51786-98-2Relevant articles and documents
Synthesis, Infrared and X-Ray Studies of Diphenyltellurium(IV) Nitrosocarbamylcyanmethanides. X-Ray Evidence for Stability of a Tritelluroxane Fragment -Ph2Te-O-Ph2Te-O-Ph2Te-
Domasevitch, Konstantin V.,Skopenko, Victor V.,Rusanov, Eduard B.
, p. 832 - 837 (1996)
Diphenyltellurium(IV) derivatives of the types Ph2Te{ACO}2 (1), Ph4Te2O{ACO}2 (2) and Ph6Te3O2{ACO}2 (3) (ACO = nitrosocarbamylcyanmethanide -ONC
SOLUTION STUDIES OF TRIORGANOTELLURONIUM SALTS
Dance, Nigel S.,Mcwhinnie, William R.,Mallaki, Jahangir,Monsef-Mirzai, Zahra
, p. 131 - 144 (1980)
Evidence for telluronium ylid formation via the salt method is obtained for Ph2Te(CH2COPh)Br, but generally telluronium salts (aryl)2Te(CH2R)X rapidly dissociate in chloroform solution to (aryl)2Te and RCH2X.The relative rates of dissociation of Ph2(CH3)TeX in CHCl3 are: X=I > Br ca.NCS > Cl > PhCOO.Conductivity and 1H NMR data suggest the salts Ph2(CH3)TeX to be covalent and at least dimeric in CHCl3, but more ionic in DMSO and, to a lesser extent, DMF.IR data indicate association in solid Ph2(CH3)TeI.Kinetic data show that the reaction of CH3I with excess Ph2Te (solvent) affords an equilibrium mixture of ionic and covalent forms of Ph2(CH3)TeI, the ionic species being formed via the covalent one.Spin trapping experiments with phenyl(t-butyl)nitrone indicate that oxidative addition of alkyl halides to Ph2Te and reductive elimination of CH3SCN from Ph2(CH3)Te(NCS) proceed via radical pathways.A mechanism is proposed for oxidative addition which involves the preformation of a charge transfer complex of RX (alkyl halide) and diphenyltelluride.
Photosensitized oxygenation of diaryl tellurides to telluroxides and their oxidizing properties
Oba, Makoto,Endo, Masaki,Nishiyama, Kozaburo,Ouchi, Akihiko,Ando, Wataru
, p. 1672 - 1673 (2007/10/03)
Photosensitized oxidation of tellurides carrying bulky aromatic substituents afforded the corresponding telluroxides which were found to react with simple alcohols to give the corresponding carbonyl compounds in excellent yields along with the starting tellurides.
A Mechanism for the Oxidation of Glutathione to Glutathione Disulfide with Organotellurium(IV) and Organoselenium(IV) Compounds. A Stepwise Process with Implications for Photodynamic Therapy and Other Oxidative Chemotherapy
Detty, Michael R.,Friedman, Alan E.,Oseroff, Alan R.
, p. 8245 - 8250 (2007/10/02)
The reactions of telluroxides or their hydrates 3-5 with glutathione to give telluropyrylium dyes 1,2 or diphenyl telluride, respectively, and glutathione disulfide have at least two discrete steps.A fast reaction, which is first-order in both substrate and glutathione, is observed with second-order rate constants of 2.30E7 L mol-1 s-1 at 285.4 K for 3, 1.66E7 L mol-1 s-1 at 293.2 K for 4, and 5.2E6 L mol-1 s-1 at 285.5 K for 5.This reaction is followed by a slower reaction, which is first-order in both substrate and glutathione, with second-order rate constants of 2.65E5 L mol-1 s-1 at 293.5 K for 3, 3.34E5 L mol-1 s-1 at 293.2 K for 4, and 7.64E3 L mol-1 s-1 at 285.5 K for 5.The slow reaction is accompanied by the generation of the corresponding tellurium(II) compound.Diphenyl selenoxide hydrate (6) displays similar behavior, although the rate constants associated with the fast (2.26E2 L mol-1 s-1) and slow (6.62E1 L mol-1 s-1) reactions are many orders-of-magnitude less than observed for the tellurium analogues.
