Über das Naphthyl‐(2)‐tellurjodid

Abstract

Die Darstellung des Naphthyl-(2)-tellurjodids wird beschrieben und der Beweis fur seine Konstitution erbracht.uber die Klasse der Tellurenyl-Verbindungen finden sich in der Literatur nur wenige Publikationen2.3) ; diese beruhren das Thema der voriiegenden Arbeit jedoch nicht.Als wirmit dem Ziel, Naphthyl-(2)-tellurtrihalogenide zu gewinnendas Verhalten von Di-naphthyl-(2)-ditellurid gegeniiber Brom und Jod priiften, erhielten wir mit ersterem zwar das Naphthyl-(2)-tellurtribromid, mit Jod hingegen nur das Monohalogenid als ziemlich stabile, kristalline Verbindung.Um die Struktur dieses Halogenids aufzuklaren, wurde zunachst die alkalische Hydrolyse des Naphthyl-(2)-tellurtrichlorids und -tribromids, sodann diejenige des Monojodids untersucht. Aus den ersteren entsteht hierbei das Anhydrid I1 der Naphthyl-(2)-tellurinsaure in ubereinstimmung mit H. RHEINBOLDT und N. PETRA-G N A N I~) , die entsprechende Verbindungen auch bei der alkalischen Hydrolyse anderer Aryl-tellurtrihalogenide erhalten hatten. Das Monojodid liefert bei der alkalischen Hydrolyse Di-naphthyl-(2)-ditellurid (111) und das Anhydrid I1 der Naphthyl-(2)tellurinsaure in solchem Verhaltnis, daR die Hydrolyse in gleicher Weise wie bei den Selenenylhalogeniden 5,6) nach folgender Gleichung ablaufen diirfte :

Structures of Iodophenyltellurium(II) and Diiododi-(β-naphtyl)tellurium(IV)

“…Nevertheless, we were not able to isolate crystals of the tellurenyl halide suitable for an Xray analysis. The only crystalline compound we could obtain from the crude reaction product was the black [(b-naphtyl) 2 TeI 2 ] which slowly crystallized from the solution in low yields whereas the main product is an immediately formed insoluble black solid giving an elemental analysis which fits with a composition of (C 10 H 7 )TeI. The formation of a diaryldiiodotellurium(IV) has also been observed during our attempts to re-crystallise (PhTeI) 4 from hot toluene and is accompanied with the deposition of elemental tellurium (equ.…”

“…[(b-Naphtyl) 2 TeI 2 ] crystallises in the monoclinic space group C 2/c. The molecule possesses C 2 symmetry with the tellurium atom located on the twofold axis.…”

“…The aryltellurenyl iodides have been prepared at low temperatures from the corresponding diarylditellurides following the general procedure outlined in [2]. Single crystals of (PhTeI) 4 have been obtained from toluene solutions at 0°C.…”

“…The first aryltellurenyl halide with a sufficient stability, iodo-(b-naphtyltellurium(II), was reported in 1959 [2]. More representatives of this class of compounds have been prepared, bearing an ortho carbonyl, nitro or another electron-attracting group.…”

Synthesis, crystal structure and theoretical studies of aryltellurenyl tetramethylthiourea(tmtu) iodine complexes: Ph-Te(tmtu)I (1) and β-naphtyl-Te(tmtu)I (2)

“…We have a special interest in the chemistry of aryltellurium(II) halide compounds [1,2]. Their synthesis has been performed by the reaction between equivalent amounts of halogen and the corresponding ditelluride [3][4][5][6] or by ligand exchange with sodium iodide [7]. Generally, aryltellurenyl halides are reactive compounds which can be stabilized by complexation with external ligands (L ¼ thioureas, selenoureas, triphenyl-phosphine) giving neutral tellurium(II) complexes of the [RTe(L)X] type with threefold co-ordinated tellurium atoms [8][9][10][11], by formation of anionic [RTeXY] À species through addition of a second halide [12], or by chelation with donor groups already incorporated in the molecule [13][14][15][16][17][18].…”