Synonyms:bisulfite;H2S(D2S);hydrogen sulfite;hydrosulfite
99% *data from raw suppliers
The research focuses on the development of an efficient, green, and one-pot synthesis method for bis-indolyl and tris-indolyl methanes using poly(ethylene glycol)-bound sulfonic acid (PEG-SO3H) as a catalyst in aqueous media. The study explores the condensation of indole with a variety of structurally diverse aldehydes and ketones at room temperature, aiming to produce biologically active compounds with potential therapeutic importance. The experiments involved the use of PEG-SO3H as a catalyst, with reactions carried out in water, leading to good to excellent yields in shorter reaction times. The analyses used to characterize the synthesized compounds included melting point determination, infrared (IR) spectroscopy, liquid chromatography-mass spectrometry (LCMS), and nuclear magnetic resonance (NMR) spectroscopy, providing comprehensive data on the structure and purity of the products.
The research focuses on the structural elucidation of rhodium (Rh) complexes derived from RhCl(PPh3)3, immobilized on surface-functionalized SBA-15 silica, which is functionalized with primary amine, secondary amine, or diphenylphosphine groups. The study aims to understand the local structures of these immobilized Rh complexes and their catalytic performance in C-heteroatom (S, O) bond formation reactions, specifically hydrothiolation and hydrosulfonation. The experiments involved the preparation of immobilized Rh complexes through covalent bonding with different functional groups on the silica surface, which was characterized using a variety of techniques including XRD, HR-TEM, multinuclear solid-state NMR, XPS, and Rh K-edge EXAFS. The catalytic performance of these complexes was evaluated by adding alkynes with thiols and sulfonic acids under mild reaction conditions, with the focus on activity, regio- and stereoselectivity. The analyses used to determine the structure and performance of the catalysts included nitrogen adsorption isotherms, low-angle XRD, HR-TEM, solid-state NMR, XPS, and EXAFS, which collectively provided insights into the chemical environment and local structure of the surface-supported Rh complexes.
The research focuses on the synthesis and characterization of ruthenium and osmium sulphonate complexes, with the aim of exploring the potential of sulphonate anions as leaving groups in platinum metal ligand-substitution reactions. The study successfully prepared a series of new sulphonate complexes, including [M(O,SR),(H,O)(CO)(PPh,),] (M = Ru or Os) and [M(O,SR),(CO),(PPh,),], through reactions involving sulphonic acids with precursors such as [MH,(CO)(PPh,),] in refluxing benzene or toluene. The synthesized complexes were characterized using variable-temperature 'H and 31P-{1H} n.m.r. spectroscopy, which revealed fluxional behavior in solution, and X-ray diffraction methods, which determined the solid-state structures. The findings suggest that the M-O,SR bonds trans to CO are less labile than those trans to PPh, in these complexes. The chemicals used in the process include sulphonic acids (RSO,H with R = CH,, CF,, or C,H,CH,-p), carbonyldihydridotris(triphenylphosphine)-ruthenium and -osmium, tricarbonylbis(triphenylphosphine)ruthenium, dicarbonyldihydridobis(triphenylphosphine)osmium, and tetrahydridotris(triphenylphosphine)osmium, among others.
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