Transformation of Triazoles into Imidazoles

1,2,3-Triazoles are easily made by addition of azides to olefins but their further transformation to other useful compounds is not always possible.  A new process (Horneff T et al, J Am Chem Soc, 2008, 130, 14972) involves conversion of the triazole to a rhodium-carbene complex, with elimination of nitrogen, followed by reaction with nitriles to give imidazoles.