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Optical sensing of sulfate by polymethinium salt receptors: colorimetric sensor for heparin
Synthetic strategy Our syntetic strategy was based on our preliminary results. Bříza, T.; Kejík, Z.; Vašek, P.; Králová, J.; Martásek, P.; Císařová, I.; Král, V. Org. Lett. 2005, 17, 3661-3664 We have used derivatives of benzothiazolium iodide 2, 4 and 5, which were reacted with para-nitrophenylmalondialdehyde 6. In the first step, there was necessary to prepare the salts 2 and 4 5-hydroxy-2-methyl benzothiazole was reacted with propyl iodide under 100 °C for 3 days and corresponding iodoniumdoi:10.1039/b718492a pmid:18401512 fatcat:ogyfgkii4re5bk46nw2rtkwd2a