N-Alkyl-3,4-perylenedicarboximides (alkyl=methyl, ethyl, propyl, butyl, isobutyl, pentyl, hexyl, and octyl) were prepared by the decarboxylation of N-alkyl-3,4:9,10-perylenetetracarboxylic monoanhydride monoimides (same alkyls) in potassium hydroxide solution.
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Nagao et al. (1981) studied this question.