Abstract
Two new unsymmetrical Schiff base macrocycles with isosceles triangle shapes have been prepared. The macrocycles adopt cone-shaped conformations that rapidly interconvert at high temperature. Dynamic NMR studies show that the macrocycle that is tautomerized to the keto-enamine isomer is slower to flip than is the one in the enol-imine state. These macrocycles are good hosts for binding organic cations in their interiors.
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