A new synthesis for symmetrical and unsymmetrical photoconductive squaraines, based on a (2 + 2) cycloaddition, reductive-alkylation and condensation reaction sequence, is described.
K. Law and F. C. Bailey, J. Chem. Soc., Chem. Commun., 1991, 1156 DOI: 10.1039/C39910001156
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