SYNTHESIS OF (E,E)-AZOAZOMETHINES BASED ON 4-AMINOAZOBENZENE

Liquid crystal display devices are widely used in industries such as measuring instrumentation, consumer and industrial electronics, medical equipment and others. The production of these devices is a promising and growing branch of industry in Belarus. The analysis of the liquid crystal device market suggests that the demand for film polarizers of all types (transmissive, reflective and permeable-reflective) will increase due to the constant growth of liquid crystal device manufacture and their scope expanding. Currently, manufacturers of liquid crystal devices in Belarus buy polarizers abroad, and the price is determined by the manufacturers. Obviously, the researches aimed at creating domestic film polarizers of various functional purposes and for the development of technologies for their manufacture, are relevant. 4-aminoazobenzene (aniline yellow colorant) is used in the production of more complex intermediates, dyestuffs, chemical additives to polymers, pharmaceuticals, pesticides, etc. 4-aminoazobenzene is an accessible parent compound for the synthesis of promising compounds for the development of optical materials. By reaction of 4-aminoazobenzene series with vanillin aldehydes in a medium of boiling absolute methanol in the presence of catalytic amounts of glacial acetic acid, (E,E)-azoazomethynes with 75–88 % yields were synthesized. 

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