New Sterically Congested Organoselenium and Tellurium Compounds

Single-Crystal, Solid-State, and Solution 113Cd and 77Se NMR and X-ray Single-Crystal Study of a [Cd(SeR)2(N-donor)2] Complex

“…Synthesis of [Cd(Se-2,4,6- i -Pr 3 -C 6 H 2 ) 2 (bpy)] (1). Li(Se-2,4,6- i -Pr 3 -C 6 H 2 ) (0.578 g, 2 mmol) was generated by the addition 2.1 mL of LiHBEt 3 (obtained from Aldrich Chemicals) to a solution of 0.564 g of (2,4,6- i -Pr 3 -C 6 H 2 -Se) 2 in 10 mL of THF. The THF was removed and the lithium selenolate was redissolved in 20 mL of methanol.…”

Highly Electrophilic Intermediates in the Bypass Mechanism of Glutathione Peroxidase: Synthesis, Reactivity, and Structures of Selenocysteine‐Derived Cyclic Selenenyl Amides

“…[42] Similar to the Sec-SeOH form of GPx, the Sec-SeI form of Dio is proposed to be reduced to Sec-SeHs through a reaction with a thiol via the selenenyl sulfide form. Typically, selenenyl iodides easily undergo facile disproportionation to the corresponding diselenides and iodine, [43] but Sec-SeI 5 a [19] of the Sec-Gly-Gly model exhibited sufficient stability under standard laboratory conditions because of the steric protection by the Bpsc group. Here, Sec-SeI 5 a was selected as a reference compound for evaluating the electrophilic reactivity of 2 a.…”

Organic derivatives of monocoordinated tellurium

“…The stability of the esters 58 increases with increase in the size of the substituents R and R H . For example, in the reaction of bis(acetyl) telluride with bis(trimethylsilyl) telluride, the mixture of alkenes 68a is formed in almost quantitative yield over a period of 30 min, whereas the reaction of bis(acetyl) telluride with bis[(dimethyl)isopropylsilyl] telluride giving rise to a mixture of the alkenes 68c is completed only over a period of 12 h. 58,61 Te-Silylated derivatives 67 are the precursors of the esters 58; they either completely isomerise into O-silylated esters 58 (for R = Ar 52 ) or exist as equilibrium mixtures with them. Thus the reaction of pivaloyl chloride with silyl telluride 66 (R 1 = Me) affords an equilibrium mixture of the compounds 67b (35%) and 58b (65%), 60 as indicated by the spectral parameters of the blue liquid formed in this reaction (l max = 624 nm 58,60 ).…”