Synthesis Of Novel System Spiro-Heterocyclic By Diels-Alder Reaction Catalysed With Ticl4 For [4+2] Cycloaddion. Journal of Pharmaceutical Negative Results, [S. l.], p. 3569–3576, 2023. DOI: 10.47750/pnr.2023.14.03.443. Disponível em: https://www.pnrjournal.com/index.php/home/article/view/9705.. Acesso em: 8 jun. 2026.