MNDO Molecular Orbital Analyses of Models for Proanthocyanidin-Methylolphenol Reactions

  • Fred L. Tobiason
  • Lori A. Hoff


The MNDO molecular orbital method has been applied to molecular structures that model or react with proanthocyanidins. Atom net charge distribution, structural parameters, heats of formation, and ionization potentials are evaluated for: (+)-catechin, (−)-epicatechin, catechol, resorcinol, phloroglucinol, o- and p-methylolphenol, and o-and p-benzoquinone methide in an investigation of chemical reactivity under different pH conditions. Other MO calculations are reviewed, and the optimized MNDO MO parameters are compared with existing literature data. The total net and HOMO electronic charge distribution is evaluated in terms of nucleophilicity and chemical reactivity. The HOMO frontier orbitals in polyhydroxybenzene and the LUMO orbitals in the benzoquinone methides play an important role in chemical reactivity.


Dipole Moment Charge Density Condensed Tannin Frontier Orbital Quinone Methide 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Fred L. Tobiason
    • 1
  • Lori A. Hoff
    • 1
  1. 1.Department of ChemistryPacific Lutheran UniversityTacomaUSA

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