Rotaxanes transition-metal-controlled threading

IV. Transition-Metal-Controlled Threading A New Principle of Rotaxane Synthesis... 

Transition metal-controlled threading a new principle of rotaxane synthesis... 

Higher order [n]-rotaxanes could be, in principle, synthesized by the transition metal-controlled threading process, provided that the linear component contains the... 

Fig. 11 Principle of transition metal-templated synthesis of a [2]rotaxane. A thick line represents a dpp chelate, a black dot represents a metal cation, a hatched diamond represents a Au(III) porphyrin and an empty diamond represents a Zn(II) porphyrin. The transition metal controls the threading of Au(III) porphyrin-pendant macrocycle (A) onto chelate (B), to form prerotaxane (C). Construction of the porphyrin stoppers at the X functions leads to the metal complex [2]rotaxane (D). Removal of the template cation forms the free rotaxane (E)...

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