“…Dirhodium( ii ) complexes act as sensors,1 show antitumor activity,2 are capable of cross-linking DNA,3 and can be used to control peptide structures by binding carboxylate side chains to the Rh core,4 thus enabling site-specific modifications of polypeptides and proteins 5. They act as Lewis acids to activate alkynes,6 as well as enynes7 or serve as hydrogenation catalysts 8. The well-known Rh( ii ) carbenoid9 and nitrenoid10 transfer catalysts are capable of catalyzing X–H insertions,11 cyclopropanations,11a,12 aziridinations,13 ylide formation,11a,14 and allylic oxidations 15.…”