After eight: Reactions of dehydrobenzoannulenes induced by the addition of n-butyllithium led to the discovery of an unprecedented oxidative cyclodimerization, which forms eight-membered ring products in up to 30 % yield. The product contains two indeno[2,1-a]fluorene components connected by a single and a double bond, which result from three transannular bond formations.
If you can't find a tool you're looking for, please click the link at the top of the page to "Go to old article view". Alternatively, view our Knowledge Base articles for additional help. Your feedback is important to us, so please let us know if you have comments or ideas for improvement.