Regioselective bromination of 2-nitro-5,10,15,20-tetraphenylporphyrin, cyclopropa[b]chlorins, or trans-bis(dicyanomethyl)chlorins occurs in the pyrrole subunit opposite the substituted ring; exhaustive bromination of functionalized tetraphenylchlorins provides a route to dodecasubstitued dihydroporphyrins for the first time.
K. M. Shea and L. Jaquinod, Chem. Commun., 1998, 759 DOI: 10.1039/A708766G
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