An unexpected tetrahydrofuran ring opening: synthesis and structural characterization of Ph3PO(CH2)4TeBr4

Cooperative THF Ring‐Opening by B(C6F5)3 and a Tellurium Diimide Dimer

“…By analogy with transition-metal systems, [10] it is proposed that coordination of the THF oxygen atom to the electrophilic boron centre polarizes the CϪO bond so that the α-carbon atom is susceptible to nucleophilic attack. As a result, and in contrast to the THF ring-opening mode observed for PPh 3 /TeBr 4 , [12] the carbon atom of the THF fragment is bonded to the nucleophilic centre in 3.…”

“…Complex 2 is also generated when 1 is added to a THF solution of B(C 6 F 5 ) 3 . Although various transition-metal and uranium complexes promote THF ring-opening, [10] main-group element Lewis acids are rarely involved [11,12] and, to the best of our knowledge, this is the first example involving B(C 6 F 5 ) 3 .…”

Coordination chemistry of the main group elements with phosphine, arsine and stibine ligands

“…Selenium(IV) and tellurium(IV) halides are reduced by phosphines; the complex mixture of products formed depends upon the reaction conditions, but the primary reaction is the formation of halophosphorus(V) cations [PR 3 X] + and selenium or tellurium anions, sometimes along with elemental Se or Te [344][345][346]. In the presence of air and moisture, the major products with TeX 4 are protonated phosphine oxide salts of halotellurates(IV) [346].…”

Tetrabromido[4-(triphenylphosphanyloxy)butyl]tellurium acetonitrile monosolvate

“…For the formation of Ph 3 PO(CH 2 ) 4 TeBr 4 and the structure of the dichloromethane monosolvate, see: Kunnari et al (2001). For TeÁ Á ÁN interactions, see: Cozzolino et al (2011); Pauling (1960).…”