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Beilstein J. Org. Chem. 2026, 22, 257–273, doi:10.3762/bjoc.22.19
Graphical Abstract
Figure 1: Aromatic molecules as the foundation of modern molecular chemistry.
Figure 2: Arenes as springboards to three-dimensional chemical space and strategies toward arene activation v...
Figure 3: Structure and synthetic utilization of strained arenes; NICS: nucleus independent chemical shifts [26-28].
Figure 4: Bonding and reactivity of η2-coordinated aromatic systems [44,46].
Figure 5: Illustrative selection of η2-coordinating dearomatization agents; MeIm: N-methylimidazole, NHE: nor...
Figure 6: Preparation, lability and most stable linkage isomers of pentaammineosmium(II) complexes.
Scheme 1: Heteroatom-directed reactions of η2-arene complexes [45,50].
Figure 7: Latent functionality through transient metal binding.
Figure 8: Selective hydrogenation of η2-coordinated benzene to cyclohexene under ambient conditions [53,54].
Scheme 2: Synthesis and utilization of enantioenrichted Mo(η2-arene) complexes in enantioselective synthesis [55]....
Scheme 3: Synthesis of trisubstituted cyclohexenes from phenyl sulfones enabled by tungsten-mediated dearomat...
Scheme 4: Diels–Alder reactions of η2-arene complexes with alkenes and alkynes; NMM: N-methylmaleimide [64,65].
Scheme 5: Binding characteristics and pioneering examples of isolable η3-benzyl complexes.
Figure 9: Divergent functionalization of benzyl electrophiles leveraging η3-benzyl complexes toward benzylic ...
Scheme 6: p-Selective allylation of benzyl chlorides with allylstannanes and subsequent synthetic expansion o...
Figure 10: Strategies for para- and ortho-selective arene functionalization/dearomatization via η3-benzyl comp...
Scheme 7: Substrate-dependent ortho- and para-selective dearomatization of naphthyl chlorides and leveraging ...
Figure 11: η4-Arene coordination as an underexplored but promising pathway for arene activation [96,98-100].