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2005
Sulfones
Q 0600
25- 082
Graphite/Methanesulfonic Acid (GMA) as a New Reagent for Sulfonylation of
Phenols and Thia-Fries Rearrangement of Aryl Sulfonates to Sulfonylphenols.
— Direct sulfonation of phenols (I), (VI) and (IX) with toluenesulfonic acid (II) is
smoothly achieved in the presence of graphite—methanesulfonic acid at 120 °C.
Studies on the reaction mechanism reveal that the sulfonylation proceeds via thia-Fries
rearrangement of intermediary formed aryl sulfonates (V), (VIII) and (XI), respectively. — (SHARGHI*, H.; SHAHSAVARI-FARD, Z.; Helv. Chim. Acta 88 (2005) 1,
42-52; Dep. Chem., Coll. Sci., Shiraz Univ., Shiraz 71454, Iran; Eng.) — Mischke
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