“…In conclusion, it may be said that the o-amino polyenones 168, 169 and 170 containing a coumarin fragment are very valuable, since coumarin derivatives constitute an important group of organic luminophores and laser dyes which effectively generate radiation in the region of 400 ± 560 nm. 127,128 In addition, they are widely employed in medicine and biochemistry as fluorescent compounds. 129 2,6-Bis(4-dimethylaminoalka-1,3-dienyl)-4Hpyran-4-ones (172) appeared to be very interesting reagents from the spectral and synthetic standpoints.…”