The highly reactive intermediates 1 and 2 with cumulative double bonds in para and ortho positions, respectively, react to give products with isolated triple bonds. Intermolecular dimerization of 1 yields a paracyclophanetetrayne, which assumes two conformations in the crystal. Compound 2 reacts by intramolecular cyclization affording a highly strained cycloocta-3-ene-1,5-diyne derivative.
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.