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Die Titelverbindung wurde durch Reaktion von Phenylhydrazin mit dem Dichloro‐Mo(IV)‐porphyrin‐Komplex mit 55% Ausb. dargestellt.

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alkyllithium compound 18. Ring-opening at the stage of the radical anion 15 should result in formation of n-propylbenzene 14 as the major product via the secondary radical 12. Additionally, the corresponding ethylene adducts are also obtained. Reaction of a mixture of a-methylbenzocyclobutene and 1 indicates that the latter is cleaved approximately twice as rapidly. The rates of separate runs, however, are not comparable, since the yields are markedly dependent on the nature of the lithium powder and on the mixing procedure. Received: October 15, 1982 [Z 179 IE] German version: Angew. Chem. 95 (1983) 248[I] N. L.