Recent studies have revealed that bis-ortho-chelated aryl-metal complexes, the socalled ECE-pincer metal complexes, exist in great varieties. Strategies for the preparation and application to catalysis of these ECE-pincer metal complexes will be described.
                                
                                            
 
             
             
                             
                         
                         
                                 
                                         
                                                                                                     
                 
            