Journal
ORGANIC LETTERS
Volume 6, Issue 22, Pages 3965-3968Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol048411y
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[GRAPHICS] Condensation of squaric acid with quinaldinium salts containing electron-donating substituents gave only the semisquaraines. However, with salts possessing electronegative and electron-withdrawing groups, the squaraine dyes were isolated in quantitative yields. The semisquaraines formed undergo condensation with highly nucleophilic salts yielding the unsymmetrical squaraine dyes. These results demonstrate the role of electronic factors and provide valuable information for the design of efficient squaraine-based sensitizers that can have potential applications in photodynamic therapy.
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