Design, synthesis and characterization of new trimethine oxonol dyes from 1,3-indandione and 2-substituted vinamidinium salts

Synthesis of new allylidene amino phenol-containing Schiff bases and metal complex formation using trimethinium salts

“…At rst, compounds 1 were prepared similar to the previous studies. [18][19][20][21][22][23][24][25] Then the results were treated with aminophenol derivatives to afford the related Schiff base ligands as the desired products. As Table 2 indicates, a variety of trimethinium salts were successfully applied in this process to afford the corresponding Schiff base ligands derivatives as novel compounds with excellent yields.…”

“…One of the useful attributes of many vinamidinium salts is their ease of preparation from substituted acetic acids under Vilsmeier-Haack conditions. [12][13][14][15][16][17][18][19][20][21][22][23] "In this study, our research group was able to prepare bsubstituted trimethinium salts with different R groups (including aryls and heteroaryls) from correspondingly substituted acetic acids, R-CH 2 CO 2 H, with good yields". 24,25 In continuation of this research on applications of trimethinium salts in organic synthesis (Scheme 1), [26][27][28][29][30][31] in this study, we report a new and highly efficient method for the synthesis of a novel class of allylidene amino phenol-containing Schiff bases from the reaction of trimethinium salts and diverse aminophenols in the presence of triethylamine, under catalyst-free conditions in EtOH at reux (Scheme 2).…”

An efficient route to the synthesis of novel zwitterionic pyridinium-cyanopropenides with 3-heteroaryl-substituted trimethinium salts

“…For example, in 2019, Naimi-Jamal obtained trimethine oxonol dyes from the reaction of 1,3-dimethylbarbituric acid with vinamidinium salts ( Scheme 1A ). 4 They also produced other trimethine oxonol dyes from the same salts with 1,3-indandione ( Scheme 1B ). 24 Mazières isolated trimethine benzothiazole cyanine dyes using the orthoester approach ( Scheme 1C ).…”

“…1,2 Polymethine dyes have unique inherent properties include conjugated structure, relatively good stability, medium uorescence intensities, high molar absorption coefficients (about 10 5 dm 3 mol À1 cm À1 ), and narrow bandwidths invisible region. 3,4 Cyanine dyes are compounds that have a wide range of applications in many elds of science, pharmacology, medicine, and technology engineering. Such as bactericidal and fungicidal, anti-cancer, acid-base indicators, laser technology, organic solar cells, dyes for polymers, and spectral sensitizers for silver halide emulsion, etc.…”

“…1,2 Polymethine dyes have unique inherent properties include conjugated structure, relatively good stability, medium fluorescence intensities, high molar absorption coefficients (about 10 5 dm 3 mol −1 cm −1 ), and narrow bandwidths invisible region. 3,4…”