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  79. García-Báez, E. V.; López-Romero, B. A.; Martínez-Martínez, F. J.; Höpfl, H.; Padilla-Martínez, I. I. Dimethyl N,
    N'-(1,2-phenylene)dicarbamate. Acta Crystallogr. Sect. E Struct. Rep. Online 2004, 60.
  80. García-Zarracino, R.; Höpfl, H. A 3D hybrid network containing large spherical cavities formed through a
    combination of metal coordination and hydrogen bonding. Angew. Chem. Int. Ed. 2004, 43.
  81. Magaña-Vergara, N. E.; Martínez-Martínez, F. J.; Padilla-Martínez, I. I.; Höpfl, H.; García-Báez, E. V. N-cyclohexyl-
    2-oxo-2H-1-benzopyran-3-carboxamide. Acta Crystallogr. Sect. E Struct. Rep. Online 2004, 60.
  82. Martínez-Martínez, F. J.; Rojas-Pérez, R. E.; García-Báez, E. V.; Höpfl, H.; Padilla-Martínez, I. I. Diethyl piperazine-
    1,4-diyldioxalate. Acta Crystallogr. Sect. C Cryst. Struct. Commun. 2004, 60.
  83. Pérez-Vargas, J. E.; Martínez-Martínez, F. J.; Padilla-Martínez, I. I.; Höpfl, H.; García-Báez, E. V. Ethyl (e)-3-(2-
    hydroxyphenyl)-2-(morpholinocarbonyl)propenoate. Acta Crystallogr. Sect. C Cryst. Struct. Commun. 2004, 60.
  84. Rodríguez-Cuamatzi, P.; Vargas-Díaz, G.; Höpfl, H. Modification of 2D water that contains hexameric units in chair
    and boat conformations - A contribution to the structural elucidation of bulk water. Angew. Chem. Int. Ed. 2004, 43.
  85. Rodríguez-Cuamatzi, P.; Vargas-Díaz, G.; Maris, T.; Wuest, J. D.; Höpfl, H. 1,4-Phenylenediboronic acid. Acta
    Crystallogr. Sect. E Struct. Rep. Online 2004, 60.
  86. Román-Bravo, P.; López-Cardoso, M.; García Y García, P.; Höpfl, H.; Cea-Olivares, R. Template-assisted self
    assembly of two lipophilic polyion aggregates derived from sodium tetraphenyl imidodiphosphinate-complexes
    containing sodium ions in four different coordination environments. Chem. Commun. 2004, 10.
  87. Sánchez, M.; Sánchez, O.; Höpfl, H.; Ochoa, M.-E.; Castillo, D.; Farfán, N.; Rojas-Lima, S. New boronates prepared
    from 2,4-pentanedione derived ligands of the NO2 and N2O2 type - Comparison to the complexes obtained from the
    corresponding salicylaldehyde derivatives. J. Organomet. Chem. 2004, 689.
  88. Trujillo-Ferrara, J. C.; Padilla-Martínez, I. I.; Martínez-Martínez, F. J.; Höpfl, H.; Farfan-García, N.; García-Báez, E.
    V. The E and Z isomers of 3-(benzoxazol-2-yl)prop-2-enoic acid. Acta Crystallogr. Sect. C Cryst. Struct. Commun.
    2004, 60.
  89. Vargas, G.; Hernández, I.; Höpfl, H.; Ochoa, M.-E.; Castillo, D.; Farfán, N.; Santillan, R.; Gómez, E. Preparation and
    structural characterization of three types of homo- and heterotrinuclear boron complexes: Salen{[B-O-B][O2BOH]},
    salen{[B-O-B][O2BPh]}, and salen{[B-O-B][O2P(O)Ph]}. Inorg. Chem. 2004, 43.
  90. García-Báez, E. V.; Gómez-Castro, C. Z.; Höpfl, H.; Martínez-Martínez, F. J.; Padilla-Martínez, I. I. Ethyl N-
    phenyloxamate. Acta Crystallogr. Sect. C Cryst. Struct. Commun. 2003, 59.
  91. García-Báez, E. V.; Martínez-Martínez, F. J.; Höpfl, H.; Padilla-Martínez, I. I. p-Stacking interactions and C-H?X (X
    = O, aryl) hydrogen bonding as directing features of the supramolecular self-association in 3-carboxy and 3-amido
    coumarin derivatives. Cryst. Growth Des. 2003, 3.
  92. García-Báez, E. V.; Martínez-Martínez, F. J.; Höpfl, H.; Padilla-Martínez, I. I. Supramolecular assembly of 2-
    aminobenzothiazole and N-[(2-oxo-2H-1- benzopyran-3-yl)carboxyl]phenethylamide donor-acceptor complex. A
    comparative study. Arkivoc 2003, 2003.
  93. García-Zarracino, R.; Ramos-Quiñones, J.; Höpfl, H. Self-assembly of dialkyltin(IV) moieties and aromatic
    dicarboxylates to complexes with a polymeric or a discrete trinuclear macrocyclic structure in the solid state and a
    mixture of fast interchanging cyclooligomeric structures in solution. Inorg. Chem. 2003, 42.
  94. Martínez-Martínez, F. J.; García-Báez, E. V.; Höpfl, H.; Padilla-Martínez, I. I. The 2-aminobenzothiazole-N-benzyl2-
    oxo-2H-1-benzopyran-3-carboxamide (1/1) donor-acceptor complex. Acta Crystallogr. Sect. E Struct. Rep. Online
    2003, 59.
  95. Padilla-Martínez, I. I.; Chaparro-Huerta, M.; Martínez-Martínez, F. J.; Höpfl, H.; García-Báez, E. V. Diethyl N,N'-m-
    phenylenedioxamate. Acta Crystallogr. Sect. E Struct. Rep. Online 2003, 59.
  96. Padilla-Martínez, I. I.; García-Báez, E. V.; Höpfl, H.; Martínez-Martínez, F. J. 2-Amino-1,3-benzothiazole-ethyl
    coumarin-3-carboxylate (1/1). Acta Crystallogr. Sect. C Cryst. Struct. Commun. 2003, 59.
  97. Sartillo-Piscil, F.; Cruz, S.; Sánchez, M.; Höpfl, H.; De Parrodi, C. A.; Quintero, L. Conformational analysis of cyclic
    phosphates derived from 5-C' substituted 1,2-O-isopropylidene-a-D-xylofuranose derivatives. Tetrahedron 2003, 59.
  98. Trujillo-Ferrara, J.; Vázquez, I.; Espinosa, J.; Santillan, R.; Farfán, N.; Höpfl, H. Reversible and irreversible inhibitory
    activity of succinic and maleic acid derivatives on acetylcholinesterase. Eur. J. Pharm. Sci. 2003, 18. PDF
  99. García-Zarracino, R.; Ramos-Quiñones, J.; Höpfl, H. Preparation and structural characterization of six new
    diorganotin(IV) complexes of the R2Sn(SaleanH2) and R2Sn (SalceanH2) type (R = Me, nBu, Ph). J. Organomet.
    Chem. 2002, 664.
  100. Sánchez, M.; Keizer, T. S.; Parkin, S.; Höpfl, H.; Atwood, D. A. Salen-supported dinuclear and trinuclear boron
    compounds. J. Organomet. Chem. 2002, 654.
  101. Sánchez, M.; Höpfl, H.; Ochoa, M.-E.; Farfán, N.; Santillan, R.; Rojas-Lima, S. Facile preparation of [4.4]
    metacyclophane- and [5.5]paracyclophane-type macrocycles from arylboronic acids and salicylideneaminoaryl
    alcohols. Chem. Eur. J. 2002, 8.
  102. Ugalde-Saldívar, V. M.; Sosa-Torres, M. E.; Ortiz-Frade, L.; Bernès, S.; Höpfl, H. Novel iron(II) complexes with
    hexadentate nitrogen ligands obtained via intramolecular redox reactions. J. Chem. Soc. Dalton Trans. 2002.
  103. Ochoa, Ma. E.; Rojas-Lima, S.; Höpfl, H.; Rodríguez, P.; Castillo, D.; Farfán, N.; Santillan, R. Facile synthesis of
    1,3,6-oxadiazepines from 2,2'-(1,2-ethanediyldiimino)bisphenols. Tetrahedron 2001, 57.
  104. Padilla-Martínez, I. I.; Martínez-Martínez, F. J.; García-Báez, E. V.; Torres-Valencia, J. M.; Rojas-Lima, S.; Höpfl, H.
    Further insight into three center hydrogen bonding. Participation in tautomeric equilibria of heterocyclic amides. J.
    Chem. Soc. Perkin Trans. 2 2001.
  105. Sánchez, M.; Hópfl, H.; Ochoa, M.-E.; Farfán, N.; Santillan, R.; Rojas, S. Preparation of seven- and eight-membered
    boron heterocycles from different salen ligands and arylboronic acids. Inorg. Chem. 2001, 40.
  106. Ugalde-Saldívar, V. M.; Sosa-Torres, M. E.; Ortiz-Frade, L.; Bernès, S.; Höpfl, H. Novel iron(II) complexes with
    hexadentate nitrogen ligands obtained via intramolecular redox reactions. Journal of the Chemical Society, Dalton
    Transactions 2001. PDF
  107. Rojas-Lima, S.; Farfan, N.; Santillan, R.; Castillo, D.; Sosa-Torres, M. E.; Hopfl, H. Comparative structural
    characterization of the biquaternized N-CH3 and N-BH3 derivatives of the cis-cyclen and cis-cyclam condensation
    products with glyoxal. Tetrahedron 2000, 56.
  108. Farfán, N.; Höpfl, H.; Barba, V.; Ochoa, M. E.; Santillan, R.; Gómez, E.; Gutiérrez, A. New perspectives for boronic
    esters in macrocyclic chemistry. J. Organomet. Chem. 1999, 581. PDF
  109. Höpfl, H. The tetrahedral character of the boron atom newly defined - A useful tool to evaluate the N ? B bond. J.
    Organomet. Chem. 1999, 581. PDF
  110. Höpfl, H.; Barba, V.; Vargas, G.; Farfán, N.; Santillan, R.; Castillo, D. X-ray crystallographic study of three (N?B)-
    borinates prepared from 8-hydroxyquinoline and 2-hydroxypyridine. Khim. Geterotsikl. Soedin. 1999. PDF
  111. Ortiz, A.; Farfán, N.; Höpfl, H.; Santillan, R.; Ochoa, M. E.; Gutiérrez, A. A new method for the preparation of
    unsymmetrical 1,4-substituted piperazine derivatives. Tetrahedron Asymmetry 1999, 10. PDF
  112. 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. PDF
  113. Farfán, N.; Höpfl, H. Crystal and molecular structure of [Hg3(H2pdm)2(Hpdm) (µ-Cl)2Cl3]. Heteroatom Chem.
    1998, 9. PDF
  114. Höpfl, H.; Farfán, N. Synthesis and structural characterization of (2'- hydroxyacetophenoneazine)mono
    (diphenylboron) chelate. Can. J. Chem. 1998, 76. PDF
  115. Höpfl, H.; Hernández, N. P.; Líma, S. R.; Santillan, R.; Farfán, N. X-ray crystallographic study of neutral boron
    chelates with ß-diketones and tropolone. Heteroatom Chem. 1998, 9. PDF
  116. Höpfl, H.; Sánchez, M.; Barba, V.; Farfán, N.; Rojas, S.; Santillan, R. Synthesis and Study of Monomeric and
    Dimeric Boronates by Spectroscopic Methods and X-ray Crystallography. Inorg. Chem. 1998, 37. PDF
  117. Höpfl, H.; Galván, M.; Farfán, N.; Santillan, R. Ab initio study of substituted 2-aminoethylborinates. J. Mol. Struct.
    THEOCHEM 1998, 427. PDF
  118. Höpfl, H.; Sánchez, M.; Farfán, N.; Barba, V. Synthesis and comparative study of throe monomeric boronates by
    spectroscopic methods and X-ray crystallography. Can. J. Chem. 1998, 76. PDF
  119. Höpfl, H.; Farfán, N.; Castillo, D.; Santillan, R.; Gutierrez, A.; Daran, J.-C. Study of cyclic borinates obtained from
    piperidine- and piperazine alcohols by spectroscopic methods and X-ray crystallography. J. Organomet. Chem. 1998,
    553. PDF
  120. Martínez-Martínez, F. J.; Padilla-Martínez, I. I.; Brito, M. A.; Geniz, E. D.; Rojas, R. C.; Saavedra, J. B. R.; Höpfl,
    H.; Tlahuextl, M.; Contreras, R. Three-center intramolecular hydrogen bonding in oxamide derivatives. NMR and X-
    ray diffraction study. Journal of the Chemical Society. Perkin Transactions 2 1998. PDF
  121. Ortíz, A.; Carrasco, J.; Höpfl, H.; Santillan, R.; Farfán, N. One step syntheses of heteropropellanes. Synth. Commun.
    1998, 28. PDF
  122. Santillan, R.; Farfán, N.; Castillo, D.; Gutiérrez, A.; Höpfl, H. 13C NMR and crystallographic study of
    thymolsulfonephthalein. Chem. Eur. J. 1998, 4. PDF
  123. Trujillo, J.; Höpfl, H.; Castillo, D.; Santillan, R.; Farfán, N. X-ray crystallographic study of boroxazolidones obtained
    from L-ornithine, L-methionine, kainic acid and 2,6-pyridinedicarboxylic acid. J. Organomet. Chem. 1998, 571. PDF
  124. Höpfl, H.; Farfán, N.; Castillo, D.; Santillan, R.; Contreras, R.; Martínez-Martínez, F. J.; Galván, M.; Alvarez, R.;
    Fernández, L.; Halut, S.; Daran, J.-C. Dynamic NMR and X-ray diffraction study of (N-B)-diphenyl(2-aminoethoxy)
    borane derivatives of ephedrines and pseudoephedrines. J. Organomet. Chem. 1997, 544. PDF
  125. Höpfl, H.; Farfán, N. New macrocyclic oligoboronates. J. Organomet. Chem. 1997, 547. PDF
  126. López-Sandoval, H. C.; Barba-Behrens, N.; Bernès, S.; Farfán-García, N.; Höpfl, H. Co-ordination behaviour of N-
    carboxymethylpseudoephedrine: Crystal structures of seven-co-ordinated cadmium(II) and fac-RS-octahedral copper
    (II) complexes. Journal of the Chemical Society - Dalton Transactions 1997. PDF
  127. Mancilla, T.; Höpfl, H.; Bravo, G.; Carrillo, L. Crystal and molecular structure of (N?B) phenyl [N-
    methyliminodiacetate-O,O',N] borane. Main Group Met. Chem. 1997, 20. PDF
  128. Balaban, A. T.; Haiduc, I.; Höpfl, H.; Farfán, N.; Santillan, R. Spiroborates revisited. X-ray crystal and molecular
    structures of boron chelate compounds with tropolone and 1,3-diketones. Main Group Met. Chem. 1996, 19. PDF