1-and 2-Phenylbiphenylene have been made from 1-and 2-lithiobiphenylene, respectively, by treatment with cyclohexanone followed by dehydration and dehydrogenation. 2- Phenylbiphenylene has also been made by pyrolysis of 4-and 5-phenyl-biphenylene-2, 2′- iodonium iodide with cuprous oxide. One new synthesis of 2, 7-di
