Amdr. Gonsalves et al., NEW PROCEDURES FOR THE SYNTHESIS AND ANALYSIS OF 5,10,15,20-TETRAKIS(SULPHOPHENYL)PORPHYRINS AND DERIVATIVES THROUGH CHLOROSULPHONATION, Heterocycles, 43(4), 1996, pp. 829-838
Tetrakisarylporphyrins are conveniently chlorosulphonated in high yiel
ds. These chlorosulphonyl compounds may be converted in high yield int
o sulphonic acid derivatives through reaction with a variety of nucleo
philes so as to give, for example, the free sulphonic acid, a sulphona
mide or a sulphonate ester.