From [10]Paracyclophane to Ferrocenophanones: The Search for Molecular Machines and Bio‐Organometallic Anticancer Drugs

Abstract A partial quenching of the NMR ring current in [10]paracyclophane‐chromium tricarbonyl prompted a study of other metal–arene π complexes, several of which exhibited restricted intramolecular motion relevant to their potential use in molecular machines. An attempted Diels–Alder reaction of 9‐phenylethynyl‐9 H ‐fluorene with tetracyclone instead yielded a novel tetracene by isomerization of the alkyne to the corresponding allene, and …