DIBENZO(B,E)-PYRANO(3,2-B)-BENZOPYRILIUM SALTS AND METHOD OF THEIR SYNTHESIS Russian patent published in 1997 - IPC

FIELD: organic chemistry and technology. SUBSTANCE: product: compounds of the general formula (I) where: R₁= - hydrogen or halogen atom, C₁-C₆-alkyl, C₁-C₆-alkoxy or nitro-group; R₂ - hydrogen or halogen atom or allyl; R₃= - hydrogen atom, C₁-C₆-alkyl, C₁-C₆-alkoxy, di-(C₁-C₆)-alkylamino or nitro-group; R₄ - halogen atom; R₅, R₆-C₁-C₆-alkyl.Methodofsynthesisinvolvesinteractionof2-R₄-5,5--R₅, R₆-cyclohexene-1,3-diones with salicylic aldehyde or its substituted derivatives in the presence of perchloric acid and triethyl-ortho-formate. Given: N; R₁, R₂, R₃, R₄, R₅, R₆; yield (%); m. p. (C); UV-spectrum (L max - E, nm): 1a; H, H, H, Br; CH₃; CH₃; 55.1; 308-310; 548.2-33.51. 1b; CH₃,, H, H, Br; CH₃,; CH₃;; 43.6; 305-307; 555.6-82.78. 1c; H, CH₃,, CH₃,, Br; CH₃; CH₃;; 41.0; 303-305; 563.1-40.11. 1d; OCH₃, H, H, Br; CH₃,; CH₃;; 53.5; 307-309; 573.4-85.61. 1e; NO₂,, H, H, Br; CH₃,; CH₃;; 54.5; 342-344; 548.2-57.57. 1f; Cl, H, H, Br; CH₃; CH₃; 51.8; 322-324; 553.1-87.65; 1g; Br, H, H, Br; CH₃,; CH₃; 63.2; 301-304; 555.6-102.17. 1h; Br, Br, H, Br; CH₃,; CH₃;; 69.0; 341-343; 558.0-44.92. 1i; Br, Br, OCH₃,, Br; CH₃,; CH₃;; 42.5; 345-347; 573.4-113.65. 1j; H, CH₂OH=CH₂,, H, Br; CH₃,; CH₃;; 87.2; 219-220; 550.7-105.13. 1k; CH₃,, H, NO₂,, Br; CH₃,; CH₃;; 45.7; 348-350; 553.1-90.34. 1l; H, H, N(CH₃)₂, Br; CH₃,; CH₃;; 41.4; 318-320; 698.3-81.72. Synthesized compounds exhibit high spectral properties and can be used as fluorescent dyes for anion-modified fibers and films staining. EFFECT: improved method of synthesis, enhanced quality and properties. 2 cl, 2 tbl