Determinacion de la configuracion E-Z de los acidos fumarico y maleico. Un experimento orientado a incentivar el desarrollo de la investigacion cientifica en alumnos de pregrado

Carlos Bustos, Guillermo Salgado, Rolando Martínez, François Carrière

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

1 Cita (Scopus)

Resumen

In this work we intend to eliminate the idea that laboratory exercises seem like cookbooks. That is, exercises shall be presented as a problematic situation. Based on observation and experimentation, the students should determine the E-Z configuration of maleic and fumaric acids. The basis of this laboratory exercise is the acid-catalyzed isomerization of maleic acid to fumaric acid. Students are given the starting material, reagents and the experimental procedure. They are told that the starting material is a dicarboxylic acid containing a C=C double bond of formula C4H4O4. Students determine melting points, solubilities, acidity and chromatographic patterns for both the starting material and the product, so that a configuration of each acid can be proposed. This type of experiment yields excellent results, because the students are left to deduce that maleic acid is less stable than fumaric acid. Additionally, they conclude that maleic acid is the "Z" isomer and fumaric acid is the "E" isomer. Finally, this laboratory exercise allows the students to develop simultaneously their critical-thinking skills with the respective laboratory techniques and not to see chemistry as recipes to be followed.

Título traducido de la contribuciónDetermination of the E-Z fumaric and maleic acids configuration. An experiment designed to develop scientific research abilities in undergraduates students
Idioma originalPortugués
Páginas (desde-hasta)568-570
Número de páginas3
PublicaciónQuimica Nova
Volumen23
N.º4
DOI
EstadoPublicada - 2000

Palabras clave

  • Chemical education
  • Demonstration experiments
  • Stereochemistry

Áreas temáticas de ASJC Scopus

  • Química (todo)

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