C2-symmetric metacyclophanes: a possible alternative to o,o'-bridged binaphthyls.
The trick with the chiral clamp: In metacyclophanes such as (P)-2 it is possible to stabilize one chiral conformation by means of a chiral clamp so effectively that at room temp. only this conformation is present. This conformation resembles that of a o,o'-bridged binaphthyls (for example (P)-1). New binaphthyl alternatives are thus made accessible.
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