Phenyltrimethylammonium Tribromide for Selective Oxidation of Sulfides to Sulfoxides. A Convenient Synthesis of Sulfinyl-18O-Labelled Sulfoxide Carboxylic Acids
lengths range from 1.838(1) to 1.872(3) and from 1.771 (3) to 1.794(4)Å, respectively. The axial O–S–O and equatorial Car–S–Car bond angles lie in the narrow intervals of 174.9(2)–177.4(4)° and 105.8(2)–106.9(2)°, respectively. The five-membered spirorings are practically planar in 1–3. The six-membered spirorings in 2 and 4 assume distorted sofa conformations. The seven-membered spiroring in 3, having four
Phenyltrimethylammonium Tribromide for Selective Oxidation of Sulfides to Sulfoxides. A Convenient Synthesis of Sulfinyl-<sup>18</sup>O-Labelled Sulfoxide Carboxylic Acids
作者:József Rábai、István Kapovits、Béla Tanács、József Tamás
DOI:10.1055/s-1990-27033
日期:——
Various sulfides can be oxidized selectively to the corresponding sulfoxides in high yields using phenyltrimethylammonium tribromide in aqueous pyridine solution. This method allows 18O- labelled sulfoxides to be prepared with no loss of isotope enrichment of the (18O)water used.
Synthesis and hydrolysis of optically active naphthyl-phenyl-bis(acyloxy)spiro-λ4-sulfane: absolute configurations of spiro-λ4-sulfanes, related sulfonium salts and naphthyl phenyl sulfoxides determined by CD spectroscopy using exciton chirality and empirical rules
作者:Jenő Varga、József Rábai、Ferenc Ruff、Árpád Kucsman、Elemér Vass、Miklós Hollósi、Dénes Szabó
DOI:10.1016/j.tetasy.2003.09.011
日期:2003.11
(S)-(+)-naphthyl phenyl sulfoxide dicarboxylic acid 2a with acetic anhydride. The hydrolysis of spiro-λ4-sulfane (R)-(−)-2 in acidic and basic solutions gave as major products sulfoxide (S)-(+)-2a and (R)-(−)-2a, respectively. The selectivity of the reactions was interpreted with the different reactivities of the ortho and peri neighboring carboxylic groups of the sulfoxide 2a, and with the different