Abstract High-content Dewar benzene polymers and sterically congested [n]-ladderanes have been synthesized from [4π s+ 2π s] cyclobutadienemetal complex cycloaddition chemistry. In the former case, tetramethylcyclobutadiene-AlCl 3 is reacted with an acetylene- containing precursor polymer to yield> 95% Dewar benzene incorporation. In the latter case,[n]-ladderanes containing up to thirteen rings are prepared via a one-pot procedure ...
![Tricyclo[4.2.0.02,5]octa-3,7-diene,1,2,3,4,5,6,7,8-octamethyl- Structure](https://image.chemsrc.com/caspic/418/1448-74-4.png)