Pregunta 2 · Química I URV 2019
Tema: Estereoquímica i representació de molècules orgàniques · Del examen Examen Química I - Diciembre 2019 (2019)
Enunciado
Pregunta 2 (1.5 points). Stereochemistry and 3D Representations
Which of the following pairs of structures represent the same compound, and which represent different stereoisomers? Use suitable three-dimensional representations to justify your answers.
a)
b)
c)
Solución
Según los criterios oficiales de corrección
a) Which of the following pairs of structures represent the same compound, and which represent different stereoisomers?
Solución: Same compound.
Justification for pair a)
Solución: (2S, 3R) for both structures / Same configurations at C2 and C3
b) Which of the following pairs of structures represent the same compound, and which represent different stereoisomers?
Solución: Same compound.
Justification for pair b)
Solución: (2R, 3S) for both structures / Identical configurations
c) Which of the following pairs of structures represent the same compound, and which represent different stereoisomers?
Solución: Different stereoisomers (Diastereomers).
Justification for pair c)
Solución: (2R, 3S) vs (2S, 3S) / Inversion at one stereocenter / Diastereomers
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