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A New Record for Negative Solvatochromism
I. Bolz, D. Schaarschmidt, T. Rüffer, H. Lang, S. Spange*
Technische Universität Chemnitz, Germany
20 November 2009 (online)
The authors report the synthesis and properties of a pyridinium-barbiturate-betaine dye (3). After reacting diethylphenyl malonate and N-methyl urea they perform a nitration leading to 2. The following reaction with potassium formate followed by 2,4,6-triphenylpyrilium tetrafluoroborate yields the desired dye 3.