Alkyl-, silyl-, and germyl-substituted thiolate, selenolate, and tellurolate derivatives and interconversion of silyl species by chalcogen metathesis

A Comparative Study of Chalcogenated Phosphanylborohydrides[EPR2BH3]– (R = Ph, tBu) and Triorganophosphane Chalcogenides EPPh2CH3 (E = O, S, Se, Te)

“…[34] 125 Te NMR spectra were referenced against external concentrated aqueous H 6 TeO 6 (δ = 712 ppm vs. Me 2 Te). [35] Abbreviations: s = singlet, d = doublet, q = quartet, dq = doublet of quartets, m = multiplet, n.r. = multiplet expected in the NMR spectrum but not resolved, i = ipso, o = ortho, m = meta, p = para.…”

Synthesis and Characterization of [Zn(SEt)Et]10, Formed via Insertion of Sulfur into Zn-C Bonds: A New Class of Wurtzite-like Cluster Framework

“…The insertion of sulfur into metal carbon bonds has recently been reported for the case of Grignard-type reagents, but has not been extensively studied for other metal carbon bonds. 1 The reaction of S 8 with transition metal complexes generally leads to the formation Characterization of the crystals isolated from this reaction by single-crystal X-ray diffraction revealed the molecular formula, ZnI 0 (SEt) 10 Etl 0 . The structure of this molecule is shown in Figure 2a and consists of three six-membered, chair conformation Zn-S rings each linked together through three Zn-S bonds with capping SEt and Zn-Et groups at each end respectively.…”

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

“…A similar result was obtained with a 0.030  solution of 2 (n ϭ 3.30 Ϯ 0.12). Despite this, 7 Li NMR spectroscopic studies at 25°C on THF solutions of 1 and 2 showed only one peak (δ ϭ Ϫ0.04 for a 0.023  solution of 1, and δ ϭ 0.25 for a 0.020  solution of 2, referenced to PhLi in THF) indicating that any fluxional behaviour between different aggregation states is rapid. This dynamic equilibrium was still observed down to temperatures as low as Ϫ80°C since even at these temperatures only one peak was visible by 7 Li NMR spectroscopy.…”

“…Despite this, 7 Li NMR spectroscopic studies at 25°C on THF solutions of 1 and 2 showed only one peak (δ ϭ Ϫ0.04 for a 0.023  solution of 1, and δ ϭ 0.25 for a 0.020  solution of 2, referenced to PhLi in THF) indicating that any fluxional behaviour between different aggregation states is rapid. This dynamic equilibrium was still observed down to temperatures as low as Ϫ80°C since even at these temperatures only one peak was visible by 7 Li NMR spectroscopy. The absence of any observable 7 Li coupling to either 77 Se or 125 Te in these spectra is also indicative of the fluxional behaviour of these species, since any change in aggregation state would involve the breaking and formation of LiϪX (X ϭ Se or Te) bonds.…”