Aromatic ethers, such as anisole or phenetole, were cleaved smoothly with methanesulphonic acid in the presence of methionine, which acted as an alkyl acceptor to form methionine S-methyl (or ethyl)sulphonium salt.
H. Irie, N. Fujii, H. Ogawa, H. Yajima, M. Fujino and S. Shinagawa, J. Chem. Soc., Chem. Commun., 1976, 922 DOI: 10.1039/C39760000922
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