Porphin and β-octaethylporphin are halogenated notably more easily than is benzene. With octaethylporphin, chlorosulphuric acid acts as a chlorinating, not a sulphonating agent, presumably for steric reasons.
E. Samuels, R. Shuttleworth and T. S. Stevens, J. Chem. Soc. C, 1968, 145 DOI: 10.1039/J39680000145
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