A rigid trigonal‐bipyramidal arrangement of substituents and consequently a rigid CS bond are found in thione 2 at temperatures up to 180 °C. Compound 2 does not occur in the resonance‐stabilized ylide‐type resonance structure with an aromatic five‐membered ring. It is formed by elimination of HF from cyclopentadiene 1, the anion of which should display a diverse coordination chemistry.
P7, u =11.103i4). b = 3042(2)A3, Z = 1 , p=7.5mm-'. T=-lOO"C. Eine farblose Tafel 0.6 x 0.2 x 0.05 mm wurde in Inertol (Typ RS3000. Geschenk der Fa. Riedel de Haen) montiert. Auf einem Siemens-R3-Diffraktometer wurden 13 478 Reflexe (Mo,,-Strahlung. 20,,, = 50') gemessen, davon nach einer Absorptionskorrektur 10742 unabhdngig (R,,, 0.044). 10711 fur alle Berechnungen verwendet (Programm SHELXL-92). Die Struktur wurde mit der Schweratom-Methode gelosl und auf F Z verfeinert (Au, P. Cl und 0 anisotrop, Phenylringe idealiic) VCH Verlamzesellschuft mbH, D-hY45l Wrmhmn 1954 0044-6245:94:0~01-0098 5 10 O O t 2510
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