Abstract
A novel green method was developed for the preparation of a squaraine dye, on an 8-mmol scale, by microwave irradiation of two equivalents of 1,3,3-trimethyl-2-methyleneindoline with one equivalent squaric acid in the green solvent, ethyl l-lactate. The time required for this green synthesis is only 4 min. The target squaraine dye was isolated in excellent yield (81%) and with high purity.
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Acknowledgements
We would like to thank Dr. Vlado Gelev from FB Reagents Ltd for the mass spectrum. This work was supported by contract DFNI-TO2/16 of the Bulgarian Science Fund.
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Minkovska, S., Burdzhiev, N., Alexiev, A. et al. A novel fast green method for the preparation of the squaraine dye 3-oxo-4[(1,3,3-trimethyl-3H-indol-1-ium-2-yl)methylene]-2-[(1,3,3-trimethylindolin-2-ylidene)methyl]cyclobut-1-enolate, inner salt. Chem. Pap. 72, 1549–1552 (2018). https://doi.org/10.1007/s11696-018-0398-6
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DOI: https://doi.org/10.1007/s11696-018-0398-6