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Updated: Jun 1, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
1-[(E)-4-(5-Bromo-1H-indol-3-yl)-1-methyl-2,5,6,7-tetra-hydro-1H-azepin-2-yl-idene]propan-2-one
Abstract:
In the title compound, C(18)H(19)BrN(2)O, the seven-membered azepine ring adopts a twist-boat conformation: the bond angles about the azepine N atom are indicative of sp(2) hybridization. The dihedral angle between the plane of the carbon-carbon double bond of the enone unit and the mean plane of the indole ring is 27.8 (1)°. In the crystal, an N-H⋯O hydrogen bond links the mol-ecules into chains along the b axis.
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