No abstract

No abstract

No abstract

No abstract

Complexes of copper and 1,10-phenanthroline have been utilized for organic transformations over the last 50 years. In many cases these systems are impacted by reaction conditions and perform best under an inert atmosphere. Here we explore the role the 1,10-phenanthroline ligand plays on the electronic structure and redox properties of copper coordination complexes, and what benefit related ligands may provide to enhance copper-based coupling reactions. Copper(II) triflate complexes bearing 1,10-phenanthroline (phen), ([Cu(phen) 2 -(OTf )]OTf, 1) and oxidized derivatives of phen including [Cu(edhp) 2 ](OTf ) 2 (2), [Cu(pdo) 2 ](OTf ) 2 (3), [Cu(dafo) 2 ](OTf ) 2 (4) [a] Previously, we have reported a discrete Cu 2+ phen complex, namely [Cu(phen) 2 OTf ]OTf (1), [14] which shows a good reactivity performing C-and N-atom transfer reactions. [15] However, the phen ligand can be easily oxidized to functionalize the central ring of this ligand system. The C=C bond between C5 and C6 positions can be oxidized to form the 5,6-epoxyphen (L2) [16] and 5,6-phendione (L3). [17] L3 can be further reacted to form the 4,5-diazafluorenone (L4) by the loss of CO. [18] These ligands Full Paper