bluuebunny/crossref_metadata_2025_split huggingface dataset:
Theoretical studies on NLO properties of push‐pull multi‐cycle electro‐optical polymer intermediates including thiophene ring
Authors: Fu Wei , Feng Ji‐Kang , Yu Kun‐Qian , Ren Ai‐Min , Wang Jiang‐Hong , Shen Yu‐Quan 
Published: September 2010

AbstractThe second‐order nonlinear optical susceptibilities β, βμ, and third‐order non‐linear optical susceptibilities γ, 〈γ〉 of a series of the novel push‐pull multi‐ring electro‐photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum‐overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.
Extraction of copper with p‐tert‐butyl‐calixarenes
Authors: Yang Yu‐Xiang , Shi Xian‐Fa , Ding Shi‐Chao , Chen Yu‐De , Xu Di‐Min , Chen Rang‐San 
Published: September 2010

AbstractThe extraction of copper with calixarenes was researched by comparing the results from calix[4]‐, calix[6]‐ and calix[8]‐arenes. The extraction ability increased as the order: calix [4]⇛ calix[8]⇛ calix[6]‐arenes, with the binding ratio being 1:1. The extraction mechanism was also discussed, and its equation Cu(NH3)42+ +H2L(0)→KexCu(NH3)4L(0) +2H+ and the extraction equilbrium constants (Kex) for calix[6]‐ and calix[8]‐arenes were obtained respectively.
Synthesis, characterization and magnetism of copper(II)‐lanthanide(III) heterobimetalic complexes with N, N'‐oxamidobis‐(benzoato)cuprate (II)
Authors: Li Yan‐Tuan , Yan Cui‐Wei , Zeng Xian‐Cheng , Liao Dai‐Zheng 
Published: September 2010

AbstractSeven new μ‐oxamido copper(II)‐lanthanide(III) heterobimetalic complexes described by the formula Cu(obbz) Ln‐(Ph‐phen)2NO3(Ln = La, Nd, Eu, Gd, Tb, Ho, Er), where obbz denotes the oxamidobis(benzoato) and Ph‐phen represents 5‐phenyl‐1, 10‐phenanthroline, have been synthesized and characterized by the elemental analyses, spectroscopic (IR, UV, ESR) studies, magnetic moments (at room temperature) and molar conductivity measurement. The temperature dependence of the magnetic susceptibility of Cu(obbz)Gd(Ph‐phen)2NO3 complex has been measured over the range 4.2–300 K. The least‐squares fit of the experimental susceptibilities based on the spin Hamiltonian operator, Ĥ = −2 JŜ1·Ŝ2, yielded J= +1.28 cm−1, a weak ferromagnetic coupling, A plausible mechanism for a ferromagnetic coupling between Gd(III)‐Cu(II) is discussed in terms of spin‐polarization.
Lipophilicity determination of N‐( benzothiazol‐2‐yl )‐α‐amino alkyl phosphonic diesters by RP‐HPLC and RP‐HPTLC
Authors: Zhang Luig , Li Zai‐Guo , Huang Run‐Qiu , Wang Qin‐Sun 
Published: September 2010

AbstractUsing methanol‐water mixtures as the mobile phase, the chromatographic retention parameters k' and Rf were determined by reversed‐phase high‐performance liquid chromatography (RP‐HPLC) and reversed‐phase high‐performance thin‐layer chromatography (RP‐HPTLC) for N‐(benzothiazol‐2‐yl)‐α‐amino alkyl phosphoric diesters and the correlation with lipophilicity parameter (Clog P) was established. Log Kw values obtained from RP‐HPLC and Rm values obtained from RP‐HPTLC can be used to evaluate the lipophilicity of this kind of compounds. Chromatographic method is a good alternative for lipophilicity measurement.
Synthesis of indenyllanthanide amides: the effective initiators for polymerization of methyl methacrylate
Authors: Zhao Qun , Yao Ying‐Ming , Shen Qi 
Published: September 2010

AbstractDiisopropylamido bisindenyl lanthanides (C9H7)2LnN(i‐Pr)2 (Ln=Gd(1), Y(2), Er (3)) were succesfully synthesized in satisfied yield by the reaction of Ln(N(i‐Pr)2)3(THF) with indene in 1:2 molar ratio in toluene. AH of the complexes exhibit very high catalytic activity in the polymerization of methyl methacrylate. The resulting polymers have narrow molecular weight distributions and high syndiotacticity.
A facile route for the syntheses of trisilanes containing C‐mono‐substituted carborane
Authors: Luo Yu‐Mei , Liu Fei , Wu Shi‐Hui 
Published: September 2010

AbstractThe syntheses of trisilanes containing C‐monosubstituted o‐carborane are described. The intermediate compund 2‐chloro‐2‐phenyl‐hexamethylsilane was prepared by elimination reaction between 2, 2‐diphenylhexamethyltrisilane and hydrogen chloride with a catalytic amount of aluminium chloride in chloroform solution.
Self‐assembly architecture of bis(guanidiniums) receptors incorporated by sulfate anions in single crystals
Authors: Lu Guo‐Yuan , Song Wd , Tang Feng , Jin Chuan‐Min , Liu Fang , Wan Xiao‐Bin 
Published: September 2010

AbstractA novel bis(guanidiniums) receptor for the catalytic cleavage of phosphosdiester was prepared and self‐assembly architecture through hydrogen bonds and electrostatic interactions among the bis(guanidiniums) receptor, the sulfate anion and water molecule was revealed by X‐ray crystallographic analysis.
Photolysis of oxygen saturated ethers in the presence of Sn(II) or Cu(II) salts
Authors: Shi Min 
Published: September 2010

AbstractPhotolysis of diethyl ether‐oxygen charge transfer complex in the presence of Sn(II) or Cu(II) salts gave higher yields of the oxidation products, ethyl acetate, acetaldehyde, ethanol, ethyl formate and methanol compared with those without the salts. In addition, the photolysis of an oxygen saturated tetrahydrofuran (THF) or dibutyl ether solution gave γ‐butyrolactone or butanol and butyl butyrate as major products with small amounts of undetermined compounds, respectively. Their yields were also affected by the addition of Cu(II) or Sn(II) salts.
Oxidative Coupling of Methane over W‐Mn/SiO2 Catalyst
Authors: Li Shu‐Ben 
Published: September 2010

AbstractW‐Mn/SiO2 catalyst has been developed in our laboratory (LICP), which is active, selective and stable for oxidative coupling of methane (OCM) in fixed bed and fluidized bed reactors. The research results have been reproduced at different reaction conditions by two groups of J. H. Lunsford (JH‐LL) from Texas A & M University and R. M. Lambert (RMLL) from University of Cambridge respectively. The basic research aspects on this catalyst systems, reaction performances, structure characterization and reaction mechanism were reviewed. A model on two active sites related to W6+/5+ and Mn3+/2+ has been suggested for activation of methane and oxygen respectively.
Enantiocontrol in Macrocycle Formation from Catalytic Metal Carbene Transformations
Authors: Doyle Michael P. , Hu Wen‐Hao 
Published: September 2010

AbstractThe development of catalytic metal carbene transformations for the construction of macrocyclic lactones has dramatically increased their synthetic advantages. This is the first review of this Developing methodology.The research described in this review has been supported by the National Science Foundation, National Institutes of Health, and the Petroleum Research Fund of the American Chemical Society.
Synthesis of Some Novel Amino Phenols with Octahydro‐1,1′‐binaphthyl Backbone
Authors: Guo Hui , Wang Yi , Ding Kui‐Ling 
Published: September 2010

AbstractA series of new octahydro‐1,1′‐binaphthyl derivatives, namely (R)‐(+)‐2‐(N, N‐dialkylamino)‐2′‐hydroxy‐5,5′,6,6′,7, 7′,8,8′‐octahydro‐1,1′‐binaphthyls (7,9), have been synthesized. Their asymmetric induction for enantioselective addition of Et2Zn to benzaldehyde was examined and it was found that (R)‐(+)‐2‐(N‐cyclohexyl‐N‐methylamino)‐2′‐hydroxy‐5, 5′,6,6′,7,7′,8,8′‐octahydro‐1,1′‐binaphthyl (9c) exhibited the best asymmetric induction among the ligands prepared, up to 55% ee of 1‐phenylpropanol being obtained.
1‐Dodecene Hydroformylation Catalyzed by Water Soluble Rhodium Phosphine Complex in Two‐Phase System
Authors: Li Yao‐Zhong , Chen Hua , Chen Jun‐Ru , Cheng Pu‐Ming , Hu Jia‐Yuan , Li Xian‐Jun 
Published: September 2010

Abstract1‐Dodecene hydroformylation catalyzed by water soluble rhodium complex [RhCl(CO) (TPPTS)2] was studied in the presence of TTPTS [P(m‐C2H4SO3Na)3] and CTAB (cetyltrimethyl ammonium). The influence of reaction parameters was discussed in detail based on micelle effect in biphasic system. The modification for the microcircumstance of micelle interface was conducted by the introduction of a catalyst promoter TPPDS [PhP(m‐C2H4SO3Na)2] into the reaction solution. A synergistic effect between TPPDS and TPPTS on the regioselectivity of 1‐dodecene hydroformylation was observed. The selectivity of linear aldehyde in the products was so high as 95.7% at the molar ratio of [TPPDS]/[TPPTS] = 0.5.
Catalysis for One‐step Synthesis of Dimethyl Ether from Hydrogenation of CO
Authors: Zheng Xiao‐Ming , Fei Jin‐Hua , Hou Zhao‐Yin 
Published: September 2010

AbstractIn this paper, a new catalyst system Cu‐Mn‐(M)/γ‐Al2O3 was developed for the directly synthesis dimethyl ether (DME) from synthesis gas in a fixed‐bed reactor. The catalysts with different n (Cu) : n (Mn) ratios, several promoter M (M is one of Zn, Cr, W, Mo, Fe, Co or Ni) were prepared and tested. The results showed the catalysts have a high conversion of CO and a high DME selectivity. The DME yield in tail gas reached 46.0% (at 63.27% conversion of CO) at 2.0 MPa, 275°C, 1500 h−1 with the Cu2Mn4Zn/γ‐Al2O3 catalyst.
An Unusual Variation of Surface Tension with Concentration of Mixed Cationic‐anionic Surfactants
Authors: Xiao Jin‐Xin , Bao Yan‐Xia 
Published: September 2010

AbstractThere are two platforms in the surface tension vs. concentration curve (γ‐lgC curve) of cationic‐anionic surfactant mixtures. The first platform is the same as that of common surfactant solution, and the cross point is the CMC. After the CMC, the mixtures form precipitate. At higher concentration, the mixtures form homogeneous solution again. When the mixtures form homogeneous solution at high concentration, surface tension increases with concentration, then becomes constant. So the γ‐lgC curve exhibits the second platform. The surface tension at the second platform increases by increasing molar ratio of two surfactants and polar group size of surfactants, and decreases with adding inorganic salts.
Photosensitization of Nanocrystalline TiO2 Electrode Modified with C60 Carboxylic Acid Derivatives
Authors: Zhang Wen , Shi Ya‐Ru , Gan Liang‐Bing , Huang Chun‐Hui , Wang Yan‐Qin , Cheng Hu‐Min 
Published: September 2010

AbstractC60 carboxylic acid derivatives can be readily adsorbed on the surface of nanocrystalline TiO2 film. The C60 carboxylic acids adsorbed on nanocrystalline TiO2 films act as charge‐transfer sensitizer. The electron transport from TiO2 to the C60 derivatives results in the generation of the cathodic photocurrent. The short‐circuit photocurrent of a C60 tetracarboxylic acid is 0.45 μA/cm2 under 464 nm light illumination. The photoelectric behaviour of ITO electrodes modified by the same C60 carboxylic acids is different from that of the modified TiO2 electrodes, and shows anodic photocurrent.
A Novel Domino Reaction of 1, 1'‐bi‐2‐Naphthol Catalyzed by Copper (II)‐amine Complexes
Authors: Tan Duan‐Ming , Li Hui‐Hua , Wang Bo , Liu Han‐Biao , Xu Zun‐Le 
Published: September 2010

Abstract1,1′‐Bi‐2‐naphthol (1) was oxidized into q‐oxo‐13c‐alkyloxy‐l,13c‐dihydro‐dibenzo [a,kl]‐xanthenes (2–11) with high isolated yields (58–94%) in alcohol solvents under the catalysis of copper(II)‐amine complexes in the presence of oxygen. The conversion of 1 to 2–11 belongs to Domino‐reaction.
Highly Enantioselective Microbial Hydrolysis of cis‐2‐Arylcyclopropanecarbonitriles
Authors: Feng Guo‐Qiang , Wang Mei‐Xiang 
Published: September 2010

AbstractHydrolysis of racemic cis‐2‐arylcyclopropanecarbonitriles catalyzed by Rhodococcus sp. AJ270 whole cells proceeded enantioselectively to afford the corresponding amide and acid with enantiomeric excess higher than 99%.
A Novel Way to Prepare TiO2 and γ‐Al2O3 Supported Catalysts with Large Surface Areas
Authors: Zhu Yue‐Xiang , Zhao Bi‐Ying , Zhou Chang‐Jun , Wang Rong‐Qiu , Xie You‐Chang 
Published: September 2010

AbstractSeveral TiO2 and γ‐Al2O3 supported catalyst systems were prepared by a novel way and characterized by X‐ray diffraction, Raman spectroscopy and BET surface area measurement. The results show: (1) all the samples, including MoO3/TiO2, WO3/TiO2, V2O5/TiO2, FeSO4/γ‐Al2O3, Al2 (SO4)3/γ‐Al2O3, K2CO3/‐Al2O3 and so on, prepared by impregnating TiO2·H2O or pseudo‐boehmite AlO(OH) with the active components then calcining at a high temperature exhibit much larger surface areas than that of pure TiO2 or γ‐Al2O3 calcined at the same temperature; (2) the surface area of the sample increases with the increase in the coverage of active component on the surface of the support; (3) when the content of active component reaches its utmost monolayer dispersion capacity, the surface area of the sample is the largest, and then decreases when the content of active component exceeds its dispersion threshold.
Hydrotrope‐Solubilization Action of Urea in CTAB/n‐C5H11‐OH/H2O System
Authors: Guo Rong , Zou Ai‐Hua , Yang Han‐Min 
Published: September 2010

AbstractUrea can enhance the aqueous solubility of surfactant CTAB (hexadecyltrimethylammonium bromide) when it shows the hydrotrope action. It will show the hydrotrope‐solubilization action when the solubilized amount of n‐C5H11OH in O/W microemulsion and that of water in W/O microemulsion are increased. The mechanism of the hydrotrope‐solubilization action of urea is the increase of the stability of W/O and O/W microemulsion and structural transition from the lamellar liquid crystalline phase to the bicontinuous structure.
Supramolecular Complexation Behavior of Novel Cyclotriveratrylene Derivatives with Benzoate Pendants with C60
Authors: Zhan Hao‐Qiang , Jiang Xi‐Kui , Li Zhan‐Ting 
Published: September 2010

AbstractFour novel cyclotriveratrylene (CTV) derivatives with three benzoate pendants bearing different aliphatic chains have been prepared in good yields, starting from CTV. The complexation behavior of these CTV derivatives towards C60 in arene solvents has been measured by UV‐visible spectroscopy and high complexation constants are obtained. It is observed that the complexation is promoted pronouncedly by introducing methyl ester groups to the aromatic pendants, while this promoting effect is reduced when the methyl groups are replaced by longer alkyl groups.
EPR Study on the Complex Formed by Charge‐Transfer Process between Ground‐state Acceptor 2, 3‐Dicyano‐5, 6‐dichloro‐1, 4‐benzoquinone and Some Donors and on Cation Radical of Perylene (or Pyrene)
Authors: Shi Ji‐Liang , Zhou Cheng‐Ming , Zhao Xin , Xu Jia‐Yi , Jiang Xi‐Kui 
Published: September 2010

AbstractEPR study showed that the semi‐quinone radical anion of 2,3‐dicyano‐5,6‐dichloro‐1,4‐benzoquinone (DDQ) was formed in a charge transfer process between ground‐state DDQ as acceptor and each one of following ground state donors, i.e., 4‐methyl‐4′‐tridecyl‐2, 2′‐bipyridyl; 4‐methyl‐4′‐nonyl‐2, 2′‐bipyridyl; bis (2,2′‐bipyridyl) (4‐methyl‐4′‐heptadecyl‐2, 2′‐bipyridyl)ruthenium(2+) perchlorate and perylene. EPR study also showed that there are perylene cation radical and pyrene cation radical in the following experimental conditions: (a) in 98% sulfuric add. (b) 10−3 mol/L perylene (or pyrene) was dissolved in trifluoroacetic acid‐nitrobenzene (1: 1 V/V).
Asymmetric Photochemical Synthesis of Chiral 5‐(R)‐(l)‐Menthyloxy‐4‐Cycloaminobutyrolactones
Authors: Wang Zhao‐Yang , Jian Tian‐Ying , Chen Qing‐Hua 
Published: September 2010

AbstractThrough photocatalysed regiospecific and stereoselective additions of cycloamines to 5‐(R)‐(l)‐menthyloxy‐2 (5H)‐furanone (3), chiral 5‐(R)‐(l)‐menthyloxy‐4‐cycloaminobutyrolactones were synthesized. In the new asymmetric photoaddition of compound 3, the N‐methyl cyclic amines (4) gave novel chiral CC photoadducts (5) in 24–50% isolated yields with d. e. ≥ 98%. However, the secondary cyclic amines (6) afforded optically active NC photoadducts (7) in 34–58% isolated yields with d. e. ≥ 98% under the same condition. All the synthesized optically active compounds were identified on the basis of their analytical data and spectroscopic data, such as [α]58920, IR, 1H NMR, 13C NMR, MS and elementary analysis. The photosynthesis of chiral butyrolactones and its mechanism were discussed in detail.
Low‐Valent Titanium Induced Simultaneous Reduction of Nitro Group and SS Bond in Nitrodisulfides: A Facile Synthesis of 2H‐1,4‐Benzothiazines
Authors: Zhang Yong‐Min , Zhong Wei‐Hui , Chen Xiao‐Yian 
Published: September 2010

AbstractThe simultaneous reduction of nitro group and SS bond in nitrodisulfides by TiCl4/Sm system led to the active intermediates 2, which were “living” double‐anions in situ and reacted smoothly with ω‐bromoketones to afford the desired 2/7–1,4‐benzothiazines in good yields under mild and neutral conditions.
Synthesis of New Chiral Calix [4] crown Containing (R)‐Cysteine
Authors: He Yong‐Bing , Xiao Yuan‐Jing , Wu Jin‐Long , Meng Ling‐Zhi , Wu Cheng‐Tai 
Published: September 2010

AbstractThree new chiral heterocalix [4] crowns containing aza thio atoms bearing two chiral sites provided by (R)‐cysteine ester were synthesized. All new compounds were characterized by 1H NMR, MS and elemental analysis.
Insertion of Dichlorocarbene into CB Bond of Borinates under Liquid‐Liquid Phase Transfer Catalysis Conditions: A Convenient Preparation of Unsymmetrical Ketones
Authors: Huang Shi‐Wen , Guo Feng , Shan Zi‐Xing , Zhao De‐Jie 
Published: September 2010

AbstractUnsymmetrical ketones were conveniently prepared from the unsymmetrical diorganyl borinates via the insertion of dichlorocarbene into CB bond under liquid‐liquid phase transfer catalysis conditions and oxidation with alkaline hydrogen peroxide in 35–67% yields.
Comparison of Ethene Diffusion Characteristics in H[Al]ZSM‐5 at 300 K and 400 K by Molecular Dynamics
Authors: Fan Jtan‐Fen , Xia Qi‐Ying , Gong Xue‐Dong , Xiao He‐Ming 
Published: September 2010

AbstractThe ethene diffusion characteristics in the framework of H[Al]ZSM‐5 at 300 K and 400 K have been studied by molecular dynamics (MD) simulation. The data have been obtained for the molecular kinetic, potential and total energies, mean square displacement and self‐diffusion coefficient, interaction and beat of adsorption. The dependence of molecular diffusion on temperature has been explored.
Synthesis, Crystal Structure and Third‐order Nonlinear Optical Properties of Nest‐shaped Cluster [CuBr(bpy)2] [MoOS3Cu3‐Br2(bpy)]
Authors: Song Ying‐Lin , Hou Hong‐Wei , Fan Yao‐Ting , Du Chen‐Xia , Zhu Yu 
Published: September 2010

AbstractNest‐shaped cluster [CuBr(bpy)2][MoOS3Cu3Br2(bpy)] was synthesized by the treatment of (NH4)2 MOO2S2, CuBr and Et4NBr with bpy (2,2′‐bipyridyl) in CH3CN. Its structure has been characterized by X‐ray diffraction; monoclinic, space group P21/n ‐ with a = l.0092(4), b = 2.6347(7), c = 1.4087(3) nm, β = 91.744(9)°, V = 3.7438 nm3, Z=4, and final R = 0.051, Rw = 0.053. It consists of two parts: nest‐shaped structural unit [MoOS3Cu3Br2(bpy)] and complex ion [CuBr(bpy)2]+. We determined its third‐order nonlinear optical (NLO) properties with a 7‐ns pulsed laser at 532 nm. The duster exhibits strong NLO refractive behavior, its third‐order susceptibility χ(3) was calculated to be 2.7 · 10−11 esu in a 7.8 · 10−4 g/cm3 DMF solution. The value is comparable to those of inorganic dusters.
Design and Synthesis of Novel Peptide Nucleic Acid Monomers
Authors: Bai Jin‐Quan , Li Ying , Liu Ke‐Liang 
Published: September 2010

AbstractAll of the four nucleobases in DNA have replaced the 4‐hydroxy group of N‐[2‐(tert‐butoxycarbonylaminomethyl)‐trans‐4‐hydroxy] tetrahydropyrrole acetic acid methyl ester with cis ‐stereochemistry. An efficient route for the synthesis of N‐[2‐(tert‐butoxycarbonylaminomethyl)‐trans‐4‐hydroxy]‐tetrahydropyrrole acetic acid methyl ester has been developed. Starting with this intermediate, the protected monomers were synthesized by the Mitsunobu reaction or via its tosylate.
Markovnikov Regiocontrol in Hydroboration of Alkene by Trifluoromethyl Substituent
Authors: Fan Yu‐Bo , Wang Quan‐Rui , Ding Zong‐Biao , Tao Feng‐Gang 
Published: September 2010

AbstractThe reaction of dichloroborane BHCl2 with 3,3,3‐trifluoro‐prop‐1‐ene (TFP), and propene have been studied using B3LYP method with 6–31G+ basis set. Based on the calculations, all transition structures have parallelogram‐like H‐B‐C‐C four‐center geometry with small deformations. The introduction of fluorine atoms changes the proportions of hydroborational products and reverses the regioselectivity.
Theoretical Study on Second‐order Nonlinear Optical Properties of Substituted Thiazole Derivatives
Authors: Liu Yong‐Jun , Liu Ying , Zhao Xian , Hu Hai‐Quan , Zhang Dong‐Ju , Liu Cheng‐Bu 
Published: September 2010

AbstractOn the basis of ZINDO program, we have designed a program to calculate the nonlinear second‐order polarizability βyk and βμ according to the SOS expression. The second‐order nonlinear optical properties of 4‐nitro‐4′‐dimethylamino‐stilbene and a series of its thiazole derivatives were studied. The calculated results were that: When replacing a benzene ring in 4‐nitro‐4′‐dimethylamino‐stilbene by a thiazole ring, the influence on β values depends on the position of thiazole ring. When the thiazole ring connects with nitro group (acceptor), the β values increase significantly compared with corresponding stilbene derivatives. The β values of 2‐(p‐donor‐β‐styryl)‐5‐nitro‐thiazole derivatives (2–7) are larger than those of 2‐(p‐nitro‐β‐styryl)‐5‐donor‐thiazole derivatives (8–13) and 2‐(p‐donor‐phenyl)‐azo‐5‐nitro‐thiazole derivatives (14–19). The 2‐(p‐donor‐β‐styryl)‐5‐nitro‐thiazole derivatives (2–7) are good candidates as chromophores duo to their high nonlinearities and potential good thermal stability.
Novel ent ‐Kaurane Diterpenoids from Isodon xerophilus
Authors: Hou Ai‐Jun , Yang Hui , Liu Yan‐Ze , Zhao Qin‐Shi , Lin Zhong‐Wen , Sun Han‐Dong 
Published: September 2010

AbstractFurther investigation on the leaves of Isodon xerophilus afforded three novel ent‐kaurane diterpenoids, xerophilusins D‐F (1–3), together with seven known compounds, phyllostachysin A (4), oleanolic acid, caffeic acid, rosmarinic acid, rutin, quercetin‐3‐O‐β‐D‐glucopyranoside, and quercetin. Structures of 1–3 were elucidated on the basis of their spectral properties and X‐ray crystallographic analysis. Compound 1 showed broad spectra inhibiting human tumor cells and significant cytotoxicity.
Allylation of Diselenides, Aldehydes and Ketones with Ytterbium/Allyl Bromide System
Authors: Su Wei‐Ke , Zhang Yong‐Min , Li Yong‐Shu 
Published: September 2010

AbstractIn the presence of methyliodide, ytterbium can react with allyl bromide smoothly to form allylytterbium bromide, which further reacts with diselenides, aldehydes and ketones to afford allylselenides and homoallylic alcohols respectively in good yields under mild and neutral conditions.
Mechanistic Insights into an Unexpected Carbon Dioxide Insertion Reaction through the Crystal Structures of Carbamic Diphenylthiophosphinic Anhydride and l‐[(4‐Nitrophenyl)‐sulfonyl]‐trans‐2,5‐pyrrolidinedicarboxylic Acid Methyl Ester
Authors: Shi Min , Shen Yu‐Mei , Jiang Jian‐Kang 
Published: September 2010

AbstractThe crystal structures of an unexpected carbon dioxide inserted carbamidiphenylthiophosphinic anhydride and l‐[(4‐nitrophenyl) sulfonyl]‐trans‐2, 5‐pyrrolidinedicarboxylic acid methyl ester were determined by X‐ray analysis. They crystallized in the space group P21(#4) with a =0.9550(2), b = 0.9401(4), c= 1.2880(2) nm, β= 107.74°, V= 1.1013 (5) nm3, Dcaled= 1.349 g/cm3, Z = 2 and P212121(# 19) with a = 1.4666(2), b = 0.7195(2), c = 1.6339(2) nm, V = 1.7240(7) nm3, Dcaled = 1.434 g/cm3, Z = 4, respectively. Through the investigation of these two crystal structures, the mechanistic insights into this unexpected carbon dioxide insertion in the reaction of trans‐2,5‐disubstituted pyrrolidine with diphenylthiophosphoryl chloride in the presence of potassium carbonate were disclosed.