Phenyltrimethylammonium Tribromide for Selective Oxidation of Sulfides to Sulfoxides. A Convenient Synthesis of Sulfinyl-18O-Labelled Sulfoxide Carboxylic Acids
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.
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