Intramolecular 1,3-diyl trapping reactions. Use of a diylophile directly linked to the diyl. Preparation of bicyclic furans.

The chemistry of diazenes $\text{1}$-$\text{3}$, each of which possesses a diylophile directly linked by a CC bond to a latent 1,3-diyl, was investigated. Each undergoes a loss of nitrogen and conversion to products $\text{4}$-$\text{6}$ respectively.