نتایج جستجو برای: keywords β diketone
تعداد نتایج: 2145271 فیلتر نتایج به سال:
Ferrocenyl-β-diketone ligands have been synthesised by the reaction of (ferrocenyl methyl) trimethyl ammonium iodide (FcCH2N Me3I ), where Fc=C5H5FeC5H4 – with sodium salt of -β-diketone [Na+CH-(COR1) (COR2), where R1= R2=CH 3, R1= CH 3 , R2=Ph, R1= R2=CMe 3 ]. The formula of the ligands (1-3) are FcCH 2 CH(COCH 3 )(COCH 3 ), FcCH 2 CH(COCH 3 )(COPh) and FcCH 2 CH(COCMe 3 ) 2 respectively. The ...
This work aims to study the recovery of copper from ammoniacal aqueous solutions using hydrophobic propylene membrane contactors. The hydroxyoxime LIX 84-I and the β-diketone LIX 54 (both from Cognis) were used as extractants. The results obtained showed that practically all the copper content was removed from the ammoniacal feed solutions. The recovery of copper reached nearly 100% in several ...
In this issue of Journal of Experimental Botany (pages 2715–2730) Schneider et al. report the identity of three genes from barley described in the 1970s as important for the synthesis of β-diketone cuticular waxes, thereby revealing a novel polyketide synthase pathway responsible for their production. It is a perfect example of how modern sequencing technologies can resolve age-old questions on...
A highly enantioselective organocatalytic Wolff rearrangement–amidation–Michael– hemiaminalization stepwise reaction is described involving a cyclic 2-diazo-1,3-diketone, primary amine and α,β-unsaturated aldehyde. Product stereocontrol can be achieved by adjusting the sequence of steps in this one-pot multicomponent reaction. This approach was used to synthesize various optically active spiroc...
A low cost, safe, clean and environmentally benign base-catalyzed cyclodehydration of appropriate β-diketones affording (E)-2-styrylchromones and flavones in good yields is disclosed. Water was used as solvent and the reactions were heated using classical and microwave heating methods, under open and closed vessel conditions. β-Diketones having electron-donating and withdrawing substituents wer...
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