bluuebunny/crossref_metadata_2025_split huggingface dataset:
Y‐Ba‐Cu‐O mixed oxides for production of diphenols in liquid‐solid phase
Authors: Chi‐Biao Liu , Zhen Zhao , Xiang‐Guang Yang , Xing‐Kai Ye , Yue Wu 
Published: September 2010

AbstractSuperconductor mixed oxides were often used as catalysts at higher temperature in gas phase oxidations, and considered not suitable for lower temperature reactions in the liquid‐solid phase; here the catalysis of YBa2Cu3O7±x and Y2BaCuO5±x, in the phenol hydroxylation at lower temperature with H2O2 as oxygen donor was studied, and found that the superconductor YBa2Cu3O7±x has no catalytic activity for phenol hydroxylation, but Y2BaCuO5±x does, even has better catalytic activity and stability than most previously reported ones. With the studies of catalysis of other simple metal oxides and perovskite‐like mixed oxides, a radical substitution mechanism is proposed and the experimental facts are explained clearly, and draw a conclusion that the perovskite‐like mixed oxides with (AO)(ABO3) and (AO)2(ABO3) structure have better catalytic activity than the simple perovskite oxides with (ABO3)3 structure alone, and (AO) structure unit is the key for the mixed oxides to have the phenol hydroxylation activity. No pollution of this process is very important for its further industrial application.
A nonlinear regression model applied to kinetic multi‐component analysis of esters with a SAW‐impedance sensor
Authors: Qing‐Yun Cai , Li Peng , Rong‐Hui Wang , Li‐Hua Nie , Shou‐Zhuo Yao 
Published: September 2010

AbstractA kinetic nonlinear regression model for multi‐component assay of esters was proposed based on their different alkaline‐catalysed hydrolysis rate. The reaction rate was determined by monitoring the conductance change in solution with a liquid‐purpose surface acoustic wave impedance sensor(SAW). The model was tested theoretically and experimentally with the mixture of methyl acetate and n‐propyl acetate. The experimental detection limit of methyl acetate and n‐propyl acetate (within 10 min) was 0.5 μmol/L and 1.0 μmol/L respectively and the recovery of the sensor system ranged from 93% to 106% (n=6).
Heterocyclic compounds from 3‐(4‐phenyl) benzoyl propionic acid
Authors: A.Y. Soliman , H.M. Bakeer , La. Attia 
Published: September 2010

Abstract3‐(4‐Phenyl) benzoyl propionic acid was used as the starting material for the synthesis of furanones (2), pyrrolinones (5), pyridazinones (7), benzoxazinones (8) and quinazolinones (9–11). The behaviour of the derivatives of furanones and benzoxazinones toward different nucleophiles is reported.
Study on the reaction of C60 with DL‐valine and cyclohexanone
Authors: Da‐Gui Zheng , Yu‐Liang Li , Zhong Mao , Dao‐Ben Zhu 
Published: September 2010

AbstractReaction of C60 with DL‐valine and cyclohexanone in refluxing chlorobenzene under N2 yields three [60]fulleropyrrolidine derivatives (mono‐, bis‐and triadduct) which are characterized on the basis of spectroscopies and cyclic voltammetry. It is found that the ratio of the three products greatly depends on the reaction conditions.
Alkylimido osmium(VI) and ruthenium(VI) porphyrins. Crystal and molecular structures of Os(TTP)(O)(NBut)‐ EtOH and OS(4‐C1‐TPP)(NBut)2
Authors: Li Z‐Ying , Che Chi‐Hling 
Published: September 2010

AbstractOxo(tert‐butylimido) or bis(tert‐butylimido)osmium(VI) porphyrins Os(Por)(O)( NBut) and Os(Por)(NBut)2, [Por=meso‐tetrakis(p‐tolyl)porphyrinato (TTP) and meso‐tetrakis(4‐chlorophenyl)porphyrinato (4‐CI‐TPP)] were synthesized by air oxidation of bis(tert‐butylamine)osmium(II) porphyrins [Os(Por)(H2NBut)n (Por=TPP, 4‐C1‐TPP], depending on whether text‐butylamine is present. The bis(tert‐butylamine)ruthenium(II) porphyrins [Ru(Por)(H2NBut)z, Por=TTP, 4‐CI‐TPP] can undergo bromine oxidation to give oxo(tert‐butylimido)ruthenium(VI) complexes in quantitative yields. All these nem complexes were characterized by 1H NMR, UV‐Visible and IR spectroscopy. The X‐ray crystal structures of Os(TTP)(O)(NBut).EtOH and Os(4‐Cl‐TPP)(NBut)2 have been determined. Crystal data: for Os(TTP)(O)(NBu').EtOH: monoclinic, space group P21/c, a=1.3546(6) nm, b=2.3180(3) am, c=1.6817(3) nm, β=90.84(2)°, V=527.97(1) nm3, Z=4. The Os=O and Os=NBut distances in Os(TTP)(O)(NBut).EtOH are 0.1772(7) nm and 0.1759(9) nm, respectively. The average Os=NBut distance of Os(4‐C1‐TPP)(NBut)2 is 0.1775 nm.
Theoretical studies on Lewis acidity scale and bonding character of boron trihalides BX3(X=F, C1, Br, I) by DV‐Xα quantum chemical approach
Authors: Cai Zheng‐Ting , Li Ci‐Ran , Zhang Rui‐Qin , Deng Cong‐Hao 
Published: September 2010

AbstractThe Lewis acidity scale of boron trihalides BX3 (X=F, C1, Br, I) and character of the boron‐halogen bonds have been studied by means of DV‐Xm approach. Present results show that the acid strength of boron trihalides increases in the order BF3<BCl3<BBr3<BI3, in excellent agreement with experiments. Based on boron‐halogen bonding character, the valence of boron atom in boron compounds can be considered M equal to five instead of three which seems to be more reasonable.
Studies on synthesis and kinetics of thermodecomposition of the nickel(II) compounds with Schiff base derived from amino acids
Authors: Li Shu‐Lan , Liu De‐Xin , Yang Zhao‐He 
Published: September 2010

AbstractMonoaqua salicylaldehyde‐o‐aminobenzoic acid Ni(II) monohydrate (cpl) and monoaqua o‐vanillin‐o‐aminobenzoic acid Ni(II) monohydrate (cp2) were synthesized. The composition and structures of these two compounds were analyzed. Their thermal stability and non‐isothermal kinetics were also investigated by use of TG and DTG curves. The possible reaction mechanisms in their first steps of thermal decomposition reactions were deduced by means of integral and differential methods. Thermodecomposition kinetic equations of the compounds are as follows:magnified image
Studies of the dissociation and the protonation of TB‐chlorosulphophenol
Authors: Zhu Chuan‐Zhmg , Yang Bao‐Lin , Zhao Hong , Gu Wen‐Xiu , Ai Shi‐Yun 
Published: September 2010

AbstractThe dissociation constant of each step for TB‐chlorosulphophenol has been determined by potentiometric method, and the thermodynamic constants. ΔG°, ΔH° and ΔS°, of the dissociation p‐ have been calculated. The protonation constants were measured by the spectrophotometric method. The pH values of various forms of anions of the chromogenic reagent at their concentrations were also calculated.
Comparative studies on the mechanism of uridine phosphorolysis
Authors: Zhao Shan‐Rong , Chen Kai‐Xian , Jiang Hus‐Liang , Wang Qin‐Mi , Ji Ru‐Yun 
Published: September 2010

AbstractWe have used quantum mechanical method to study the transition states(TSs) of uridine phosphorolysis reaction. Comparing the four different reaction pathways and the five transition states obtained, we conclude that enzymatic uridine phosphorolysis takes place mainly according to acid‐catalyzed Sn2 mechanism. The proposed reaction pathway is consistent with many experimental results.
Electrodeposition mechanism of NiMoP alloy in the solution of ammoniac citrate
Authors: Zeng Yue , Yao Su‐Wei , Cao Xue‐Qiang , Huang Hong‐Xin , Zhong Zi‐Yi , Guo He‐Tong 
Published: September 2010

AbstractThe induced codeposition mechanism of Mo, P and Ni from the solution of ammoniac citrate was studied by means of steady‐state polarization, AC impedance and X‐ray Photoelectron Spectroscopy (XPS). The result of electrochemical measurements proved that [NiCit(NHs)2]‐ is the electro‐active species of nickel, though nickel ions exist mainly as [NiCit(NH3)3]− in ammoniac citrate. XPS experiments proved the existence of tetravalent molybdenum corresponding to MoO2 on the surface of mme deposits. The intermediate product, MoO2, WM probably reduced to Mo in the alloy deposit by atomic hydrogen adsorbed on the induced metal nickel. The reduction of H2PO−2 occurs through two distinctive steps with PH3 an an intermediate, which subsequently reacts with atomic hydrogen to form P in the alloy deposit. The electrodeposition mechanism was proposed in this paper.
Electronic factor in electron self‐exchange reaction of hydrated redox ion pairs from thermodynamic data
Authors: Bu Yu‐Xiang , Deng Cong‐Hao 
Published: September 2010

AbstractAn accurate scheme for determining the electronic factor of the electron self‐exchange reaction in solution is presented in this paper. The wed various activation parameters and slopes of potential energy surfaces are obtained in terms of an improved activation model and the accurate potential function determined from the vibrational spectroscopic and thermodynamic data. The coupling matrix elements are determined using numerical integral method over the perturbed double‐zeta Slater‐type state functions. Theoretical results of electronic factor in this work an found in close agreement with those extracted from experimental rate constant data and to be less than unity. Results indicate that outer‐sphere electron transfer reactions in solution involving hydrated transition metal ions are nonadiabatic in nature.
Time‐dependent treatment of intramolecular energy transfer for HeICl complex
Authors: Zhao Xian , Bu Yu‐Xiang , Wu Ai‐Ling , Guan Da‐Ren 
Published: September 2010

AbstractThe time‐dependent golden wave packet method has been used for calculating the decay widths of vibrational predissociation for HeICl complex in the B state with total angular momentum J=0. This is a good example of intramolecular energy transfer. We examine the dependence of the final rotational distribution (partial decay width) of ICI fragment on the stretching excitation. It is found that computed final rotational distributions are weakly dependent on the vibrational level being excited. Unlike the smoothly varying rotational distribution for lower initial vibrational levels, for higher initial vibrational levels the rotational distribution indicates the very pronounced oscillatory structure. The analysis of the rotational distribution as a function of propagation time reveals the predominant role of the final states interaction in determining the final rotational distribution.
A strategy to improve the accuracy of digital simulation for electroanalytical chemistry
Authors: Fang Hui , Chen Hong‐Yuan 
Published: September 2010

AbstractA strategy for digital simulation methods was presented for solving partial differential equations, called as IPBFP which is to insert M points before the first time point of the usual way, to decrease simulation errors. The theoretical analysis and simulation results show that it can improve the fully implicit method with any dimensionless diffusion coefficient λ, Crank‐Nicolson method with large λ and Saul'yev method with small λ. The IPBFP in convenient to arrange the simulation time points flexibly and reduce calculation time and errors. This approach can combine the merits of non‐uniform time grid and uniform time grid methods in simulation for electrochemical studies.
Semiconductor photoinduced cycloreversion of the dimer of methyl 2‐naphthoate
Authors: Tung Chen‐Ho , Ying Yun‐Ming 
Published: September 2010

AbstractThe dimer of methyl 2‐naphthoate (1) has been found to undergo efficient cycloreversion to its monomer, methyl naphthalene‐2‐carboxylate (2) on illuminated ZnO and TiO2 but not on CdS An electron transfer and cation radical chain mechanism is proposed. Quantum yields, solvent effect., the role of oxygen, and the quenching of the reaction were investigated, and were consistent with the proposed mechanism.
Crystal structure of the complex of trichosanthin with NADPH at 0.172 nm resolution
Authors: Xiong Jim‐Ping , Xu Zong‐Xiang , Wang Yu 
Published: September 2010

AbstractThe orthorhombic crystal structure of the complex of trichosanthin with nicotinamide adenine dinucleotide phosphate has been determined by molecular replacement method using one of the molecules of the monoclinic crystal structure of trichosanthin at 0.27 nm resolution as the search model. The crystallographic refinement at 0.172 nm resolution led to a final R‐factor of 17.4% with root‐mean‐square deviations of 0.0013 nm and 3.8° from the ideal bond lengths and bond angles, respectively. The quality of the structure, the polypeptide chain fold and the comparison of it with that of the monoclinic trichosanthin structure, the location of nicotinamide adenine dinucleotide phosphate, the active site structure as well as the solvent structure are described.
A “one‐pot” synthesis of α‐(p‐toluenesulfonyl)‐aminobenzylphosphinodipeptide derivatives containing a PN bond
Authors: Dai Qing , Chen Ru‐Yu 
Published: September 2010

AbstractWith acetyl chloride as the solvent, the condensation reaction of p‐toluenesulfonamide, an aromatic aldehyde and phenyldichlorophosphine given a reactive intermediate, α‐(p‐toluenesulfonyl)‐aminobenzylphosphinic chloride, which reacts with glycine ethyl ester to give the corresponding phosphinopeptide (6) containing a PN bond directly.
Ab initio band structure calculations on polymers (C5H3X)n (X = CH, N, P, As)
Authors: Lin Chen‐Sheng , Li Jun , Liu Chun‐Wan 
Published: September 2010

AbstractThe ab initio crystal orbital calculations on conjugated aromatic six‐membered rings polymers, namely, poly(p‐phenylene) (PPP), poly(2,5‐pyridinediyl) (PPD), poly(2,5‐phosphabenzene) (PPB) and poly(2,5‐arsabenzene) (PAB) are reported. The comparison of the important electronic properties of these polymers, such as band gap, bandwidth, ionisation potential and electron affinity, indicates that PPP is the best intrinsic semiconductor, and PPD has the best prospects for forming n‐doped conducting materials.
Spectroelectrochemical studies of [Mo(dtc)4][Eu(dtc)4] and [Mo(dtc)4][Er(dtc)4]
Authors: Zhao Yu‐E , Fu Qing‐Hong , Zhang Heng‐Bin , Li Shu‐Jia , Sun Chun‐Ting , Sun Chia‐Chung 
Published: September 2010

AbstractRedox and spectroscopic properties of the eight‐coordination complexes of molybdenum and the rare‐earth elements Eu or Er with N, N‐diethyldithiocarbamate (dtc) were characterised by cyclic voltammetry and UV‐visible absorption spectra. The complex cation [Mo(dtc)4]+ is more stable than the complex unions [Eu(dtc)4]− and [Er(dtc)4]− in redox processes, and possesses good redox reversibility. The electron transfer number, formal standard electrode potential in the redox process for the complex cation and its diffusion coefficients were obtained by in situ spectroelectro‐chemistry.
Luminescence properties of sol‐gel derived silica gels doped and undoped with RE‐complexes(RE=Eu, Tb)
Authors: Lin Jun , Li Bin , Zhang Hong‐Jie 
Published: September 2010

AbstractThe luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)3 and Tb(o‐CBA)3 (TTA=thenoyltrifluocetate, o‐CBA=o‐chlorobenzoic acid) are reported and discussed. Pure silica gels show a blue luminescence, and the maximum excitation and emission wavelengths depend strongly on the solvents used. Both of the studied rare earth complexes exhibit the characteristic emissions of the rare earth ions in silica gels, i.e., Eu3+ 5D0 → 7 FJ (J = 0, 1, 2, 3, 4), Tb3+ 5D4 → 7 FJ (J = 3, 4, 5, 6) transitions. Compared with the pure RE‐complexes powder, the silica gels doped with RE‐complexes show fewer emission lines of the rare earth ions. Furthermore the rare earth ion (Tb3+) presents a longer lifetime (1346 μs) in silica gel doped with Tb(o‐CBA)3 than in pure Tb(o‐CBA)3 powder (744 μs). The reasons responsible for these results are discussed in the context.
Synthesis and magnetic studies of phthalato‐bridged oxovanadium(IV) binuclear complexes
Authors: Yan Cui‐Wei , Li Yan‐Tuan , Han Qing‐Kui , Liao Dai‐Zheng 
Published: September 2010

AbstractSix new μ‐phthalato binuclear oxovanadium(IV) complexes, namely [(VO)2(PHTH)‐(L)2]SO4 (L denotes 2,2′‐bipyridine (bpy); 1,10‐phenanthroline (phen); 4,4′‐dimethyl‐2,2′‐bipyridine (Me2 bpy); 5‐nitro‐1,10‐phenanthroline (NO2‐phen); 5‐chloro‐1,10‐phenanthroline (Cl‐phen) and 5‐methyl‐1,10‐phenanthroline (CH3‐phen), where PHTH is the phthalate dianion), have been synthesized and characterized by elemental analyses, IR, electronic spectra, magnetic moments at room temperature and molar conductivity measurements. The temperature dependence of the magnetic susceptibility of complexes [(VO)2(PHTH)(phen)2]SO4 (1) and [(VO)2(PHTH)(CH3‐phen)2]SO4 (2) was measured in 4—300 K range and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, Ĥ=−2JŜ1·Ŝ2, giving the exchange integrals J=−12.8 cm−1 for 1 and J=−7.9 cm−l for 2. This indicates an antiferromagnetic spin‐exchange interaction between the metal ions within each molecule.
Molecular modeling of rice Rubisco
Authors: Dai Wei‐Wen , Jiang Guo‐Fang , He Yong‐Ning , Xia Zong‐Xiang 
Published: September 2010

AbstractMolecular model of rice Rubisco has been constructed by molecular modeling method on a computer graphics workstation using graphics software TOM‐FRODO and QUANTA/CHARMm, based on the three‐dimensional structure of spinach Rubisco. The molecular modeling was carried out in the following procedure: amino‐acid sequence substitution; manual adjustment of the initial model; and energy minimization. The three‐dimensional structure of the quaternary complex Rubisco‐CO2·Mg2+·CABP of rice Rubisco has also been modeled and optimized using the program package XPLOR. The main‐chain structure of rice Rubisco does not show obvious difference from that of spinach Rubisco, and the side‐chains are located in the most favorable positions and orientations. The active‐site structures are basically the same for the two species. The mutant Leu335→Arg of rice Rubisco has been designed using the graphics software TURBO‐FRODO and the program package XPLOR. Energy computation suggests that this mutation might increase the carboxylation activity.
Preparation and antibacterial activity of aromatic derivatives of β‐aminopropionic and γ‐aminobutyric acid
Authors: Guan Jing‐Qu , Hu Zun‐Ju , Zou Zhi‐Cben , Wu Zhi‐Guang 
Published: September 2010

AbstractTen aromatic derivatives of β‐aminopropionic acid and γ‐aminobutyric acid were prepared. Their compositions and structures were identified by elemental analysis, IR, and 1H NMR. They haw been examined for their antibacterial action against Staphylococcus aureus and Escherichia coli. These compounds showed higher activity than the aromatic derivatives of α‐amino acid which were reported previously. The general conclusion to be drawn is that the distance between amino and carboxylic group in these molecules could affect their antibacterial activity. Furthermore, those compounds with p‐methyl substituent in phenyl ring exhibit higher activity than the others, and all the compounds exhibit higher activity against Escherichia coli and against Staphylococcus aureus.
Synthesis of ribonucleoside analogues containing thio‐substituted 1,3,4‐triazole as heterocyclic base
Authors: Ding Yun , Zhang Jiong , Chen Yao‐Quan 
Published: September 2010

AbstractNew ribonucleoside analogues containing thio‐substituted 1,3,4‐triazole as heterocyclic base have been synthesized via condensation of the central intermediate 1 with various acids, esters, amides, and anhydrides in anhydrous solvent followed by deprotection.
Conformational changes and surface binding property of rat liver Cd5Zn2‐metallothionein
Authors: Huang Zhong‐Xian , Gu Wei‐Qiang , Zheng Qi , Liu Fang , Sun Yao‐Jun 
Published: September 2010

AbstractA series of conformational changes of native rat liver metallothionein were observed under different ionic strength by1H NMR. Furthermore, binding of magnetic probes to MT gives us an implication that positively charged groups of lysine are not completely folded back towards the inner core of metallothionein, the negatively charged metal‐sulfur core is slightly exposed to the solvent.
A dinuclear molybdenum cluster containing i‐mnt ligand: Synthesis and crystal structure of [Mo2S4(i‐mnt)2] (Et4N)2
Authors: Sun Fu‐Xia , Lu Shao‐Fang , Wu Qiang‐Jin , Huang Xiao‐Ying 
Published: September 2010

AbstractA dinuclear molybdenum(V) cluster compound (Et4N)2[Mo2S4(i‐mnt)2] (i‐mnt=1,1‐dicyanoethylene‐2,2‐dithiol, [S2C=C(CN)2]2‐) has been prepared by the ligand substitution reaction of Mo2S4(iso‐pr2dtp)2 (iso‐pr2dtp=S2P(OC3H7)2−) with K2(i‐mnt) in the presence of Et4NI. This cluster was characterized by infrared spectrum, UV‐Vis spectrum and single crystal structure analysis. The cluster union [Mo2S4(i‐mnt)2]2‐ possesses Cs, symmetry with a crystallographic mirror plane through two bridging S atoms. By the S …︁ S supramolecular interactions between two adjacent cluster anions the [Mo2S4(i‐mnt)2]2‐ anions are linked to form infinite chains along the b axis. Crystal data: monoclinic, space group C2/m, a=1.8748(6), b=1.5380(4), c=1.4322(5) nm, β=112.02(2)°, V=3.823(4) nm3, Z=4, Dc=1.50 g/cm3. The final R=0.038 and Rw=0.053 for 3015 observed unique reflections.
27‐Ald‐triterpenoid saponins from Adina rubella
Authors: Fan Gae‐Jun , He Zhi‐Sheng , Wu Hou‐Ming , Xu Jing‐Fei 
Published: September 2010

AbstractFour new triterpenoid saponins were isolated from the roots of Adina rubella Hance. They were characterized as adinaic acid 3β‐[α‐L‐rhamnopyranosyl(1→2)‐β‐D‐glucopyranosyl(1→2)‐β‐D‐glucurono‐pyranoside‐6‐O‐methyl ester]‐2‐O‐β‐D‐glucopyranoside, adinaic acid 3β‐O‐[a‐L‐rhamnopyranosyl(1→2)‐β‐D‐glucopyranosyl(1→2)‐β‐D‐glucuronopyranosid‐6‐O‐butyl ester]‐28‐O‐β‐D‐glu‐copyranoside, adinaic acid 3β‐O‐[β‐D‐glucopyranosyl(1→2)‐β‐D‐glucopyranosyl]‐(28→ l)‐β‐D‐glucopyranosyl(1→6)‐β‐D‐glucopyranosyl ester, 27‐hydroxyursolic acid 3β‐O‐[α‐L‐rhamnopyranosyl (1→ 2)‐β‐D‐glucopyranosyl(1→2)‐β‐D‐glucuronopyranoside‐6‐O‐methyl ester]‐28‐O‐β‐D‐glucopyranoside. Their structures wen elucidated by spectral methods, specially with the aid of 2D NMR techniques. Their complete assignments of the 1H and 13C NMR signals were carried out.
Synthesis and spectroscopic properties of a novel zinc phthalocyanine with four 17‐membered crown ether voids
Authors: Xiong Guo‐Xiang , Shen Shu‐Yin , Ye Jian‐Ping , Zhou Qing‐Fu , Xu Hui‐Jun 
Published: September 2010

AbstractA novel zinc phthalocyanine containing four 17‐crown‐5 ether voids(17C5ZnPc) has been synthesized and characterized. UV‐visible absorption and fluorescence emission spectra and as sociated photophysical parameters have been determined. In contrast to most of the crown ether substituted phthalocyanines, no cofacial dimer formation is observed in the presence of alkali metal salts. In addition to the fluorescence at 710 nm from S1, a strong upper excited state (Soret S2) emission around 424 nm has been detected for the first time in the phthalocyanine series. Fluorescence decay of S1 and S2 emission can be analyzed by mono‐ and biexponential fits respectively. X‐ray structure analysis showed that the crown ether unit is conformationally deformed and oblate that may account for the unusual spectroscopic properties.
Synthesis of new heterocycles 1,3,2,6‐dioxaphosphaselenacyclooctanes
Authors: Li Jin‐Liang , Tian Bing , Zhao Chang‐Qiu , Wang Yong‐Mei , Meng Ji‐Ben , Wang Hong‐Gen 
Published: September 2010

AbstractNew phosphorus‐ and selenium‐containing heterocycles, 1,3,2,6‐dioxaphosphaselenacyclooctanes (1a—1h), were synthesized by the reaction of bis(2‐hydroxyethyl)selenide with RP(X)Cl2 whore R=alkoxyl, aroxyl, aryl and X=O or lone pair. Their structures were determined by spectroscopies and elemental analyses and finally confirmed by the X‐ray crystallographic analysis of 1c. The molecular structures of the heterocycles were discussed in term of conformational analysis.
A new series of chiral catalysts for the enantioselective borane reduction of ketones
Authors: Shen Zong‐Xuan , Zhang Ya‐Wen , Lu Jun , Xu Xue‐Nong , Lu Cheng‐Rong 
Published: September 2010

AbstractA new series of 1,3,2‐oxazaborolidine catalysts substituted in position 4 by the (CH3)3C(CH2)n group (n=2, 3, 4, 5) were synthesized and applied to the borane reduction of prochiral ketones. The relationship between catalyst structure and enantioselectivity was discussed.