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The use of single-walled carbon nanotubes as effective nanoreactors for preparative bimolecular reactions has been demonstrated for the first time. We show that the extreme spatial confinement of guest reactant molecules inside host carbon nanotubes increases the regioselectivity for the 1,4-triazole in thermally-initiated azide-alkyne cycloaddition reactions. Through comparison of the internal dimensions of the nanotube and the steric bulk of the reactants, we demonstrate that the formation ofdoi:10.1021/acs.jpcc.9b01190.s001 fatcat:t6rutpb76zd6xblxxruc54x6yu