 40pi expanded porphyrinoids.
abstract: Acid-catalyzed condensation of furan and pentafluorobenzaldehyde yielded conjugated macrocycles with six and eight furan rings. They represent systems similar to annulenes with 30pi and 40pi electrons. From their structural analyses, it was found that furan rings in both the molecules were inverted in an alternative fashion and displayed nontwisted conformations. [structure: see text].
authors.affiliation: Photosciences & Photonics Group, Chemical Sciences & Technology Division, Regional Research Laboratory (CSIR), Trivandrum 695 019, India.
authors.forename: J Sreedhar
authors.initials: JS
authors.lastname: Reddy
authors.forename: Sukhendu
authors.initials: S
authors.lastname: Mandal
authors.forename: Venkataramanarao G
authors.initials: VG
authors.lastname: Anand