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20. Trujillo-Ferrara, J.*; Santillan, R.; Beltrán, H. I.; Farfán, N.; Höpfl, H. 1H and 13C NMR Spectra for a Series of Arylmaleamic Acids, Arylmaleimides, Arylsuccinamic Acids and Arylsuccinimides. Magn. Reson. Chem. 1999, 37 (9), 682–686. DOI: 10.1002/(SICI)1097-458X(199909)37:9<682::AID-MRC500>3.0.CO;2-#

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18. Cea-Olivares, R.*; Garcı́a-Montalvo, V.; Hernández-Ortega, S.; Rodrı́guez-Narváez, C.; y Garcı́a, P. G.; López-Cardoso, M.; de March, P.; González, L.; Elias, L.; Figueredo, M. On the Easy Oxidation of (R)-2-[N-(1-Phenylethyl) Amino]-1-Cyclopentenedithiocarboxylic Acid to Its Disulfide Dimer. Tetrahedron: Asymmetry 1999, 10 (17), 3337–3340. DOI: 10.1016/S0957-4166(99)00354-7

17. Höpfl, H.*; Barba, V.; Vargas, G.; Farfan, N.*; Santillan, R.; Castillo, D. X-Ray Crystallographic Study of Three (N→B)-Borinates Prepared from 8-Hydroxyquinoline and 2-Hydroxypyridine. Chem. Heterocycl. Compd. 1999, 35 (8), 912–927. DOI: 10.1007/BF02252159

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14. Barba, V.; Hernandez, C.; Rojas-Lima, S.; Farfan, N.; Santillan, R. Preparation of N-Aryl-Substituted Spiro-β-Lactams via Staudinger Cycloaddition. Can. J. Chem. 1999, 77 (12), 2025–2032. DOI: 10.1139/v99-212

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