Four Zn, Cd and Mn based 1,10-phenanthroline and halogenated benzoic acid coordination compounds, formulated as Zn2II(H2O)3(phen)(SO4)·H2O (1, phen = 1,10-phenanthroline), ZnII(phen)(L2)2(H2O) (2, L2 = 2-chloro-4-fluorobenzoic acid), MnIV(phen)(L1)4 (3, L1 = 2-Chloro-4,5-difluorobenzoic acid) a...

2-Chloro-4,5-difluorobenzoic acid (CDFBA) and related impurities are determined using liquid chromatography (LC). Separations are achieved using a reversed-phase isocratic system with an ion-pair reagent (tetrabutylammonium hydroxide). Unique isomeric impurities observed in commercially produced...

Arylboronic acids react with carbon monoxide (CO) at atmospheric pressure in methanol at 25°C in the presence of a catalytic amount (1–5 mol%) of tetrakis(triphenylphosphine)palladium(0) to give the corresponding methyl arenecarboxylates and diaryl ketones in moderate yield, where the addition...

The feasibility of enantiomeric excess (ee) prediction is demonstrated for asymmetric oxazaborolidine mediated ketone reduction. A quantitative structure-selectivity (QSSR) model of chiral oxazaborolidines was created by using multivariate data analysis. High-throughput methods and regression te...

The oxidation of three C19 fatty acid methyl esters present in biodiesel fuel was experimentally investigated using a jet-stirred reactor in order to highlight the effect of double bonds on the reactivity and product distribution. Fuel candidates were methyl-stearate, methyl oleate and methyl li...

The first syntheses of enantiomerically pure (2R, 3R) and (2S, 3S) 3-hydroxypipecolic acids 1 and 2 respectively, have been achieved from methyl 7-methyl-3-oxo-6-octenoate. Key steps involved asymmetric hydrogenation and electrophilic amination.

Methyl 3-oxo-8-phenoxy-6-octenoate (1) was cyclized using Pd(OAc)2-PPh3 as a catalyst to give 2-carbomethoxy-3-vinylcyclopentanone (2) and 2-carbomethoxy-4-cycloheptenone (3). The former was the main product in acetonitrile. 2-Alkylated 3-oxo-8-phenoxy-6-octenoates were converted mainly to the f...

The Li enolates of α-benzoyloxy and α-methoxymethoxy ketones 1a and 1c afford nonchelation and chelation aldol products, respectively, both with usefully high diastereofacial selectivities. Evidence suggests that transition state chelation of the benzoyl C=O is responsible for the observed “n...

The swift heavy irradiation induced changes taking place in ethylene–chlorotrifluoroethylene (E–CTFE) copolymer films were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by lithium (50 MeV), carbon (85 MeV), nickel (120 MeV) and silver...

This paper describes an alternative strategy for the preparation of highly ordered molecularly imprinted mesoporous silica microspheres (MIMSM) for the selective fluorescence sensing of sparfloxacin in biological samples. We designed and synthesized a new functional monomer through the thiol-ene...

Intracerebroventricular administration of phelorphan (158 nmol/2 μl), a blocker of dipeptidyl-aminopeptidase (enkephalinase B) and other enzymes involved in the enkephalin biodegradation, inhibited in chronic morphine-dependent rats, the occurrence of some of the naloxone-precipitated withdrawa...

The effect of phelorphan (mercaptoacetyl-Phe-Phe), an inhibitor of various enkephalin-degrading enzymes, was tested in the mouse hot plate test and its efficacy to prevent endogenous enkephalin degradation in mouse striatum was determined. The i.c.v. injection of phelorphan (50 μg) increased th...

The electronic structure of poly(p-phenylene vinylene) (PPV) has been studied using ultraviolet photoelectron spectroscopy (UPS). The experimental results are in excellent agreement with the results of model quantum chemical calculations based upon the valence effective Hamiltonian (VEH) method....

A new silica-based, mixed-binary chiral sorbent grafted with the macrocyclic antibiotic eremomycin and bovine serum albumin (BSA) was obtained. The sorbent-filled high-performance liquid chromatography column was capable of enantioseparation of racemic drugs, such as profens, in reversed-phase-c...

The structure of cepaciamide A was revised to be (3R,3′S,2″S,11″S,12″R)-3-[3′-(2″-hydroxy-11″,12″-methyleneoctadecanoyloxy)hexadecamido]-2-piperidinone with respect to the absolute configuration of the C3′- and C2″-positions and the position of the cyclopropane ring by using synthetic ...

Total syntheses of cepaciamides A and B were accomplished (R)-3-Amino-2-piperidinone was obtained via cyclization of (R)-ornithine. The common amide-linked fatty acid was synthesized via Sharpless AD as the key step. Amide-formation was achieved with DEPC. In the preparation of two fatty acid se...

The two isomeric 7-benzyl-2-(phenoxymethyl)-2,3,6,7,8,9-hexahydro-5H-[1,3]oxazolo[3,2-a] pyrido[4,3-d]pyrimidin-5-one 3 and 7-benzyl-2-(phenoxymethyl)-1,2,6,7,8,9-hexahydro-5H-[1,3]oxazolo[3,2-a]pyrido[3,4-e]pyrimidin-5-one 4 were synthesized by a one-step cyclocondensation from 5-(phenoxymethyl...

The genus Ipomovirus is one of six currently recognized genera in the family Potyviridae. The complete nucleotide sequence of Squash vein yellowing virus (SqVYV), a putative ipomovirus recently described in Florida, has been determined. The 9836 nt SqVYV genomic RNA [excluding the poly(A) tail] ...

The interactions of microbiota in the intestines play an important role in promoting or maintaining the health of hosts. The present study aim to investigate the effects of the surface proteins of Lactobacillus pentosus HC-2 on the immune response and the bacterial composition of Litopenaeus van...

Here we describe the synthesis and the antifibrotic and anticancer activity determination of amino(imino)thiazolidinone derivatives. An efficient one-pot three-component reaction which involved [2 + 3]-cyclocondensation and Knoevenagel condensation was used for the synthesis of 5-ene-2-amino(imi...