2904100000 derivatives containing only sulpho groups, their salts and ethyl esters。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0%
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Aromatic isomerization reactions. Part III. Kinetics of the isomerization of the sulphonic acids of o- and m-xylene in aqueous sulphuric acid A. Koeberg-Telder,A. J. Prinsen,H. Cerfontain J. Chem. Soc. B 1969 1004
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Aromatic sulphonation. Part 92. Sulphonation of the three methylphenols and the six dimethylphenols in concentrated aqueous sulphuric acid; and the lsomerization of some of the resulting sulphonic acids and of m-xylene-2-and o-xylene-3-sulphonic acid Hans J. A. Lambrechts,Zwaan R. H. Schaasberg-Nienhuis,Hans Cerfontain J. Chem. Soc. Perkin Trans. 2 1985 669