Synthetic procedures for the preparation of various nitrogen-, oxygen- and sulphur-containing tripodal ligands having a 1,3,5-trimethylbenzene core are reported.

4-Hydroxypyridine undergoes a smooth reaction with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine (15 mol %) to produce the E/Z isomers of dialkyl 2-(4-oxopyridin-1(4H)-yl)but-2-enedioates in high yields.

Several conditions to deprotect triisopropylsilylarylacetylenes were examined. The triisopropylsilyl protecting group was efficiently removed under mild conditions with 1.5 equiv. of AgF in methanol, a protocol recently reported by Kim. A mixture of AgNO3/ KF gave lower yields. Other conditions…

Novel chiral glycinate derivatives (S)-6 and (S)-7 containing the α-phenylethyl group, were prepared and studied as potential precursors of enantiopure α-substituted-α-amino acids. In particular, the alkylation of enolate (S)-7-Li showed substantial (78:22 dr) stereoinduction by the N-(l-phenylethyl)benzamide chiral auxiliary. Addition…

The present report is concerned with the synthesis and coordination compounds of 2-amino(N-aminobenzoyl)benzohydrazid e [ABH]. The ligand was characterized by proton NMR, mass spectrometry, elemental analysis, and infrared studies. The ligand has got -NH2 moiety which is capable of chelation.…

We have found several bands in the visible and near infrared that are related to the primary process of photosynthesis. Starting from the value of 1830 mV (677.5 nm) which was found by some authors and corresponds to activated PSII,…

Keynesian economists have generally supported quantitative easing (QE) on grounds it increases aggregate demand and anything that increases demand at this time of demand shortage is welcome. This paper argues that response may be misplaced. QE may back fire with…

In the present work we calculated reactivity descriptors for atrazine at MP2/6-311++G(2d,2p)//B3LYP/6-311++G(2d,2p) level in order to analyze its reactivity. Reactivity descriptors such as ioniza-tion energy, molecular hardness, electrophilicity, condensed Fukui function and total energies were determined to identify changes in…

0.2 CuO/MgO system prepared by impregnation method was calcined at 350 and 450 °C. The effects of γ-rays (0.2-1.6 MGy) on its structure, surface and catalytic properties were investigated by using XRD, N2-adsorption at -196 °C and catalytic conversion of…

Thermomyces lanuginosus lipase was immobilized in PVA-alginate beads, obtaining immobilization % in the range of 94.4-98.4% using PVA concentrations ranging from 11% to 12.5%, and with cross linking times of 45 and 60 min using boric acid. Initial reaction rate…