Thiation of N , N -biphthalimide in a search for new axially chiral ligands gave a mixture of oligothiobiphthalimides; X-ray crystallography shows that the achiral isomer of dithiodioxobiphthalimide, 1,3-dithioxo-1H-3H-[2,2 ' ]biisoindolyl-1 ' ,3 ' -dione is formed, which may imply a change in the mechanism of thiation between mono- and di-phthalimides.
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Coogan et al. (2002) studied this question.
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