Cyclotrimerization of 4,5‐bis(hexylthio)phthalodinitrile (1) in 1‐chloronaphthalene in the presence of BCl3 leads to the subphthalocyanine 4. Unsymmetrical phthalocyanines (5, 6) with six alkylthio substituents on three of the benzenoid units are synthesized by the reaction of 4 with an diiminoisoindoline derivative (R′ = H or NO2). These extremely soluble compounds are characterized by IR, 1H‐ and 13C‐NMR as well as UV/Vis spectra.
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Dabak et al. (1994) studied this question.
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