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Cyclic Oligofurans:  One-Pot Synthesis of 30π and 40π Expanded Porphyrinoids

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posted on 23.11.2006, 00:00 by J. Sreedhar Reddy, Sukhendu Mandal, Venkataramanarao G. Anand
Acid-catalyzed condensation of furan and pentafluorobenzaldehyde yielded conjugated macrocycles with six and eight furan rings. They represent systems similar to annulenes with 30π and 40π 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.