Synthesis, structural/photophysical characterization and theoretical investigations with new β-pyridinium/quinolinium and β-bromine substituted bis(1,3-dimethylbarbituric acid) trimethine oxonol dyes that display large Stokes shifts

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

“… 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 ). 25 …”

“…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). 25 In continuation of our interest in the development of trimethinium salts in organic synthesis, [26][27][28][29][30] herein we report a simple and highly efficient synthetic procedure for the preparation of new zwitterionic pyridinium-cyanopropenides from the reaction of trimethinium salts and malononitrile derivatives in the presence of triethylamine in ethanol as a green solvent in excellent yields without any by-products (Scheme 1D).…”

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

“…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).…”

PyrAtes: Modular Organic Salts with Large Stokes Shifts for Fluo‐rescence Microscopy

“…Strikingly, when a solution of the salt was subjected to UV irradiation, intense fluorescence was observed (λ max = 295 nm, λ Em = 430 nm, Φ = 0.49, ɛ = 7200, in methanol). [41][42][43][44][45][46] Prompted by these preliminary results, we carried out extensive reaction optimization (see Supporting Information for details), increasing the yield to 79 % (isolated 72 %).…”