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Low temperatures and low pressures suffice for the sulfonation of methane with a suitable free-radical initiator and promoter [Eq. (1)]. Since the RhCl3 promoter can be recycled, and the initiator complex is stable and easy to handle, development of this reaction into an industrial process is promising. MSA=methanesulfonic acid.
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Mukhopadhyay et al. (2003) studied this question.
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