Methyl 5′-Chloro-8-formyl-5-hydroxy-1′,3′,3′-trimethyl-spiro-[chromene-2,2′-indoline]-6-carboxylate

Spiropyrans modified with reactive polyfunctional substituents are of great interest as building blocks for the creation various smart systems controllable properties materials science and biomedicine. In this study, a new highly spiropyran indoline series, methyl 5′-chloro-8-formyl-5-hydroxy-1′,3′,3′-trimethyl-spiro[chromene-2,2′-indoline]-6-carboxylate, was obtained via cyclocondensation reaction from 5-chloro-1,2,3,3-tetramethyl-3H-indolium perchlorate 3,5-diformyl-2,4-dihydroxy-benzoate. The molecular structure target compound confirmed by 1H, 13C NMR, IR spectroscopy, well LC/MS elemental analysis. Photochemical studies revealed photochromic activity at room temperature. photoinduced merocyanine form demonstrated an enhanced lifetime fluorescent in red region spectrum.