Frontiers of Chemistry in China

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Oxazine ring construction: methods and applications to natural product synthesis
Frontiers of Chemistry in China - Tập 4 - Trang 249-258 - 2009
Xiaobo Wan, Madeleine M. Joullié
Although natural products containing a 1,2-oxazine ring are rare, more examples in this family of natural products have been discovered since trichodermamides A and B were reported in 2003. In addition to their structural novelty, these natural products possess very interesting bioactivities that are strongly dependent on their structures, making them attractive targets for investigating structure...... hiện toàn bộ
Thin films of α-Fe2O3 nanoparticles using as nonmetallic SERS-active nanosensors for submicromolar detection
Frontiers of Chemistry in China - Tập 6 - Trang 206-212 - 2011
Xiaoqi Fu, Shuang Wang, Qian Zhao, Tingshun Jiang, Hengbo Yin
A new kind of nonmetallic nanosensors based on surface-enhanced Raman spectroscopy (SERS) have been successfully prepared by the assembly of α-Fe2O3 nanoparticles (NPs) onto clean quartz surface via the cross-linker of hexamethylene diisocyanate (HDI). The resultant substrates have been characterized by electron micrographs, which show that the α-Fe2O3 NPs distribute on the modified surface unifor...... hiện toàn bộ
A novel NIR violanthrone derivative with high electron-deficiency: effect of fluorescence on dicyanomethylene substitution
Frontiers of Chemistry in China - Tập 5 - Trang 200-207 - 2010
Bo Liu, Duo Fan, Qiong Zhang, Yu Chen, Weihong Zhu
Near infrared (NIR) dyes attracted increasing interests in widely potential applications, such as fluorescent probe and living organism imaging, due to their low background signals from biomolecules, low light scattering and deep penetration, and low-cost excitation light sources. A novel NIR violanthrone derivative (VA-CN) with dicyanomethylene substitution was synthesized and fully characterized...... hiện toàn bộ
A new molecular rectifier device and some research in its processing
Frontiers of Chemistry in China - Tập 1 - Trang 296-299 - 2006
Bijian Lan, Chunming Liu, Xiang Yin, Hua Zhang, Wei Xu, Zhongyi Hua
Organic materials of D-π-A type MR-X (MR-1: p-dimethylaminophenylethenetrica-rbonitrile and MR-2: p-diphenylaminophenylethene tricarbonitrile) were designed and synthesized. The device with a sandwich structure shows good rectificative phenomena. The highest rectification ratio 10000 was achieved in device Cu/MR-1/Ag, and about 100 in other device M/MR-X/M (M: Cu, Ag). It has been found that recti...... hiện toàn bộ
Synthesis of hydrophobic association cationic starch and its flocculation application on containing algae water of Dianchi Lake
Frontiers of Chemistry in China - Tập 3 - Trang 166-171 - 2008
Xiaojun Xu, Xiangyi Liu, Yuming Yang
The hydrophobic formation cationic starch (PSOAMDA) was prepared from starch (St), octadecyl acrylate (OA), acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC) by means of inverse suspension polymerization with redox initiator. Water with algae from Dianchi Lake was tested with PSOAMDA. Results show that when the molar ratio of St: AM: DMDAAC: OA is 4:8:1.5:0.6 and the reaction tempera...... hiện toàn bộ
Investigation of the interaction of ethyl acetoacetate with nano alumina particle as Lewis acid in acetonitrile solvent
Frontiers of Chemistry in China - Tập 6 - Trang 248-252 - 2011
Asadollah Farhadi, Mohammad Ali Takassi, Mandana Dayer
The enol form of ethyl acetoacetate (EAA) displays interesting spectroscopic characteristics; this form of ethyl acetylacetate is very important in condensation reaction. In this investigation, we have studied the interactions and the complex formation constants (K f) with nano alumina (10–20 nm) particle and alumina (mesh 135) compounds as Lewis acids in the acetonitrile s...... hiện toàn bộ
Phonon dynamics of glassy copper alloys
Frontiers of Chemistry in China - Tập 6 Số 1 - Trang 54-68 - 2011
Aditya M. Vora
Synthesis and fungicidal activity of novel 3,5-diarylpyrazole derivatives
Frontiers of Chemistry in China - Tập 3 - Trang 418-421 - 2008
Xinhua Liu, Jing Zhu, Chunxiu Pan, Bao’an Song, Bo Li
(E)-3-(2-chlorophenyl)-1-(2,4-dichlorophenyl) prop-2-en-1-one was prepared from 2-chlorobenzaldehyde followed by cyclization with hydrazine monohydrate. Eight new 3-(2,4-Di-chlorophenyl)-5-(2-chlorophenyl)-4,5-dihydro-N-acylpyrazole derivatives were synthesized and characterized by elemental analysis, IR and 1H NMR spectroscopy. The experimental results show that the inhibition ratio of compounds ...... hiện toàn bộ
Applications of HPLC-MS in compound Ilex pubescens extract study
Frontiers of Chemistry in China - Tập 1 - Trang 138-144 - 2006
Yunyun Yang, Chen Hongwei, Ming Zhong, Zhiling Ma, Jiuwei Teng, Dehai Mu
In this paper, high performance liquid chromatography (HPLC) along with mass spectrometry (MS) and HPLC along with a diode array detector (DAD) was used to study the compound Ilex pubescens extract. Two ionization techniques: electro spray ionization (ESI) and atmospheric pressure chemical ionization (APCI) were used in this work. The liquid chromatograms obtained by DAD, total ion chromatograms (...... hiện toàn bộ
Investigation into ramie whisker reinforced arylated soy protein composites
Frontiers of Chemistry in China - Tập 5 - Trang 104-108 - 2010
Rakesh Kumar, Lina Zhang
Whiskers were prepared from ramie fibers and were characterized using atomic force microscopy to evaluate their dimensions. SPI/whiskers composites (SW) were prepared by incorporating different weight contents (wt.%) of the whiskers into soy protein isolate (SPI). Thiodiglycol was used as a plasticizer for the preparation of SW composites. The SW composites were arylated with 2,2-diphenyl-2-hydrox...... hiện toàn bộ
Tổng số: 273   
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