On May 17, 1988, Anzai, Mitsutoshi; Yamaguchi, Masahiko; Utsunomiya, Akira; Gonda, Michihiro published a patent.Synthetic Route of 4569-86-2 The title of the patent was Dihydrophenazine derivatives containing amino group at 3- or 7-position for thermal recording. And the patent contained the following:
The title compounds I [R1 = electron acceptor group-containing aryl or alkyl; R2, R6 = lower alkyl; R3 = (un)substituted aryl or alkyl; R4, R5 = (un)substituted aryl or lower alkyl] are prepared I, which are thermally stable and stable under light, develop bright magenta colors on heating with inorganic nitrates or nitrites or organic nitrates. 3-Amino-7-diethylamino-5-phenylphenazonium chloride was treated with Na2S2O4 and 20% aqueous NaOH in aqueous toluene at 60°, N was introduced, the solution was adjusted to pH ∼4.0 with AcOH, treated with salicylaldehyde at 60° for 3 h, treated with 2-CF3C6H4COCl in the presence of NaOH at 20-30° for 3 h, and hydrolyzed with 1N HCl at 30-35° to give 57.7% I (R1 = 2-CF3C6H4, R2 = R6 = H, R3 = Ph, R4 = R5 = Et) (II). An acetone solution containing II, Zn(NO3)2.H2O, and poly(Me methacrylate) was coated on paper to give a thermal recording material. A bright red-purple color was developed on heating. The experimental process involved the reaction of 3-Amino-7-(diethylamino)-5-phenylphenazin-5-ium chloride(cas: 4569-86-2).Synthetic Route of 4569-86-2
The Article related to aminodihydrophenazine derivative preparation thermal recording, phenazine aminodihydro derivative thermal recording, Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes: Information Recording and Storage and other aspects.Synthetic Route of 4569-86-2
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