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Keywords:

  • catalytic antibodies cations;
  • cyclopropanes;
  • molecular modeling;
  • nonclassical structures

A nonclassical, protonated cyclopropane is the intermediate formed in an antibodycatalyzed cyclization reaction. The selectivity in favor of the cyclopropane product is increased upon binding of the catalytic antibody, which amplifies the inherent preference for one reaction pathway.