xylylenes造句

• Certain substituted derivatives of xylylenes are however highly stable, an example being tetracyanoquinodimethane.
• At high temperatures, benzocyclobutenes can undergo electrocyclic ring-opening to form " o "-xylylenes.
• "o "-Xylylenes generated in this way have been used prolifically in cycloaddition reactions, which restore the aromaticity to the benzene ring, while forming a new annulated species.
• This and other syntheses of " o "-xylylenes, and their subsequent dimerization by [ 4 + 4 ] cycloaddition to form cycloctyl structures, were used repeatedly in the synthesis of superphane.