bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preconcentration of Rare Earth Elements in Seawater with Chelating Resin Having Fluorinated β‐Diketone Immobilized on Styrene Divinyl Benzene for their Determination by ICP‐OES
Authors: Waqar Farhat , Jan Saida , Mohammad Bashir , Hakim Muhammad , Alam Shah , Yawar Wasim 
Published: May 2015

AbstractAn analytical method has been developed for the preconcentration of rare earth elements (REEs) in seawater for their determination by inductively coupled plasma optical emission spectrometry (ICP‐OES). An indigenously synthesized chelating resin was used for the preconcentration of (REEs) which was based on immobilization of fluorinated β‐diketone group on solid support styrene divinyl benzene. Sample solutions (adjusted to optimized pH) were passed through a polyethylene column packed with 250 mg of the resin. Experimental conditions consisting of pH, sample flow rate, sample volume and eluent concentration were optimized. The established method has been applied for the preconcentration of light, medium and heavy REEs in coastal sea water samples for their subsequent determination by (ICP‐OES). Percentage recoveries of La, Ce, Nd, Sm, Eu, Gd, Dy, Er, Yb and Lu were ≥ 95%, a preconcentration factor of 200 times, and relative standard deviations < 5% were achieved.
Determination of Total Polyphenol Glycosides in Polygoni Cuspidati Rhizoma and Rumecis Radix
Authors: Chiang Hsiu‐Mei , Tsai Shang‐Yuan , Hsiao Pei‐Ling , Chiu Chen‐Yuan , Hsiu Su‐Lan , Wen Kuo‐Ching 
Published: May 2015

AbstractPolyphenol glycosides are reported to be hydrolyzed to lower polar aglycones and then become absorbable in the intestine. It would be more reasonable if the total glycosides of active ingredients could be assayed. In this study, the contents of polyphenol glycosides in Chinese herbs—Polygoni cuspidati rhizoma and Rumecis radix—were studied. The contents of aglycones were determined in decoctions of the herbs before and after hydrolysis. The aglycones assayed were emodin and resveratrol for Polygoni cuspidati rhizoma, and emodin and chrysophanol for Rumecis radix. The results showed that the contents of aglycones in Rumecis radix and Polygoni cuspidati rhizoma increased by 9227% and 4930%, respectively, after hydrolysis. In addition, the content of emodin in Polygoni cuspidati rhizoma increased after hydrolysis (9187%), whereas the amount of resveratrol was decreased (40%) as heating time increased. The method in this study can be applied to the determinations of the contents of aglycones and their glycosides in these Chinese herbs for quality control.
Development and Validation of HPLC, TLC and Derivative Spectrophotometric Methods for the Analysis of Ezetimibe in the Presence of Alkaline Induced Degradation Products
Authors: El‐Moghazy Samir Mohamed , Mohamed Mohamed Abd El‐Azem , Mohamed Marwa Fadel , Youssef Nadia Fayek 
Published: May 2015

AbstractReversed phase‐high performance liquid chromatography (RP‐HPLC), thin layer chromatography (TLC) densitometry and first derivative spectrophotometry (1D) techniques are developed and validated as a stability‐indicating assay of ezetimibe in the presence of alkaline induced degradation products. RP‐HPLC method involves an isocratic elution on a Phenomenex Luna 5μ C18 column using acetonitrile: water: glacial acetic acid (50:50:0.1 v/v/v) as a mobile phase at a flow rate of 1.5 mL/min. and a UV detector at 235 nm. TLC densitometric method is based on the difference in Rf‐values between the intact drug and its degradation products on aluminum‐packed silica gel 60 F254 TLC plates as stationary phase with isopropanol: ammonia 33% (9:1 v/v) as a developing mobile phase. On the fluorescent plates, the spots were located by fluorescence quenching and the densitometric analysis was carried out at 250 nm. Derivative spectrophotometry, the zero‐crossing method, ezetimibe was determined using first derivative at 261 nm in the presence of its degradation products. Calibration graphs of the three suggested methods are linear in the concentration ranges 1–10 mcg/mL, 0.1–1 mg/mL and 1–16 mcg/mL with a mean percentage accuracy of 99.05 ± 0.54%, 99.46 ± 0.63% and 99.24 ± 0.82% of bulk powder, respectively. The three proposed methods were successfully applied for the determination of ezetimibe in raw material and pharmaceutical dosage form; the results were statistically analyzed and compared with those obtained by the reported method. Validation parameters were determined for linearity, accuracy and precision; selectivity and robustness and were assessed by applying the standard addition technique.
Synthesis and Antimycobacterial Evaluation on Arylsulfonyl and Arylcarbonyl Derivatives of Ofloxacin
Authors: Chen Yeh‐Long , Chen Yu‐Wen , Lo We‐Fen , Kao Chai‐Lin , Liu Yu‐Shuan , Yao Chen‐Wen , Tzeng Chemg‐Chyi 
Published: May 2015

AbstractFour ofloxacin derivatives 3, 5, 6, and 11 were found to exhibit > 90% inhibition on the growth of M. tuberculosis at a concentration of 6.25 μg/mL. Compounds 3, 5 and 11 have also exhibited a broad spectrum of antibacterial activities while 8‐fluoro‐3‐methyl‐9‐[4‐(4‐nitrophenylsulfonyl)piperazin‐1‐yl)‐6‐oxo‐2,3‐dihydro‐6H‐1‐oxo‐3a‐azaphenalene‐5‐carboxylic acid (6), which exhibited potent activity against the growth of TB with the MIC of 2.23 μg/mL and a selectivity index (SI) of > 14.80, was inactive against the growth of G(+)‐ and G(‐)‐bacteria. Selective anti‐TB activity was achieved by the introduction of an arylsulfonyl group at C‐7 piperazin‐4‐yl of N‐demethyl ofloxacin. Compound 6 is species‐specific, exhibiting no significant activity against the growth of bacterial species other than M. tuberculosis, which implied the possibility of developing new specific anti‐TB drug candidates without inducing cross resistance with other currently used antibacterial drugs. Structural optimization of 6 is on‐going.
Regio‐ and Stereoselective Reaction of α‐Epoxyketones with AlCl3: An Efficient Approach for the Synthesis of Functionalized β‐Chlorohydrines
Authors: Nikpour Farzad , Mozafari Roya , Mogaddam Baran Mohammadi 
Published: May 2015

AbstractA simple and efficient synthesis of functionalized β‐chlorohydrins is described from the regio‐ and stereoselective reaction of α‐epoxyketones with AlCl3 in acetonitrile at room temperature.
Synthesis of Novel Thioglycoside Derivatives Containing Quinazolinone
Authors: Huang Hui , Gao Jian‐Fang , Cao Ling‐Hua , Wang Duo‐Zhi , Zhang Jian‐Bin , Zhou Shu‐Bao , Zhou Yu‐Qiang 
Published: May 2015

AbstractA series of novel thioglycoside derivatives containing 4(3H)‐quinazolinone was designed and synthesized from 2‐chloromethyl‐quinazolin‐4(3H)‐ones and 1‐thioglycose. Several 2‐chloromethyl‐quinazolin‐4(3H)‐ones were synthesized on refluxing with 2‐(chloroacetylamino)‐benzoic acid and arylamines in acetonitrile. All of the novel compounds were characterized by IR, 1H NMR spectra and elemental analysis. The structures of compounds 7b, 8b and 8c have been determined by X‐ray diffraction analysis.
Synthesis and Characterization of Nickel(II) Complex Containing 2‐(t‐Butylaminomethyl)pyrrole
Authors: Hsieh Chang‐Chih , Chao Wan‐Jung , Horng Yih‐Chern , Lee Hon Man 
Published: May 2015

AbstractTwo aminopyrroles, 2‐(t‐butylaminomethyl)pyrrole (HL1) and 2, 5‐di(t‐butylaminomethyl)pyrrole (HL2), were synthesized and the hydrogen‐bond interactions were observed in the single‐crystal X‐ray structures of HL1·HCl and HL2. Bis[2‐(t‐butylaminomethyl)pyrrole]nickel(II) [Ni(L1)2] was prepared by treatment of the NiCl2 with 2 equiv. of mono‐deprotonated HL1 in THF solvent. The solid‐state structure of Ni(L1)2 shows the N4‐coordinated nickel atom, with a geometry corresponding to a square‐planar structure, in which two intramolecular C‐H···Ni interactions are present at the axial positions with contact distances of 2.77 Å. The complex displays an irreversible reduction response at −0.66 V (vs. Fc+/Fc) in CH3CN. Furthermore, 1H, 13C‐HSQC NMR experiments performed at room temperature revealed that the two methylene protons of the chelating L1−1 are chemically nonequivalent and one of them is coupled to the amino proton. The coupling constants (JHH') observed are close to the values predicted from the vicinal Karplus correlation diagram.
AFM‐Correlated CSM‐Coupled Raman/Fluorescence Studies on Selective Interactions of Water Soluble Porphyrins with DNA
Authors: Yoon Min‐Joong 
Published: May 2015

AbstractThe Raman and fluorescence spectroscopic properties of water‐soluble oxo‐titanium(IV) mesotetrakis (1‐methyl pyridium‐4‐yl) porphyrin (O=Ti(TMPyP)4+) bound with calf thymus DNA and artificial DNAs such as double stranded poly[d(A‐T)2] and poly[d(G‐C)2] have been investigated on the single DNA molecule basis by AFM‐correlated confocal scanning microscope (CSM)‐coupled Raman and fluorescence spectroscopic techniques as well as the ensemble‐averaged spectroscopy. The ensemble‐averaged spectroscopic studies imply that the porphyrin interacts with DNA in different groove binding patterns depending on the base pairs. AFM‐images of the different DNAs bound with O=Ti(TMPyP)4+ were measured, and their morphologies are found to depend on kind of base pairs interacting with O=Ti(TMPyP)4+. Being correlated with the AFM images, the CSM‐coupled Raman and fluorescence spectral properties of the three different single O=Ti(TMPyP)4+‐DNA complexes were observed to be highly resolved and sensitive to base pair‐dependent axial ligation of Ti‐O bond as compared to the corresponding ensemble‐averaged spectral properties, which affect the groove binding and its strength of the O=Ti(TMPyP)4+ with DNA. The axial ligation was found to be accompanied by vibration structural change of the porphyrin ring, leading to keep the shape of double stranded poly[d(A‐T)2] rigid while poly‐[d(G‐C)2] and calf thymus DNA flexible after binding with the oxo‐titanyl porphyrin. The base pair dependence of the fluorescence decay times of the DNA‐bound porphyrins was also observed, implying that an excited‐state charge transfer takes place in the G‐C rich major groove in calf thymus DNA. These results suggest that binding of O=Ti(TMPyP)4+ is more preferential with the G‐C rich major groove than with the A‐T rich minor groove in calf thymus DNA so that the morphology of DNA is changed.
Syntheses and Crystal Structures of Copper(II) and Silver Complexes with 5‐Methyl‐1‐(4‐Methylphenyl)‐1,2,3‐Triazol‐4‐Carboxylic Acid
Authors: Wu Yuan‐Gao , Wang Duo‐Zhi , Zhang Jian‐Bin , Cao Ling‐Hua 
Published: May 2015

AbstractTwo novel complexes [CuL2(MeOH)] (1)and [Ag2L(HL)2(MeOH)] (2) (L = 5‐methyl‐1‐(4‐methylphenyl)‐1,2,3‐triazol‐4‐carboxylic acid) were synthesized and characterized by elemental analysis, IR and X‐ray diffraction. Complex 1 is a mononuclear structure; the molecules were assembled into an infinite 2–D supramolecular by the C–H···O weak interactions. Complex 2 is a centrosymmetric dinuclear structure with bis(unidentate) carboxylato co‐ordination mode, and the molecules were assembled into 2–D layers by C–H···O and O–H···O weak interactions.
Interpretation on Band‐Broadening in Chromatography with Spatial Peak Profiles Obtained Using Whole‐Column Detection
Authors: Lin Shu‐Hui , Yu Tiing , Pai Su‐Cheng 
Published: May 2015

AbstractFifteen liquid chromatographic experiments were investigated using a whole‐column detection (WCD) system and a conventional post‐column UV/Vis detector. The peak widths obtained from chromatograms were found dependent on the retention factor; the larger the retention factor was the greater the peak width. However, the on‐column spatial peak widths were dependent on the locations where they were measured in the column. The peak widths monitored at 17 cm from the column inlet were found essentially the same no matter what their retention factors were. In addition, a linear relationship was found between the chromatographic peak width and the reciprocal of the average linear rate of the solute migration. The peak widths on chromatograms did not reflect how they appeared in the column; instead, the widths were determined by the solute speed passing the detector.
Non‐Isothermal Decomposition Kinetics, Specific Heat Capacity and Adiabatic Time‐to‐explosion of a Novel High Energy Material: 1‐Amino‐1‐Methylamino‐2,2‐Dinitroethylene (AMFOX‐7)
Authors: Xu Kang‐Zhen , Song Ji‐Rong , Zhao Feng‐Qi , Heng Shu‐Yun , Ding Li , Wang Yao‐Yu , Hu Rong‐Zu 
Published: May 2015

AbstractA novel high energy material, 1‐amino‐1‐methylamino‐2,2‐dinitroethlyene (AMFOX‐7), was synthesized by the reaction of 1,1‐diamino‐2,2‐dinitroethylene (FOX‐7) and methylamine aqueous solution in N‐methyl pyrrolidone at 80°C. The thermal behavior and non‐isothermal decomposition kinetics of AMFOX‐7 were studied with DSC and TG/DTG methods. The kinetic equation of thermal decomposition reaction can be expressed as: \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm d\alpha /d}T = \frac{{10^{21.03}}}{{\rm \beta}}\frac{3}{2}\left({1 - {\rm \alpha}} \right)\left[{- 1{\rm n}\left({{\rm 1} - {\rm \alpha}} \right)} \right]^{\frac{1}{3}} \exp \left({- 2.292 \times 10^5 {\rm /}RT} \right) $\end{document}. The critical temperature of thermal explosion of AMFOX‐7 is 244.89°C. The specific heat capacity of AMFOX‐7 was determined with micro‐DSC method and theoretical calculation method, and the standard molar specific heat capacity is 199.39 J·mol−1·K−1 at 298.15 K. Adiabatic time‐to‐explosion of AMFOX‐7 was also calculated to be 215.41 s. AMFOX‐7 has higher thermal stability than FOX‐7.
Liquid‐Liquid Microextraction Coupled with High Performance Liquid Chromatography for Determination of Platinum
Authors: Dong Yan‐Jie 
Published: May 2015

AbstractLiquid‐liquid microextraction (LLME) coupled with high performance liquid chromatography (HPLC) for the analysis of platinum is described. The analyte were extracted from 10.0 mL aqueous sample into organic phase. The extraction time was 20 min. Factors such as pH in aqueous phase, extraction times, and stirring rate were optimised. The method was applied for determination of platinum in mixture samples. The linearity range was from 1.0 to 100 nM and the detection limits was 0.1 nM. Relative standard deviations (%, n = 5) was 0.44 to 0.81. All experiments were carried out at room temperature, 35 ± 0.2°C.
Direct Electrochemistry of Hemoglobin and its Electrocatalysis Based on a Carbon Nanotube Paste Electrode
Authors: Zhai Zi‐Qin , Wu Jie , Sun Wei , Jiao Kui 
Published: May 2015

AbstractA new hemoglobin (Hb) and carbon nanotube (CNT) modified carbon paste electrode was fabricated by simply mixing the Hb, CNT with carbon powder and liquid paraffin homogeneously. To prevent the leakage of Hb from the electrode surface, a Nafion film was further applied on the surface of the Hb‐CNT composite paste electrode. The modified electrode was characterized by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). Direct electrochemistry of hemoglobin in this paste electrode was easily achieved and a pair of well‐defined quasi‐reversible redox peaks of a heme Fe(III)/Fe(II) couple appeared with a formal potential (E0′) of −0.441 V (vs. SCE) in pH 7.0 phosphate buffer solution (PBS). The electrochemical behaviors of Hb in the composite electrode were carefully studied. The fabricated modified bioelectrode showed good electrocatalytic ability for reduction of H2O2 and trichloroacetic acid (TCA), which shows potential applications in third generation biosensors.
Determination of Trace Methyl Tert‐Butyl Ether in Water Samples Using Dispersive Liquid‐Liquid Microextraction Coupled with GC‐FID
Authors: Farhadi Khalil , Maleki Ramin , Nezhad Nasim Mohammad 
Published: May 2015

AbstractA rapid and sensitive analytical method has been developed for trace analysis of methyl tert‐butyl ether (MTBE) in water samples using dispersive liquid‐liquid microextraction and gas chromatography with flame ionization detection. Factors relevant to the microextraction efficiency, such as the kind of extraction solvent, the disperser solvent and their volumes, the effect of salt, sample solution temperature and the extraction time were investigated and optimized. Under the optimal conditions the linear dynamic range of MTBE was from 0.2 to 25.0 μg L−1 with a correlation coefficient of 0.9981 and a detection limit of 0.1 μg L−1. The relative standard deviation (RSD%) was less than 5.1% (n = 3) and the recovery values were in the range of 97.8 ± 0.9%. Finally, the proposed method was successfully applied for the analysis of MTBE in aqueous samples.
Heteropolyacid as a New, Green and Recyclable Catalyst for the Synthesis of 2‐Aryl Benzoxazole under Solvent‐Free Conditions
Authors: Heravi Majid M. , Javanmardi Najme , Oskooie Hossein A. , Baghernejad Bita , Heidari Maryam , Bamoharram Fatemeh F. 
Published: May 2015

AbstractA simple, convenient and general method has been developed for the synthesis of 2‐arylbenzoxazole via condensation of o‐aminophenols and benzoyl chloride derivatives under solvent‐free conditions in the presence of a catalytic amount of heteropolyacids in good yields.
Synthesis of 6‐Bromocoumarins Using Tetrabutylammonium Tribromide as a Selective Brominating Agent and an Efficient Generator of HBr
Authors: Wu Li‐Qiang , Yang Chun‐Guang , Wu Yan‐Fang , Yang Li‐Min 
Published: May 2015

AbstractA simple and efficient one‐pot synthesis of 6‐bromocoumarins was achieved in good yields via the three‐component reaction of phenols, 4‐substituted acetoacetate and tetrabutylammonium tribromide (TBATB) in CH2Cl2‐MeOH.
Novel Flame‐Retardant and Thermally Stable Poly(Amide‐imide)s Based on Bicyclo[2,2,2]oct‐7‐Ene‐2,3,5,6‐Tetracarboxylic Diimide and Phosphine Oxide in the Main Chain: Synthesis and Characterization
Authors: Faghihi Khalil , Hajibeygi Mohsen , Shabanian Meisam 
Published: May 2015

AbstractSix novel poly(amide‐imide)s PAIs 5a‐f were synthesized through the direct polycondensation reaction of six chiral N,N′‐(bicyclo[2,2,2]oct‐7‐ene‐tetracarboxylic)‐bis‐L‐amino acids 3a‐f with bis(3‐amino phenyl) phenyl phosphine oxide 4 in a medium consisting of N‐methyl‐2‐pyrrolidone (NMP), triphenyl phosphite (TPP), calcium chloride (CaCl2) and pyridine. The polymerization reaction produced a series of flame‐retardant and thermally stable poly(amide‐imide)s 5a‐f with high yield and good inherent viscosity of 0.39–0.83 dLg−1. The resultant polymers were fully characterized by means of FTIR, 1H NMR spectroscopy, elemental analyses, inherent viscosity, specific rotation and solubility tests. Thermal properties and flame retardant behavior of the PAIs 5a‐f were investigated using thermal gravimetric analysis (TGA and DTG) and limited oxygen index (LOI). Data obtained by thermal analysis (TGA and DTG) revealed that these polymers show good thermal stability. Furthermore, high char yields in TGA and good LOI values indicated that resultant polymers exhibited good flame retardant properties. N,N′‐(bicyclo[2,2,2]oct‐7‐ene‐tetracarboxylic)‐bis‐L‐amino acids 3a‐f were prepared in quantitative yields by the condensation reaction of bicyclo[2,2,2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride 1 with L‐alanine 2a, L‐valine 2b, L‐leucine 2c, L‐isoleucine 2d, L‐phenyl alanine 2e and L‐2‐aminobutyric acid 2f in acetic acid solution. These polymers can be potentially utilized in flame retardant thermoplastic materials.
Hypervalent Iodine(III) Sulfonate Mediated Synthesis of 2‐Arylimidazo[1,2‐a]Pyrimidines in Liquid PEG‐400
Authors: Cheng Hui‐Ting , Hou Rei‐Sheu , Wang Huey‐Min , Kang Iou‐Jiun , Lin Pei‐Ying , Chen Ling‐Ching 
Published: May 2015

AbstractPEG‐400[poly(ethylene glycol‐400)] is used as a “green” recyclable solvent in the one‐pot synthesis of 2‐arylimidazo[1,2‐a]pyrimidines by reaction with ketones, [hydroxyl(2,4‐dinitrobenzenesulfonyloxy)‐iodo]benzene (HDNIB), and 2‐aminopyrimidine. Significant rate enhancements and improved yields have been observed.
Synthesis and Properties of Mixed Ligand Complexes of Diorganotin(IV): Part(VII) – Synthesis and Characterisation of Some Antibacterial Dibenzoylmethane Diorganotin(IV)‐O‐alkyl Trithiophosphates
Authors: Chordia Leena , Chaturvedi Alok 
Published: May 2015

AbstractA series of some new mixed ligand complexes have been synthesized with an objective for evaluation as antimicrobials. Reactions of diorganotin(IV) dichloride with dibenzoyl methane and O‐alkyl trithiophosphates in a 1:1:1 molar ratio in refluxing benzene yield products of the type [PhCOCHCOPh]R2Sn‐[SSH(S)POR'] [where R = Me, Bu, Ph; R' = Me, Et, Pri, Bui, Ph]. The newly synthesized complexes are light yellow colored crystalline solids, non‐volatile, soluble in common organic solvents, monomeric in nature and highly sensitive towards atmospheric moisture. These complexes are characterized by elemental analysis, IR and multinuclear NMR (1H, 31P and 119Sn) spectral studies. Spectral studies of these complexes indicate that dibenzoyl methane and O‐alkyl trithiophosphate moieties are bidentate and the central tin atom is hexacoordinated in nature. A few of these compounds were tested for their antibacterial activity using standard drugs.
Potentiometric Membrane Electrode for Cr(III) Ion Based on a New Aryl Amide Bifunctional Bridging Ligand as a Neutral Carrier
Authors: Ma Yu‐Hua , Yuan Ruo , Chai Ya‐Qin , Liu Xin‐Lu 
Published: May 2015

AbstractA novel Cr(III) ion‐selective electrode is constructed by incorporating a new aryl amide bifunctional bridging ligand, 2,2′‐bis{[(2″‐benzylaminoformyl)phenxoyl]methyl}‐diethylether (BBPMD) as a neutral carrier into the PVC matrix. The proposed electrode, with optimum membrane composition, exhibits an excellent near‐Nernstian response for Cr3+ ion ranging from 2.8 × 10−6 to 1.0 × 10−1 mol/L with a detection limit of 8.6 × 10−7 mol/L and a slope of 19.5 ± 0.2 mV/dec in pH 3.0 nitrate buffer solution at 25 °C. It has an appropriate response time, suitable reproducibility, and good selectivity towards Cr3+ ion. The operational pH range of the proposed electrode is 2.5–6.5. The response mechanism was discussed in view of UV‐vis spectroscopy and the A. C. impedance technique. The excellent analytical features of the proposed electrode could lead to its successful application as an indicator electrode in potentiometric titration of Cr3+ ion and in the direct determination of Cr3+ ion in tea leaves and coffee samples.
Photocatalytic Degradation of Michler's Ketone in Water by UV Light Illumination Using TiO2 Photocatalyst: Identification of Intermediates and the Reaction Pathway
Authors: Lu Chung‐Shin , Mai Fu‐Der , Wu Yi‐Chin , Yao I‐Chun , Hsu Peng‐Yueh , Chen Chiing‐Chang 
Published: May 2015

AbstractThe TiO2/UV photocatalytic degradation of Michler's Ketone (MK) has been investigated in aqueous heterogeneous suspensions. Results obtained show rapid and complete oxidation of MK after 24‐h, and more than 97.5% of MK was mineralized after a 32‐h exposure to UV‐365 nm irradiation. Establishment of the reaction pathway was made possible by a thorough analysis of the reaction mixture identifying the main intermediate products generated. Nine intermediates have been detected by HPLC/ESI‐MS and GC/MS techniques. The photocatalytic degradation of MK proceeds through competitive reactions such as N‐de‐methylation and destruction of the bis‐aminobenzophenone structure. The former reaction took place in a stepwise manner to yield mono‐, di‐, tri‐, tetra‐demethylated species, while the latter reaction yielded N‐methylaminobenzene and aminobenzene. The reaction mechanisms of TiO2/UV proposed in this study should shed some light on future applications of the technology to the destruction of organic pollutants.
New Polyphenols and Triterpene from the Pseudobulbs of Pleione Formosana
Authors: Shiao Young‐Ji , Chen Wan‐Ping , Lin Yun‐Lian 
Published: May 2015

AbstractThree new polyphenolic compounds including a dihydrophenanthrene, pleioanthrenin (1), two bibenzyls, pleiobibenzynin A (2) and B (3), and a new cycloartane triterpenoid, (24R)‐cyclomargenyl p‐coumarate (4), together with eight known compounds, were isolated from the pseudobulbs of Pleione formosana. The structures of the new compounds were elucidated by extensively spectroscopic analysis.