86119-80-4

Upstream product

• 603-35-0 triphenylphosphine 
• 2065-67-0 tetraphenylphosphonium iodide 
• 1237512-24-1 C₁₀H₂₂O⁽¹⁷⁾OSi 
• 1237512-23-0 C₇H₁₄O⁽¹⁷⁾O 

Relevant academic research and scientific papers

EPR Spectroscopic Characterization of a Jahn-Teller Distorted (C3v→Cs) Four-Coordinate Chromium(V) Oxo Species

Metal-oxo coordination compounds have garnered significant interest over the years. The reactivity of the metal-oxo bond is governed by the geometry, charge, spin state, and identity of the other ligands. In this report, we characterize a distorted C3v-symmetric CrV-oxo complex that has unique magnetic properties, compared with all other known chromyl species. Continuous wave and pulse electron paramagnetic resonance were used to measure the molecular g-values and 53Cr and 17O hyperfine interactions. Analysis of density functional theory results and the g and hyperfine tensors, in the context of a crystallographically observed Jahn-Teller distortion, suggests an electronic structure that results from the mixing of two sets of doubly degenerate orbital states. This mixing is only made possible by the approximate three-fold symmetry of the ligand set.

Chalcogen-Bonding Catalysis with Telluronium Cations

Chalcogen bonding results from non-covalent interactions occurring between electrodeficient chalcogen atoms and Lewis bases. Among the chalcogens, tellurium is the strongest Lewis acid, but Te-based compounds are scarcely used as organocatalysts. For the first time, telluronium cations demonstrated impressive catalytic properties at low loadings in three benchmark reactions: the Friedel–Crafts bromination of anisole, the bromolactonization of ω-unsaturated carboxylic acids and the aza-Diels–Alder between Danishefsky's diene and imines. The ability of telluronium cations to interact with a Lewis base through chalcogen bonding was demonstrated on the basis of multi-nuclear (17O, 31P, and 125Te) NMR analysis and DFT calculations.

Phosphine-catalyzed reductions of alkyl silyl peroxides by titanium hydride reducing agents: Development of the method and mechanistic investigations

(Figure presented) A method that allows for the reduction of protected hydroperoxides by employing catalytic amounts of phosphine is presented. The combination of a titanium(IV) alkoxide and a siloxane allowed for the chemoselective reduction of phosphine oxides in the presence of alkyl silyl peroxides. Subsequent reduction of the peroxide moiety by phosphine provided the corresponding silylated alcohols in useful yields. Mechanistic experiments, including crossover experiments, support a mechanism in which the peroxide group was reduced and the silyl group was transferred in a concerted step. Labeling studies with 17O-labeled peroxides demonstrate that the oxygen atom adjacent to the silicon atom is removed from the silyl peroxide.

Comparative study of the phospha- and arsa-Wittig reaction using 1H, 75As and 17O NMR spectroscopy

The existence of oxaarsetanes during an arsa-Wittig reaction has been proved by 1H and 17O NMR spectroscopy. 75As NMR spectra were obtained from the corresponding arsonium salts and arsane oxides. The dynamic 1H NMR spectra of phospha- and arsaylides were compared. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.