Abstract
The molecular and crystal structures of the two racemic diastereomeric 3,4-dihydropyrromethenone derivatives1 and2 of configurations (Z) and (E) were determined at 93 K (1, 2) and at room temperature (1). From an analysis of the crystallographically observed temperature coefficients a pseudorotation flexibility of the pyrrolidinone ring in the crystal is deduced. In both compounds a nearly orthogonal arrangement between the two heterocyclic ring systems is observed, which is ascribed to the steric bulk of the substituents in positions 1 and 3 of the pyrrolidinone ring.
Zusammenfassung
Die Molekül- und Kristallstruktur der beiden racemischen diastereomeren 3,4-Dihydropyrromethenonderivate1 und2 mit Konfigurationen (Z) und (E) wurden bei 93 K (1, 2) und bei Raumtemperatur (1) bestimmt. Aus einer Analyse der kristallographisch beobachteten Temperaturfaktoren wird auf eine Pseudorotations-Flexibilität des Pyrrolidinonringes im Kristall geschlossen. In beiden Verbindungen beobachtet man eine nahezu orthogonale Orientierung der beiden Fünfringe zueinander, die der Raumerfüllung der Substituenten in Positionen 1 und 3 des Pyrrolidinonringes zugeschrieben wird.
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Herrn Prof.Josef Schurz zum 60. Geburtstag gewidmet.
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Kratky, C., Falk, H. & Zrunek, U. The molecular and crystal structures of two diastereomeric 3,4-dihydropyrromethenones. Monatsh Chem 116, 607–623 (1985). https://doi.org/10.1007/BF00798786
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DOI: https://doi.org/10.1007/BF00798786