The ratio, resolution and photophysical characterization of atropisomers of 5,10,15,20-tetrakis(2,6-dichloro-3-N-butylsulfamoylphenyl)porphyrin, 5,10,15,20-tetrakis(2,6-dichloro-3-(N-1-(L)-ethoxycarbonyl-2-methyl-propyl-sulfamoyl)phenyl)porphyrin and 5,10,15,20-tetrakis(2,6-dichloro-3-(N-1-(L)-methoxycarbonyl-3-methyl-butyl-sulfamoyl)phenyl)porphyrin are reported.
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Ressurreição et al. (2007) studied this question.