By treatment of a-substituted acetylacetone derivatives with boron trifluoride etherate a series of earlier unknown boron difluoride complexes is obtained. The series includes binuclear complexes containing boron in the chelate fragment connected via sulfur or selenium atom. Gas chromatographic and spectral characteristics of the obtained compounds were investigated. By means of chromato-mass spectrometry their reaction with hydrazine in acidic and alkaline media was studied.
By treatment of a-substituted acetylacetone derivatives with boron trifluoride etherate a series of earlier unknown boron difluoride complexes is obtained. The series includes binuclear complexes containing boron in the chelate fragment connected via sulfur or selenium atom. Gas chromatographic and spectral characteristics of the obtained compounds were investigated. By means of chromato-mass spectrometry their reaction with hydrazine in acidic and alkaline media was studied.
Significant enhancement in radical-scavenging activity of curcuminoids conferred by acetoxy substituent at the central methylene carbon
chain-propagating peroxyl radicals. Curcumin has a unique structure with phenolic hydroxyl group as well as β-diketonemoiety in the same molecule, both of which are able to donate electrons to free radicals. However, due to the reactivity toward molecular oxygen, the carbon-centered radical derived from β-diketonemoiety do not serve as radical-trapping antioxidants. In this study, we reasoned that stabilization