Al<sub>2</sub>O<sub>3</sub>/MeSO<sub>3</sub>H (AMA) as a New Reagent for the Thia-Fries Rearrangement of Arylsulfonates to Hydroxyaryl Sulfones
作者:Hashem Sharghi、Zahra Shahsavari-Fard
DOI:10.1080/104265090929878
日期:2005.11.1
A new facile method for this-Fries rearrangement of arylsulfonates has been developed. A variety of arylsulfonates rearrange in excellent yields in the presence of Al2O3/MeSO3H as a new reagent without the use of any solvent.
US4554381A
申请人:——
公开号:US4554381A
公开(公告)日:1985-11-19
Graphite/Methanesulfonic Acid (GMA) as a New Reagent for Sulfonylation of Phenols and Thia-Fries Rearrangement of Aryl Sulfonates to Sulfonylphenols
作者:Hashem Sharghi、Zahra Shahsavari-Fard
DOI:10.1002/hlca.200490295
日期:2005.1
A new facile method for direct sulfonylation of phenols was developed. Graphite in methanesulfonicacid (GMA) was used to prepare sulfonylphenols by sulfonylation of phenol and naphthalene derivatives with p-toluenesulfonic acid (=4-methylbenzenesulfonic acid) (Table 1) and the thia-Friesrearrangement of arylsulfonates (Table 4). Mechanistic studies showed that the sulfonylation reaction of phenols
A process for sulfonylation of halobenzenes, in which a halobenzene is reacted with a sulfonic acid, a precursor or a derivative thereof in the presence of boron trifluoride in an amount such that the absolute pressure of boron trifluoride within the reaction vessel exceeds 1 bar, and in the presence of hydrofluoric acid as a solvent. The resultant products are useful as intermediates in the synthesis of compounds having a phytosanitary (e.g., herbicidal) or pharmaceutical activity.