PHOTO- AND THERMOCHROMIC SPIRANS. 35. SYNTHESIS AND PHOTOCHROMIC PROPERTIES OF SPIRO[INDOLINE-2,3'-PYRANO[3,2- f ]QUINOLINES] AND THEIR CATIONIC DERIVATIVES
New photochromic spiropyranoquinolines and their cationic derivatives have been synthesized. Quaternization of the quinoline fragment leads to significant enhancement of the thermal stability of the merocyanine isomers of these cationic spiropyrans. Authors: N. A. Voloshin, S. O. Bezuglyi, A. V. Metelitsa, E. V. Solov'eva, K. E. Shepelenko, and V. I. Minkin. English Translation in Chemistry of Heterocyclic Compounds , 2012, 48 (3), pp 525-531 http://link.springer.com/article/10.1007/s10593-012-1025-z