Short-term experiments were conducted to investigate the effect of a commercial Fe and an iron-bearing clay mineral, ferruginuous smectite (SWa-1), on the degradation of pentachloroethane (PCA). After 3 h of contact time, SWa-1 catalyzed PCA dehydrochlorination to tetrachloroethene (PCE, 65% conversion), whereas commercial Fe promoted PCA stepwise dechlorination via dehydrochlorination (approxi...

Herein, we report a short, three-step synthesis of d-[1-(14) C]-serine (4) in high enantiomeric purity. Starting from [(14) C]-KCN and 2-(benzyloxy)acetaldehyde, Strecker reaction using (R)-1-phenylethylamine as the chiral auxiliary gave two diastereomeric aminonitriles 1 and 2 in the ratio of 4:3, which were conveniently separated and purified chromatographically. Following hydrolysis and subs...

This paper reports the synthesis and use of Pd/Fe3O4 nanowires, as magnetically separable catalysts for ligand-free amidation coupling reactions of aryl halides with benzylurea under microwave irradiation. Then, the in Situ hydrogenolysis of the products was performed to afford the N-monosubstituted ureas in good to excellent yields. This method has the advantages of high yields, simple methodo...

Catalytic hydrogenolysis in the medium of supercritical organic solvents is a promising way wood lignins depolymerization into liquid products. In this study, for first time, catalytic properties bifunctional catalysts Ru/C, Pt/ZrO2, NiCuMo/SiO2, containing nanosized metal particles on acidic groups are compared processes aspen and ethanol lignin ethanol. The most active Ru/C Pt/ZrO2 which prov...

Significance: A novel general β-arylation of protected alanine esters to yield synthetically useful (hetero)aryl alanine building blocks has been disclosed. The protocol utilizes a lithium amide to form an enolate that undergoes a palladium-catalyzed C–C coupling with various aromatic bromides. Comment: Interestingly, the reaction could be extended to α-amino acids bearing other linear alkyl ch...

The domino Knoevenagel-hetero-Diels-Alder reaction of the aldehyde rac-8, Meldrum’s acid 2 and enol ether 3 leads to the cycloadduct rac-17 as the main product which in a second domino process was transformed into the benzoisoquinolizidine rac-18 by solvolysis, hydrogenolysis, condensation and hydrogenation; rac-18 was used as a substrate for the synthesis of the two diastereomeric epiemetine a...

Papiliochrome II, one of the yellow wing pigments of the Papilionid butterfly, Papilio xuthus, can be split into L-kynurenine and a catecholamine derivative, SN-1, by 10—3 n HCI. The latter is hydrolyzed by n HCI into /^-alanine and noradrenaline. The structure of SN-1 has been elucidated as N-(/?-alanyl)-L-noradrenaline by NM R and MS data as well as by synthesis. Preparation of the N-hydroxys...

A versatile and highly efficient synthesis of monosubstituted ureas is described. The reaction of an amine with 4-nitrophenyl-N-benzylcarbamate, followed by hydrogenolysis, provides the corresponding urea in high yield and purity. This carbamate can also be employed for the derivatization of water-soluble polyamines (e.g. aminoglycoside antibiotics), while other reagents (e.g. benzylisocyanate)...