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While the non-enzymatic ligation and template-directed synthesis of peptide nucleic acids (PNA) have been reported since 1995, a case of self-replication of PNA has not been achieved yet. Here, we present evidence for autocatalytic feedback in a template directed synthesis of a self-complementary hexa-PNA from two trimeric building blocks. The course of the… (More)
A platinum-catalyzed domino process with intermediate benzopyrylium cations reaches its optimum utility in the formation of 7- and 8-membered rings. With iron(III) chloride, a tetracyclic product is isolated, derived from an oxidative transformation of a metal-carbene intermediate.