“…The only two cases of the cycloisomerization of a vinylbenzene system known at present are (a) the isomerization of as-phenyl-o-biphenylethylene (XI) into 9-phenyl-9,10-dihydrophenanthrene (XII), observed under the influence of phosphorus pentachloride (11,14), U-h and (6) the isomerization of l-methyI-2-a-naphthyl-l-cyclohexene (XIII), which, by cyclization and subsequent dehydrogenation, gives fluoranthene (XIV) (41):…”