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We have prepared a novel series of chiral macrocycles based on amino acid-linked bipyridines; the iron(iii) complexes of these ligands act as catalysts for alkene epoxidation.The remarkable stereoselectivity of many metalloenzymecatalysed reactions is due, in large part, to the chiral environment surrounding the metal. Synthetic macrocyclic ligands offer an attractive way of holding chiral groups in similar proximity to a metal centre in such a way that they can interact with an approaching substrate.' In designing potential

An oxidizing triple catalytic system is developed successfully which consists of Pd(OAc)2 + benzoquinone + a metal macrocycle as the third component; the latter used to reoxidize hydroquinone (formed in the catalytic cycle) by molecular O2.

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