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A new highly reactive nonacarbon chain carboxonium salt 1 was synthesized. It leads, by action of various amines and hydrazone, to a new class of symmetrical nonacarbon chain streptocyanine dyes 3−5. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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Izquierdo et al. (2004) studied this question.
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