title: Progress in Polyarsolyl Chemistry.
abstract: The synthesis of heteroatom analogues of the cyclopentadienyl anion Cp-is a fascinating and challenging field of research. The replacement of methine moieties by phosphorus is well investigated for the synthesis of mono-, tri- and pentaphospholyl ligands. On the other hand, arsenic derivatives are rare and 1,2,4-triarsolyl and tetraarsolyl salts are unknown. Herein, we report on the synthesis of Cs[E3C2(trip)2] (1 a: E=P; 1 b: E=As; trip=2,4,6-triisopropylphenyl) and Cs[E4C(trip)] (2 a: E=P; 2 b: E=As). Compound 1 b represents the first 1,2,4-triarsolyl and 2 b the first tetraarsolyl anion. All salts are obtained in one-pot syntheses using E(SiMe3)3, 2,4,6-triisopropylbenzoyl chloride and CsF. The products 1 a⋅2 C4H8O2, 2 a⋅Et2O and 2 b⋅3 C4H8O2were characterized by X-ray structural analysis, which revealed planar heterocycles. Nucleus-independent chemical shifts (NICS) confirmed the aromaticity of these anions. Notably, compound 2 a⋅Et2O is only the second tetraphospholyl ligand which is structurally characterized.
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Heindl
authors.affiliation: Nikolaev Institute of Inorganic Chemistry, Siberian Division of RAS, Acad. Lavrentyev Str. 3, 630090, Novosibirsk, Russia.|Novosibirsk State University, Pirogova Str. 2, 630090, Novosibirsk, Russia.
authors.forename: Eugenia V
authors.initials: EV
authors.lastname: Peresypkina
authors.affiliation: Nikolaev Institute of Inorganic Chemistry, Siberian Division of RAS, Acad. Lavrentyev Str. 3, 630090, Novosibirsk, Russia.|Novosibirsk State University, Pirogova Str. 2, 630090, Novosibirsk, Russia.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Virovets
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.
authors.forename: Gábor
authors.initials: G
authors.lastname: Balázs
authors.affiliation: Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany. Manfred.Scheer@ur.de.
authors.forename: Manfred
authors.initials: M
authors.lastname: Scheer
keywords: cyclopentadienyl ligands; heterocycles; inorganic ring systems; polyarsolyl; polyphospholyl