Multiple cycloaromatization of novel aromatic enediynes bearing a triggering device on the terminal acetylene carbon
Aromatic enediynes (1) bearing a triggering device on the terminal acetylene carbon undergo thermal cyclization at 25°C to yield polyphenylenc ring systems (6, 9, 13, and 15(16)) giving radical intermediates, dehydrobenzene monoradical (12) and didehydrob