The fundamental concept of molecular discrimination considers the ability of a chemical object to identify, in the presence of alternative possibilities, a defined chemical counterpart through specific interactions. [1] When discrimination depends on the chiral properties of the chemical partners, only one of the events that derive from the possible stereochemical combinations can be realized. [1] In this context, a peculiar discrimination was observed during the self-coupling of racemic ketones that possess the bicyclo[2.2.1]heptene skeleton, either by means of aldol reactions or via organocuprate derivatives. The main feature of the reported uration in the formation of the unsupported metal ± metal bond. Furthermore, the steric bulk of the pyridonate rings does not hinder the formation the unsupported metal ± metal bond. Therefore, one could envisage the accessibility of a hypothetical tetrametallic chain made of two HT units.With the experimental confirmation of the intervention of HT dimers in tetrametallic chains, it seems likely that the lack of HT-pyridonate dimers in the platinum blues complexes should be attributed mainly to thermodynamic reasons rather than to steric factors.[1] For leading references see: a) R. Cle  rac, F.
The challenge to generate all‐syn architecture has prompted the synthesis of syn cyclotrimers 2 from racemic bromotrimethylstannyl polycyclic alkenes 1. The syn‐selective CuI‐catalyzed cyclotrimerization process is both regio‐ and chemoselective.
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