Syntheses and Properties of Tetrakis(pentafluorophenyl)tellurium, Te(C6F5)4, and Related Compounds — Single Crystal Structures of Tris(pentafluorophenyl)tellurium Bromide, Te(C6F5)3Br, Tris(pentafluorophenyl)tellurium Trifluoromethanesulfonate, [Te(C6F5)3][OSO2CF3], and Bis(pentafluorophenyl)tellurium Oxide, Te(C6F5)2O

Synthesis and Structures of Cycloalkanetellurium(IV) Fluorides and Azides

“…The difluoride crystallizes in colorless blocks in the orthorhombic system, space group P2 1 2 1 2, with Z = 2. The five-membered ring adopts a half-chair conformation, which is also present in the structures of the lighter dihalides (CH 2 ) 4 TeX 2 (X = Cl, Br [20]). The molecules are located on twofold rotation axes passing through the tellurium atom and exist as infinite chains with secondary Te···F contacts.…”

“…Compounds of the formula R 2 Te(N 3 ) 2 , respectively RTe(N 3 ) 3 , with various organic alkyl, aryl or fluorinated substituents were synthesized a few years ago. Binary tellurium(IV) azides, Te(N 3 ) 4 , Te(N 3 ) 5 − and Te(N 3 ) 6 2− , have been prepared and could be isolated as well [11,12]. In this contribution we decided to investigate the chemistry of cyclic tellurium(IV) fluorides and azides.…”

Crystal structure of tris(triphenyltelluronium) fluoride tetrafluoroborate hemi(hexafluorosilicate) chloroform trisolvate, [Te(C6H5)3]3[F][BF4][SiF6]0.5 · 3 CHCl3

“…In the 1970 sZ iolo reported on the first telluronium pseudohalides [(C 6 H 5 ) 3 Te]X ( X =N 3 ,C N, OCN, SCN, SeCN) [3,4]. The preparation and characterization of non-ionic tris(perfluorophenyl)tellurium(IV) halogenides ( R F ) 3 TeCl and ( R F ) 3 TeBr ( R F =C 6 F 5 ,4-CF 3 C 6 F 4 )was achieved recently [5,6], and also trimethyltelluronium and selenonium pseudohalides have been thoroughly investigated [7,8]. Telluronium halides and -pseudohalides bearing non-fluorinated substituents are in most cases widely ionic and show strong electrolyte behavior in solution [9,10].…”

“…All volatile material is then pumped off in vacuo. Slow recrystallization from CHCl 3 / n -hexane in aglass vessel yielded [Ph 3 Te] 3 [F] [BF 4 ][SiF 6 ] 0.5 ·3CHCl 3 as colorless crystals.…”

Synthetic Approaches to Fluoroalkyltelluryl‐Substituted Compounds

“…However, even if good yields are claimed, no values are clearly mentioned (Scheme 25). [34] EurJOC Perfluoroaryllithium reagents are easy to access and can be used as nucleophilic reagents. Thus, they can react with tellurium tetrachloride to provide corresponding bis(perfluoroaryl)telluride.…”