Definition of annulene
: any of a class of completely conjugated cyclic hydrocarbons (such as benzene or cyclooctatetraene) In 1991, a temperate rainforest near Puerto Montt in central Chile yielded a fungus that made annulene, a hydrocarbon that has a history going back to the first formulations of rocket fuel. — Buzzy Gordon, Americas, 1 Nov. 2007 This class of annulenes, which have few hydrogens and are considered high-energy because of their numerous triple bonds, has also drawn attention as potential precursors to new carbon allotropes. — Elizabeth Wilson, Chemical & Engineering News, 3 Mar. 1997 ◆Annulenes have the general chemical formula CnHn where n is an even number or CnHn + 1 if n is an odd number.
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