Azacrown Ligating Units

1(2 = /fi/4. The dashed line is a Michaelis-Menten plot calculated 

In conclusion, the bis-barium complex of 17 catalyzes the ethanolysis of anilide and ester substrates endowed with a distal carboxylate anchoring group (Table 5.7). The catalyst shows recognition ofthe substrate, induces fairly high reaction rates with catalytic turnover, and is subjected to competitive inhibition by carboxylate anions, as 

The low rate-enhancement brought about by the dinuclear complex in the reaction of 14 suggests a very modest formation, in the very dilute solution, of the productive intermediate 17 [SrOEt] [SrO2CR], a supramolecular complex composed of one molecule of ditopic ligand 17, two Sr ions, one EtO ion, and one substrate molecule. In contrast, the absence of any difference between mononuclear and dinuclear catalyst in the cleavage of 20 demonstrates that only one metal 

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