The aromatic acyclic diynes 2 and 3 have been synthesised in order to
test the feasibility of a new activation towards their cyclisation. In
addition, a difference of stability between 13 and 20 during the Noza
ki-Kishi cyclisation reaction occurs when the aromatic ring possesses
or not an intramolecular trigger device. Thus, the aromatic bicyclic e
nediyne 14 is stable while 21 has not been isolated.