title: 3-Ethynyl-2,2,5,5-tetra-methyl-1-oxyl-3-pyrroline.
abstract: The five-membered ring of the title compound, C(10)H(14)NO, is almost planar [mean deviation from best plane = 0.006 (1) Å]. The N-O bond is in the plane of the five-membered ring. The mol-ecule is positioned about a pseudo-mirror plane at y = 0.375. In the crystal, mol-ecules are connected by inter-molecular C-H⋯O contacts into layers parallel to (010).
authors.affiliation: Institut für Organische Chemie, Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany.
authors.forename: Olga
authors.initials: O
authors.lastname: Frolow
authors.forename: Jan W
authors.initials: JW
authors.lastname: Bats
authors.forename: Joachim W
authors.initials: JW
authors.lastname: Engels