This research study describes recent advances in understanding the effects of addition organic acids, such as acetic, lactic, citric and phytic on process plasma electrolytic oxidation (PEO) Ti using an alkaline bath. As developed over workpiece is central to determine particular morphological structural features growing oxide, focus then inter-relationships between electrolyte resultant regime...

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Propargyl acetates, in the presence of catalytic amounts of late transition-metal salts such as PtCl(2) or AuCl(3), represent synthetic equivalents of alpha-diazoketones. This notion is corroborated by a concise approach to various sesquiterpene natural products starting from readily available substrates. Specifically, (+)-carvomenthone (17) is converted into propargyl acetate (S)-26 by a seque...

Background: Rootstock is a viticultural practice used to combat the devastating Phylloxera vitifoliae (Fitch). Additionally, it well-known that wine aroma composition depends mainly on variety, viticulture management and winemaking; therefore, rootstocks can affect berry quality. This study evaluated influence of nine (110R, SO4, 196-17C, Riparia G, 161-49C, 420A, Gravesac, 3309C 41B) volatile ...

Gas-tight dense membranes of highly Sr-doped LaCoO, (such as the composition La,,, Sr 0,7 COO, chosen in this study) are difficult to prepare using usual synthesis processes. This report presents an aqueous sol-gel route using metal acetates as precursors to achieve this goal. Hydrogen peroxide and ammonia are added to the acetates precursor solution to obtain stable sol and xerogel, as well as...

A series of (R)-N-Cbz-2-alkyl-2-amino-3-hydroxypropyl acetates was prepared by enzymatic acetylation of NCbz-2-alkyl-2-aminopropane-1,3-diols with immobilized lipoprotein lipase from Pseudomonas sp. in up to 98% enantiomeric excess (ee). Enantiodivergent oxidation of (R)-N-Cbz-2-alkyl-2-amino-3-hydroxypropyl acetates readily furnished (R)and (S)-substituted serines ( -benzylserines and -methyls...

The short syntheses of each of the mono-acetates of N-acetyl-D-neuraminic acid are reported. These are important molecules for studying the mechanism and function of enzymes which utilise Neu5Ac as a substrate. However, until now these molecules were not available as pure compounds and instead had to be studied as mixtures. Neu4,5Ac(2) and Neu5,8Ac(2) were synthesised from a common precursor in...

The use of iodine as a catalyst and either acetic or trifluoroacetic acid as a derivatizing reagent for determining the enantiomeric composition of acyclic and cyclic aliphatic chiral alcohols was investigated. Optimal conditions were selected according to the molar ratio of alcohol to acid, the reaction time, and the reaction temperature. Afterwards, chiral stability of chiral carbons was stud...

A fast and efficient phenylselenylation of allyl acetates by diphenyl diselenide and indium(I) bromide has been achieved in neat under the catalysis of Ru(acac)(3). The intermediate complex of diphenyl diselenide and indium has been isolated and identified as a polymeric pentacoordinated In(III) selenolate complex, [In(SePh)(3)](n).

Benzyne was developed as a reducing agent in the key step of converting amino sugars and ketoses into deoxy sugars, which occur widely in natural products. Many deoxy sugars exhibit antibiotic and anticancer activities, and furthermore, they play essential biological roles. By treatment with CS2 and then Ac2O, amino sugars and ketoses were converted into the corresponding 1,3-thiazolidine-2-thi...