Influence on transition-metal-arene complex formation of hydrogenation and rearrangement of polyaromatic substrates induced by aluminium trichloride. Octahydrophenanthrene complexes from tetralin: X-ray crystal structure of ?⁵-1,2,3,4,5,6,7,8,9,-endo-nonahydro-9-exo-methylphenanthrenyl(tricarbonyl)- manganese

Formation of cationic tricarbonylmanganese complexes of tetralin or 9, 10-dihydroanthracene from reactions of Mn(CO)₅Br with naphthalene or anthracene in the presence of AlCl₃ is attributed to action of the latter since it alone reduces the polyaromatic substrates under comparable conditions; reaction of tetralin with Mn(CO)₅Br-AlCl₃ affords in addition to the expected η⁶-tetralin-manganese cation an η⁶-octahydrophenanthrene analogue, the title neutral methyl derivative of which has been characterized by an X-ray crystal structure determination.