Making Dibenzo[a,e]cyclooctene - an Emerging Ligand?

In this video I am synthesizing the ligand dibenzo[a,e[cyclooctene, employing various methods including cold finger sublimation to purify the products!
Xylene bromination:
www.orgsyn.org/...
Dibenzo[a,e]cyclooctene synthesis:
www.orgsyn.org/...
More information about NBS bromination:
chem.libretext...
en.wikipedia.o...
Synthesis of some complexes with the ligand (where I got structure from):
doi:10.1016/j.ica.2007.12.007