Abstract
Fluorans are popular leuco dyes that are used in various applications, such as carbonless-copy papers and thermal papers. Here, we describe unique leuco dyes in which two fluoran units are fused into a C2h structure (iso-aminobenzopyranoxanthenes; iso-ABPXs). iso-ABPXs exhibited a large two-step color change (colorless/pink and pink/blue-green) due to opening-closing of two spirolactone rings. The two-step equilibrium among the colorless, pink, and blue-green forms could be well controlled by adjusting acid concentration, solvent, and/or temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 12046-12051 |
| Number of pages | 6 |
| Journal | Journal of Organic Chemistry |
| Volume | 81 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - Dec 2 2016 |
ASJC Scopus subject areas
- Organic Chemistry
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Shirasaki, Y., Okamoto, Y., Muranaka, A., Kamino, S., Sawada, D., Hashizume, D., & Uchiyama, M. (2016). Fused-Fluoran Leuco Dyes with Large Color-Change Derived from Two-Step Equilibrium: Iso-Aminobenzopyranoxanthenes. Journal of Organic Chemistry, 81(23), 12046-12051. https://doi.org/10.1021/acs.joc.6b02403