Are benzoylium and nitrilium ions produced from substituted 2‐arene‐2‐oxazolines during mass spectrometry?: a study based on density functional theory calculations, quantum theory of atoms in molecules, and electrospray ionization tandem mass spectrometry - Borges, Letícia da Silva; Batista, João Henrique Carvalho; Bozzini, Leandro Alves; Lourenço Júnior, Celso Donizete; Lopes, Norberto Peporine; Clososki, Giuliano Cesar; Vessecchi, Ricardo (Rapid Communications in Mass Spectrometry, 2023)