Synthesis and properties of photochromic bisindolinospiropyrans

Spiropyrans: Synthesis, Properties, and Application. (Review)

“…Bisspiropyrans in which the two spiropyran fragments are linked to each other by a simple σ-bond in the hetarene 50-52 or benzopyran 53 component were obtained [86]. The bisspiropyrans 61 and 62 were obtained similarly [91]. The bisspiropyran 63 was obtained by the condensation of a mixture of 2 mole of 1,2,3,3-trimethylindolenylium, 1 mole of 1,3-bischloroacetamidopropane, and 2 mole of sodium iodide with 2 mol of 5-nitrosalicylaldehyde.…”

A bisspiropyran fluorescent probe for the selective and rapid detection of cyanide anion in liqueurs

“…The above synthesis methods all refer to the previous report. 38,39 Then, the produced 5-chloromethylsalicyl aldehyde and N , N ′-(1,4-butanediyl)bis[2,3,3-trimethyl-3 H -indolium]dibromide were used to synthesize SP1. The structures of the products synthesized above were confirmed by 1 H-NMR (Fig.…”

5′-Substituted Indoline Spiropyrans: Synthesis and Applications

“…Symmetric 5 ,5 -dimer SP198 [106] and symmetric and non-symmetric 6,6-bis-SPdimers SP199-SP204 [122][123][124] in which fragments are linked by single C-C-bond were described. SP205 symmetric 5 ,5 -dimer SP-CH 2 -SP was synthesized [125]. Symmetric and non-symmetric 6,6-bis-SP-C≡C-SP SP206-SP210 dimers were prepared via palladiumcatalyzed reaction [126].…”