Abstract
We report on a case of autocatalytic feedback in a template directed synthesis of a self-complementary hexa-PNA from two trimeric building blocks. The course of the reaction was monitored in the presence of increasing initial concentrations of product by means of RP-HPLC. Kinetic modeling with the SimFit program revealed parabolic growth according to the so-called square-root law. The observed template effect, as well as the rate of the ligation, was significantly influenced by factors like nucleophilic catalysts, pH value, and uncharged co-solvents. Systematic optimization of the reaction conditions allowed us to increase the autocatalytic efficiency of the system by two orders of magnitude.
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