Rearrangements of sulfoxides and sulfones in the total synthesis of natural compounds

Abstract

AbsbaCL An alomcdly ordered PdCu&o.p hydride was spthesizcd at 600 K and a hydxogcn p m s m of 3 GPa Irs Netd lanice had B primitive temgonal cell fomcd from the initial K c cell of thc disordcred PdCu alloy due to ordcrbg of the Pd and Cu atoms into allemve la)cn perpendicul;lr to the tetragonal c-ais. Rietveld refinemcat of Ihe neumn diffraction pallem of P d C u b 9 m a u r e d ai 80 K showcd thc H ~o m s to occupy octahedral interstitials within thc Pd layers. The inclastic neumu scanering sNdy at 35 K revealed a broad hydrogen o p i d peak with pcculivlties at energy m s f c n of 79 and 95 meV and of I13 meV uhich wcre zcribed to the H vibrations in the P d H planes and dong thc CU-H chains perpendiculv to the planer, respectively. The paantid for hydmgen *OM in the PdCK+9 ordered phase was thus noticeably diffcrenc even in the Pd-H plane, from that in the h o u n hydrides of pdhdium and palladium alloys. The value of approximly 116 meV was predicted forthc l o d H vibntions in dilute Cu-H solid solutions. E G 1991 Physica B 174 25741 Sov. Phys.-Solid State 33 87-90 Calcu&fions: User Manual (IFF KFA, Jiilich) Jiil-Spa-366 Rev. B 36 8798-801 A I, Bashkin IO, Sinicyn V V and Ponyatovskii E G 1989 Physlca C 162-164 1369-70 Belushkin A V 1993 Phys. Solid Srate 35 99-103

Synthesis of Symmetrical Sulfones from Rongalite: Expansion to Cyclic Sulfones by Ring‐Closing Metathesis

“…[1] Fused or 3-substituted sulfolenes are a latent source of conjugated dienes. Therefore, they are useful partners in Diels-Alder reactions for the synthesis of complex synthetic targets containing six-membered rings.…”

A new supramolecular zinc(II) complex containing 4‐biphenylcarbaldehyde isonicotinoylhydrazone ligand: Nanostructure synthesis, catalytic activities and Hirshfeld surface analysis

“…After that, the catalytic activity of complex for selective oxidation of sulfides to the corresponding sulfoxides was studied, because sulfoxides are applied as catalysts, reagents, final products and especially as synthetic intermediates in the synthesis of biological and medicinal materials. [44][45][46] Therefore, there is a great interest of researchers for selective oxidation of sulfides to the corresponding sulfoxides. [47][48][49][50] On the other hand, various oxidants such as selenium oxide (SeO 2 ), nitric acid, permanganates, hydrogen peroxide, and oxygen are used for the oxidation of sulfides.…”

A Novel Catalytic Method for the Oxidation of Sulfides to Sulfoxides with Silica Sulfuric Acid and Sodium Nitrite in the Presence of KBr and/or NaBr as Catalyst

“…[6][7][8] Sulfoxides are also valuable in C -C bond-formation 9,8 and molecular rearrangements. [10][11][12][13] Additionally some of biologically active sulfoxides play an important role as therapeutic agents such as anti-ulcer, [14][15][16] antibacterial, 17 antifungal, 7 anti-atherosclerotic reagents, 18,19 etc. Although sulfides can be easily oxidized by a wide variety of oxidizing agents, [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] and many of these methods still suffer from some drawbacks, including overoxidation to sulfones, low selectivity, low yields of products, tedious work-up, toxicity, and expensive reagents or catalysts.…”