On-Surface Azide–Alkyne
Cycloaddition on Cu(111):
Does It “Click” in Ultrahigh Vacuum?
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Abstract
Using scanning tunneling microscopy, we demonstrate that
the 1,3-dipolar
cycloaddition between a terminal alkyne and an azide can be performed
under solvent-free ultrahigh vacuum conditions with reactants adsorbed
on a Cu(111) surface. XPS shows significant degradation of the azide
upon adsorption, which is found to be the limiting factor for the
reaction