Polymethine dyes derived from boron complexes of acetylhydroxycoumarins

Synthesis and structures of boron complexes of acyl hydroxy coumarins

“…Earlier, 4 we have observed high reactivity of acyl hydr oxy coumarin complexes with boron trifluoride in con densation reactions. In the present study, the synthesis conditions and the structural features of this type of boron complexes were examined in detail.…”

Expedious synthesis for α, β-unsaturated coumarin derivatives using boran chelates: A novel class of potential antibacterial and antioxidant agents

“…The quick reaction led to the desired product without obtaining any product from the intramolecular condensation of 4-hydroxycoumarin [27]. We have observed previously [28] that the reaction between hydroxyacetylcoumarin and boron compounds substantially increases the acidity of Ha atoms. For instance, reactions of 3-acetyl-4-difluoro boryloxycoumarin (2) with triethyl orthoformate, Fischer aldehyde and DMF produces symmetrical and unsymmetrical polymethine dyes in high yields [29] which are identified by their intense absorption in the visible region and fluorescence properties.…”

Investigation on Water Retention Properties of Boric Acid Doped Textile Surfaces

“…Boron consumption in Turkey is at very low level, of around 1-2% of world's consumption. As of 2000, Turkey's boron was consumed in production of steel 27%, glass 12% and fiberglass 38%, ceramic 12%, detergents 5%, and 6% in other sectors of chemistry [3].…”