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Various methods for synthesis of 2-methyl-5,6-(1,4,7,10,13-pentaoxatridecamethyl-ene)benzotellurazole (8) are described. Under different conditions, alkylation of compound 8 with methyl iodide gave telluronium salt 1,2-dimethyl-5,6-(1,4,7,10,13-pentaoxatridecamethylene)benzo-tellurazolium iodide (15) or quaternary ammonium salt 2,3-dimethyl-5,6-(1,4,7,10,13-pentaoxatri-decamethylene)benzotellurazolium iodide (14) in high yields, repectively. The cyanine dye 3,3’-dimethyl-5,6,5’,6’-bis(1,4,7,10,13-pentaoxatridecamethylene)telluracarbocyanine iodide (16) is obtained by condensation of 14 with ethyl orthoformate in acetic anhydride. The visible absorption of the cyanine dye is also discussed.
Various methods for synthesis of 2-methyl-5,6- (1,4,7,10,13-pentaoxatridecamethyl-ene) benzotellurazole (8) are described. Under different conditions, alkylation of compound 8 with methyl iodide gave telluronium salt 1 , 2-dimethyl-5,6- (1,4,7,10,13-pentaoxatridecamethylene) benzo-tellurazolium iodide (15) or quaternary ammonium salt 2,3- The cyanine dye 3,3’-dimethyl-5,6,5 ’, 6’-bis (1,4,7,10,13 -pentaoxatridecamethylene) telluracarbocyanine iodide (16) is obtained by condensation of 14 with ethyl orthoformate in acetic anhydride. The visible absorption of the cyanine dye is also discussed.