New blood for crown ether chemistry! Beside the well-known organocrown ether sandwich complexes 1 there now exist topologically equivalent metallacrown ether complexes 2. These metallasandwich complexes are generated in a one-pot reaction by spontanous self-assembly and in one case have been unambiguously characterized by a crystallographic structure analysis.
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Saalfrank et al. (1996) studied this question.
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