7-ALKOXY-8,9-DIHYDROXANTHILIUM SALTS AND METHOD OF THEIR SYNTHESIS Russian patent published in 1997 - IPC

FIELD: organic chemistry. SUBSTANCE: products: compounds of the general formula (I): $$$ where $$$-alkyl; $$$ and $$$-alkyl; $$$ - hydrogen atom; $$$ - hydrogen or halogen atom, $$$-alkyl, $$$-alkoxy- or nitro-group; $$$ - hydrogen atom or allyl; X - $$$. Method of synthesis of compounds (I) involves interaction of 5,5-$$$-1,3-dialkoxy-1-$$$-cyclohexenium salts with o-hydroxyaraldehydes in the presence of trialkyl-ortho-formates. Given: N, $$$, yield (%), m. p. (C), UV-spectrum ($$$ - E, nm): (Ia): $$$, H, H, H, H, H; 62.8, 207-208, 498.0-44864, 531.9-60869; (Ib): $$$, H, H, $$$, H, H; 69.5, 194-195, 520.8-25296, 559.0-40665; (Ic): $$$, H, H, H, H; 57.1, 108-110, 282.0-34960; (Id): $$$, H, H, Br, H, H; 64.0, 238-240, 505.0-37500, 536.5-52614; (Ie): $$$, H, H, $$$, H, H; 73.5, 247-245, 494.1-39015, 527.4-53282; (If): $$$, H, H, $$$, H, H; 65.0, 0.201-203, 508.3-48725, 526.9-61-17. The synthesized compounds show high spectral parameters, high photodynamic stability, stability in solvents and can be used as fluorescent dyes and active media in liquid lasers. EFFECT: improved method of synthesis, enhanced quality and property. 2 cl, 2 tbl