Metallderivate von Molekülverbindungen. IV. Synthese, Struktur und Reaktivität des Lithium‐[tris‐(trimethylsilyl)silyl]tellanids · DME

Abstract

Lithium‐tris(trimethylsilyl)silanid · 1,5 DME [3] reagiert mit Tellur in 1,2‐Dimethoxyethan zu farblosem Lithium‐[tris(trimethylsilyl)silyi]tellanid · DME (1). Nach der Röntgenstrukturanalyse {‐150 ± 3°C; P21/c; a = 1346,6(4); b = 1497,0(4); c = 1274,5(3) pm; β = 99,22(2)°; Z = 2 Dimere; R = 0,030} ist Verbindung 1 im Festkörper dimer; die beiden Tris(trimethylsilyl)silyl‐Gruppen sind am planaren LiTeLiTe‐Ring trans‐ständig zueinander angeordnet. Tellur erreicht durch Bindung an zwei Lithium und ein Silicium die Koordinationszahl 3, Lithium durch Bindung an zwei Tellur und den Chelatliganden DME die Koordinationszahl 4 {LiTe 278 und 284; SiTe 250; LiO 200 pm (2X); TeLiTe 105°, LiTeLi 75°; OLiO 84°}. Der hier zu 154 pm ermittelte kovalente Radius des DME‐komplexierten Lithiumatoms fällt in den auch für andere Verbindungen typischen Bereich von 155 ± 3 pm. Charakteristische Umsetzungen des Tellanids 1 führen zu [Tris(trimethylsilyl)silyl]tellan (2), Methyl‐[tris(trimethylsilyl)silyl]tellan (4) und Bis[tris(trimethylsilyl)silyl]ditellan (5).

Lithium Alkylselenolates and -tellurolates − A Solid-State and Solution Structural Study

“…[10] and 2.122(2) Å in [CpFe{C 5 H 3 -(CH 2 NMe 2 )TeLi·DME}]. [15] The LiϪTeϪLi bond angles [both of which are 68.2(2)°] are more acute than those observed [75.1(1)°] in the only other dimeric lithium tellurolate [(DME)LiTeSi(SiMe 3 ) 3 ] 2 , [9] and the mean CϪTeϪLi bond angle in 2 is 95.0°[range 93.5(2) to 97.2(2)°].…”

Synthesis and reactions of organic compounds containing bonds of Te to Group 14 elements

“…30 Methyl tris(trimethylsilyl)silyl telluride (1s) was synthesised by treatment of lithium tris(trimethylsilyl)silanetellurolate with trimethyltelluronium iodide. 31 Photolysis of a hexabutyldistannane ± dimethyl telluride mixture yields methyl tributylstannyl telluride (1t). 32 2.…”

Stable tellurols and their metal derivatives

“…Sterically hindered tris(trimethylsilyl)silanetellurol (4b) was synthesised by protonolysis of lithium salts 5a 17 ± 19 or 5b 20 with trifluoroacetic acid in hexane 17 ± 19 or with HCl in toluene. 20 The salts 5a 21 and 5b 22 were prepared according to a standard procedure for the synthesis of these salts, which involves the insertion of the Te atom at the Si7Li bond in the complexes of tris(trimethylsilyl)silyllithium with THF (6a ) 21 or with dimethoxyethane (DME) (6b). 22 Colourless crystalline tellurol 4b is stable under an argon atmosphere in the dark for at least several days.…”