Graphite/Methanesulfonic Acid (GMA) as a New Reagent for Sulfonylation of Phenols and Thia-Fries Rearrangement of Aryl Sulfonates to Sulfonylphenols

doi:10.1002/HLCA.200490295

Paper

Graphite/Methanesulfonic Acid (GMA) as a New Reagent for Sulfonylation of Phenols and Thia-Fries Rearrangement of Aryl Sulfonates to Sulfonylphenols

Published 2005 · H. Sharghi, Z. Shahsavari-Fard

Helvetica Chimica Acta

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Abstract

A new facile method for direct sulfonylation of phenols was developed. Graphite in methanesulfonic acid (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-Fries rearrangement of aryl sulfonates (Table 4). Mechanistic studies showed that the sulfonylation reaction of phenols in GMA occurred through an initial sulfonate formation followed by a thia-Fries rearrangement of the aryl sulfonate by an intermolecular mechanism (Scheme 3).

Study Snapshot

Graphite in methanesulfonic acid (GMA) provides a new facile method for direct sulfonylation of phenols and aryl sulfonates to sulfonylphenols, offering potential applications in organic synthesis and pharmaceuticals.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Paper

Graphite/Methanesulfonic Acid (GMA) as a New Reagent for Sulfonylation of Phenols and Thia-Fries Rearrangement of Aryl Sulfonates to Sulfonylphenols

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