From superphanes to beltenes*
Rolf Gleiter, Björn Hellbach, Silke Gath, and Rolf J. Schaller
Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
Abstract: This short review describes paths to superphanes with metal-stabilized cyclobutadiene and cyclopentadienone rings in a one-pot and stepwise fashion. The stepwise synthesis also led to a new class of belt-like systems with large rings composed of CpCo-stabilized cyclobutadiene rings connected with propane chains. Finally, our research yielded the first beltenes composed of alternating four- and eight-membered conjugated rings.
Keywords: superphanes; cyclacenes; cyclobutadiene; cobalt; beltenes.
*Paper based on a presentation at the 11th International Symposium on Novel Aromatic Compounds (ISNA-11), St. John's, Newfoundland, Canada, 14-18 August 2005. Other presentations are published in this issue, pp. 685-888..