1H-cyclopropa[b]naphthalene reacts with PTAD, tetracyanoethylene (TCNE) and benzyne to afford insertion-products 3, 4, and 5. Cheletropic addition of dichlorocarbene to 2 provides cyclobutanaphthalene 6. Hydrolysis and reductive elimination of 6 result in the formation of 7 and 8.