"Akihiko Takahashi,Yuko Hirose,Hiroyuki Kusama,Nobuharu Iwasawa","Chelation-assisted Electrocyclic Reactions of 3-Alkenyl-2,2�f-Bipyridines: An Efficient Method for the Synthesis of 5,6-Dihydro-1,10-phenanthrolines and 1,10-Phenanthrolines",,"Chem. Commun.",,,,"p. 609-611",2008,