Syntheses, Absolute Configurations, and UV/Vis Spectroscopic Properties of New Chiral Tri??and Pentamethinium Streptocyanine Dyes with 4??Aminophenyl 4?? …

C Reichardt, HP Erfurt, K Harms…

Index: Reichardt, Christian; Erfurt, Hans-Peter; Harms, Klaus; Schaefer, Gerhard European Journal of Organic Chemistry, 2002 , # 3 p. 439 - 452

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Citation Number: 2

Abstract

Abstract Starting with monochiral 4-aminophenyl 4-methylphenyl sulfoxides 3a and 3b, the absolute configurations of which were determined by X-ray analysis, we have synthesized the new chiral C 2-symmetrical tri-and pentamethinium streptocyanine dyes 5a and 5b and 7a and 7b with sulfinyl groups as stereogenic centers in the two endgroups. Deprotonation of the trimethinium dyes 5a and 5b gave the intramolecularly H-bonded neutral ...