New Persistent Heteroarylmethyl Radicals Resulting from the Intramolecular Addition of Aryloxymethyl Radicals onto Ketenimines. Synthesis of 2H-1,4-Benzoxazines - Alajarín, Mateo; Vidal, Angel; Ortín, María-Mar; Bautista, Delia (Synlett, 2004)