“…Most studies were carried out with the units of benzene, 1 furan, 9,10 naphthalene 2,4 and anthracene. 3,4 We recently extended the unit components by synthesizing the anti-[2+2] heterodimers of 9-cyanophenanthrene and small arenes (benzene and furan) 5 and the [2+2] heterodimers of acenaphthylenes and benzene. 6 To the best of our knowledge, only two studies comparing the properties of syn-and anti-[2+2] dimers, dibenzenes 1 and acenaphthylenes-benzene heterodimers, 6 have been reported.…”