bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Efficient Mg/Sml2 Catalytic System for the Intermolecular Deoxygenative Coupling of Amides and Ketones
Authors: Xu Xiao‐Liang , Zhang Yong‐Min 
Published: September 2010

AbstractThe intermolecular deoxygenative coupling of ketones with amides induced by Mg/Sml2 catalyst was studied and a series of enamines was synthesized in moderate yields under mild and neutral conditions.
Self‐assembled Monolayers of n‐Hexadecanoic Acid and α‐Hydroxyl n‐Hexadecanoic Acid on Titanium Surfaces
Authors: Chen Hai‐Gang , Wu Xue‐Dong , Yu Qin‐Qin , Yang Sheng‐Rong , Wang Da‐Pu , Seen Wen‐Zhong 
Published: September 2010

Abstractn‐Hexadecanoic acid (HA) and α‐hydroxyl n‐hexadecanoic add (HHA) are shown to spontaneously assemble on Si‐supported titanium surfaces. Contact angle measurements, reflection absorbance IR, AFM and XPS characterizations are performed to examine the physical and chemical states of attached monolayers. The results show that the two amphiphiles tend to form disordered monolayers on titanium surfaces. The HHA headgroups are believed to form polydentate coordination with Ti, which is more chemically stable than the bidentate coordination of HA. All the facts of characterization indicate that HHA monolayer has more surface coverage than HA monolayer.
A Novel Self‐assembled Supramolecular Complex {[Cu(n) (en)2·H2O] [Cu(I)2(CN)4]}n with Honeycomb‐like Structure and Its Adsorption Properties
Authors: Shen Xiao‐Ping , Zou Jian‐Zhong , Li Bao‐Long , Hu Huai‐Ming , Xu Zheng 
Published: September 2010

AbstractA novel supramolecular complex {[Cu(n)(en)2·H2O]·[Cu(I)2(CN)4]}n (en = ethylenediamine), in which the cyanide‐bridged Cu(I) forms the honeycomb‐like skeleton host and the Cu(n) complex ion [Cu(en)2·H2O]2+ is encapsulated in the center of the channel cavity of the skeleton, was synthesized by two different methods. The complex was also characterized by elemental analysis, ICP analysis, IR spectra and thermal analysis. The adsorption and desorption studies of the complex indicate that H2O and NH3 can be desorbed and re‐adsorbed without collapse of the channel structure of the supramolecule.
Chemoselective Benzylation and Allylation of 4‐Nitrobenzaldehyde Promoted by Phase Transfer Catalyst and Metal in Aqueous Media
Authors: Zha Zheng‐Gen , Xde Zhen , Zhou Cun‐Liu , Wang Zhi‐Yong , Wang Yu‐Song 
Published: September 2010

AbstractThe benzylation and allylation of 4‐nitrobenzaldehyde (1) could be controlled chemoselectively by using different phase transfer catalyst (FTC) and different metal catalysts. And then, benzylation and allylation of 1 with various organic halides has been realized in high yields in aqueous media.
Study on Oxidation Mechanism of Nitrogen Monoxide in Indoor Environment
Authors: Zheng Dan , An Cong‐Jim , Yang Bo , Ding Zong‐Zhou 
Published: September 2010

AbstractWith the aid of wind‐tunnel experimental setup, the possibilities that nitrogen monoxide (NO) is oxidized to nitrogen dioxide (NO2) in various environments were studied, which include indoor, outdoor and darkroom conditions. By comparing their effects, a conclusion can be drawn that NO can be oxidized to NO2 in indoor environment with a low rate, and micro amount of ozone, propylene and methane can accelerate the reaction: 2NO+ O2·NO2. The initial concentration of NO has effect on the oxidation rate. When the initial concentration of NO ranges between 500 and 900 μg/L, natural logarithm of initial rate and natural logarithm of initial concentration have a good linear relation, so do m(1/[NO]) and the time (t). Besides mat, the possible oxidation mechanism of indoor NO has also been studied.
Study on the Model for Regulation of the Allosteric Enzyme Activity
Authors: Li Qian‐Zhong , Luo Liao‐Fu , Zhang Li‐Rong 
Published: September 2010

AbstractThe effects of activator molecule and repressive molecule on binding process between allosteric enzyme and substrate are discussed by considering the heterotropic effect of the regulating molecule that binds to allosteric enzyme. A model of allosteric enzyme with heterotropic effect is presented. The cooperativity and anticooperativity in the regulation process are studied.
Synthesis and Characterization of 2,6‐Bis(imino)phenoxy Cobalt Complexes
Authors: Han Ling‐Qin , Sun Wen‐Hua , Wang Le‐Yong , Shao Chang‐Xing , Wang Hong‐Gen , Li Ji‐Tai 
Published: September 2010

AbstractA series of cobalt complexes bearing 2,6‐bis(imino) phenoxy ligands, LCoCl2[L = 2,6‐(ArNCH)2CH3C6H2OH] was synthesized by the reaction of the ligand 2,6‐bis (imino) phenol with the equivalent mole of cobalt dichloride, and these complexes were characterized by elemental analyses,1H NMR, MS and IR spectra. The structure of one complex was determined by single crystal X‐ray diffraction analysis.
Study on the Gas Phase Stability of Heme‐binding Pocket in Cytochrome Tb5 and Its Mutants by Electrospray Mass Spectrometry
Authors: Yu Chong‐Tian , Guo Yin‐Long , Lü Long , Wang Yun‐Hua , Yao Ping , Huang Zhong‐Xian 
Published: September 2010

AbstractTo elucidate the effect of various amino add residues on the heme‐binding pocket in cytochrome Tb5, several residues were chosen for replacement by means of site‐directed mutagenesis. Comparison of the mass spectrum between the F35Y mutant and the wild type shows that the relative abundance of holoprotein ion of F35Y is lower than that of the wild type in gas phase. It is concluded that mutation from Phe35 residue to tyrosine decreases the hydrophobic character of cytochrome Tb5 heme pocket, which decreases the stability of heme‐binding pocket. ESI‐MS spectra of the mutants V61E, V61K, V61H and V61Y show various contribution of amino acid to the stability of heme‐binding pocket. The small and non‐polar residue Val61 was replaced with large or polar residues, resulting in enhancing the trend of heme leaving from the pocket. In addition, comparison of the mass relative abundance of holo‐proteins among all the Vakil‐mutants, shows mat their stability in gas phase appropriately submit the following order: wild type > V61H > V61E > V61K ≈︁ V61Y. The extra great stability of quadruple sites mutant E44/48/56A/D60A shows that reduction of electrostatic or hydrogen bond interactions among the residues locating in the outside region of the heme edge remarkably affect the stability of heme. The results of analyzing the oxidation states of heme iron in Tb5 and its mutants by insource‐CAD experiment suggest that the charge states of heme iron Maintain inflexible in mutation process.
Resonance Rayleigh Scattering Method for the Determination of Raloxifene with Evans Blue
Authors: Fan Li , Liu Shao‐Pu , Yang Da‐Cheng , Hu Xiao‐Li 
Published: September 2010

AbstractThe intensity of resonance Rayleigh scattering (RRS) of Evans blue (EB) or raloxifene hydrochloride (Ralo) is very weak, but it can be enhanced significantly and a new RRS spectrum appears when both of them interact to form an ion‐association complex in sodium acetate‐hydrochloric acid buffer solution at pH 1.8. The intensity of RRS is directly proportional to the concentration of Ralo in the range of 0–8.3 μg · mL−1, and the detection limit for Ralo (σ = 3) is 18.9 ng·mL−1. The method has high sensitivity and fairly good selectivity. Based on the above evidences, a new facile method for the determination of trace amount of Ralo has been established with satisfactory results.
A Novel Polybrene/Chondroitin Sulfate C Double Coated Capillary and Its Application in Capillary Electrophoresis
Authors: Du Ying‐Xiang , Honda Susumu , Taga Atsushi , Liu Wen‐Ying , Suzuki Shigeo 
Published: September 2010

AbstractA new capillary coated by double polymer, polybrene/chondroitin sulfate C (P/CC), was developed using a simple procedure. The P/CC double coated capillary showed long lifetime, strong chemical stability and good reproducibility. It endured during more than 100 replicated analyses and was also tolerant to HCl (1 mol/L), NaOH (0.01 mol/L), CH3OH and CH3CN. The P/CC double coated capillary can be applied to basic drug analyses. The adsorption of basic drugs to the capillary wall was suppressed and the peak tailing greatly decreased. The use of the P/CC double coated capillary allowed excellent separation of the enantiomers of some basic drugs by using chondroitin sulfate C as the chiral selector, and the peak symmetry of basic drugs was further improved under these conditions.
Synthesis of 2‐Benzylthio‐5‐phenyl‐3,4‐disubstituted Thiophenes by Intramolecular Condensation of α‐Oxo Ketene Dibenzyl‐thioacetals
Authors: Wang Mang , Ai Lin , Zhang Ji‐Yu , Liu Qun , Gao Lian‐Xun 
Published: September 2010

AbstractA facile route to 2‐benzylthio‐5‐phenyl‐3,4‐disubstituted thiophenes was described. Catalyzed by sodium hydroxide, the title compounds were synthesized in moderate to good yields simply from the intramolecular aldol type condensation of α‐oxo ketene dibenzylthioacetals. The chemical selectivity for this annulation reaction was studied and discussed.
Synthesis, Mechanism of Formation and Insecticidal Activity of Novel Fluorinated Organophosphorus Compounds
Authors: Wu Jun , Hudson Harry R. 
Published: September 2010

AbstractThe major products of the interaction between triethyl phosphite and 3‐fluoropropanoyl chloride at room temperature are diethyl (E)‐1‐(3‐fluoropropanoyloxy)‐3‐fluoroprop‐1‐enylphosphonate (3) and diethyl l‐(diethoxyphosphoryl)‐3‐fluoropropyl phosphate (4). The compounds 3 and 4 were separated by chromatography, and structurally characterized by elemental analysis, NMR spectroscopy (1H, 13C, 19F and 31P) and mass spectrometry. Possible reaction mechanisms are proposed. The major products 3 and 4 were tested for insecticidal activity. 3 gave 100% control of Musca domestica L. and Phaedon cochledriae Fab. at a dose of 20 μg/per insect.
Synthesis, Properties and Crystal Structure of Seven‐coordinated Organotin Complex [nBu2Sn(OOCC5H4N‐2)2(H2O)]
Authors: Yin Han‐Dong , Wang Chuan‐Hua , Ma Chun‐Lin , Wang Yong 
Published: September 2010

AbstractA novel seven‐coordinated organotin complex [nBu2Sn‐(OOCC5H4N‐2)2(H2O)] was unexpectedly synthesized by reaction of nBu3SnCl with 2‐pyridinecarboxylic acid in 1:1 molar ratio in the presence of organic base Et3N. The crystal structure was determined by single crystal X‐ray diffraction analysis. The crystal belongs to rhombohedral with space group R‐3c, a = 1.5807(3) nm, b = 1.5807(3) nm, c = 1.5807(3) nm, α = 105.717(2)°, β = 105.717(2)°, γ = 105.717(2)°, Z = 6, V = 3.397(8) nm3, Dc = 1.452 g/cm3, μ = 1.158 mm−1, F(000) = 1512, R1 = 0.0447, wR2 = 0.1038. In crystal, the tin atoms rendered seven‐coordinate in a distorted pentagonal bipyramidal geometry. The two‐dimensional network structure was formed by H‐bonding interaction between the free oxygen atoms of carboxyl groups and the coordinated water molecules.
A New Approach on the Active Treatment for Electroless Copper Plating on Glass
Authors: Zheng‐Chun Liu , Quan‐Guo He , Jian‐Xin Tang , Peng‐Feng Xiao , Nong‐Yue He , Zu‐Hong Lu 
Published: September 2010

AbstractA new method is described for the electroless deposition of copper onto glass. Commercially available glass slide was modified with μ‐amimopropyltrimethoxysilane to form self‐assembled monolayer (SAM) on it. Then it was dipped directly into PdCl2 solution instead of the conventional SnCl2 sensitization followed by PdCl2 activation. Experimental results showed that the Pd2+ ions from PdCl2 solution were coordinated to the ammo groups on the glass surface resulting in the formation of N—Pd complex. In an electroless copper bath containing a formaldehyde reducing agent, the N—Pd complexes were reduced to Pd0 atoms, which then acted as catalysts and initiated the deposition of copper metal. Although the copper deposition rate on SAM‐modified glass was slow at the beginning, it reached to that of conventional method in about 5 min.
Lipases‐Catalyzed Alcoholysis for the Preparation of Chiral 1‐ or 2‐Hydroxyalkanephosphonates
Authors: Yong‐Hui Zhang , Jin‐Feng Li , Ke Wang , Cheng‐Ye Yuan 
Published: September 2010

AbstractEnzymatic alcoholysis has been developed for the preparation of some chiral 1‐ and 2‐hydroxyalkanephosphonates with high optical purity. This method ensures the convenient access to the optically pure phosphocarnitine, phosphogabob and phosphomycin.
Oxidative Splitting of a Pyrimidine Cyclobutane Dimer: A Pulse Radiolysis Study
Authors: Li‐Qin Yan , Qin‐Hua Song , Xiao‐Ming Hei , Qing‐Xiang Guo , Wei‐Zhen Lin 
Published: September 2010

AbstractThe oxidative splitting process of cis‐syn 1,3‐dimethyluracil cyclobutane dimer (DMUD) in aqueous solution was investigated using pulse radiolysis technique. The results indicated that DMUD can be splitted into 1,3‐dimethyluracil (DMU) by OH radicals (OH·) and Br2 radical anions (Br·2−), but not by azide radicals (N·3). The oxidative mechanisms that an H‐abstracted from DMUD for OH· oxidative splitting and an electron transfer from DMUD to Br·2−, were suggested. Related kinetic parameters were determined.
Synthesis, Structure and Optical Properties of Cupro‐8‐thioquinoline Coordination Polymer, [CuI (C9H6NS)]n
Authors: Guo‐Hong Zhang , Ping Wang , Hong‐You Guo , Nian‐Zu Wu , Xiang‐Lin Jin 
Published: September 2010

AbstractA Cupro‐8‐thioqinoline coordination polymer, [CuI (C9H6NS)]n, was synthesized by methano‐thermal reaction of CuCl and 8,8′‐dithiodiquinoline (dtdq) in a molar ratio of 2:1 at 160°C for 7 d. X‐Ray single crystal structure determination revealed the formation of a one‐dimensional structure belonging to monoclinic crystal system, space group P21/c with cell parameters a = 0.8043(1) nm, b = 1.8949(3) nm, c = 1.1048(1) nm, β = 110.109(4)°, V = 1.5810(4) nm3 and Z = 4. The crystal was found to be stable up to approximately 300°C by thermal analysis and have an energy gap (Eg) of 2.0 eV exhibited by UV‐Vis‐NIR reflectance spectrum.
Novel Chiral Aminophosphine Ligand: Synthesis and Application in Asymmetric Catalytic Hydrogenation Reaction
Authors: Yi‐Xin Chen , Yue‐Ming Li , Kim‐Hung Lam , Sun‐Chi Chan Albert 
Published: September 2010

AbstractA new chiral aminophosphine ligand 6,6′‐dimethoxy‐2,2′‐bis(diphenylphosphinoamino) biphenyl (DMBDPPABP) was prepared and its rhodium complex was found to be an effective catalyst for the asymmetric hydrogenation of amidoacrylic add and its derivatives. The effects of solvent and reaction temperature on enantioselectivity were also studied.
Effect of Particle Size and Capping on Photoluminescence Quantum Efficiency of 1,3,5‐Triphenyl‐2‐pyrazoline Nanocrystals
Authors: De‐Bao Xiao , Ztt‐Yum Han , Lu Xi , Li‐Yim Zhao , Wen‐Sheng Yang , Jian‐Nian Yao 
Published: September 2010

AbstractOrganic nanocrystals of 1,3,5‐triphenyl‐2‐pyrazoline (TPP) with a series of sizes were synthesized by reprecipitation method. The luminescence quantum efficiency of TPP nanocrystals increases from 24.2% for the nanocrystals with an average size of 300 nm to 34.6% for those with an average size of 20 nm. Surface capping by polyvinyl pyrrolidone (PVP) will improve the quantum efficiency of TPP nanocrystals. The size‐dependence and capping‐induced variation of the luminescence quantum efficiency was elucidated in viewpoint of aggregation quenching and the equilibrium between the TPP monomers and the aggregates in TPP nanocrystals.
Synthesis and Chiral Recognition of a New Type of Chiral Calix[4]‐arene Derivatives
Authors: Yong‐Bing He , Jian‐Feng Li , Yuan‐Jing Xiao , Lan‐Hua Wei , Xko‐Jun Wu , Ling‐Zhi Meng 
Published: September 2010

AbstractTwo new chiral calix[4]arenes bearing chiral pendants, which were from by‐product of the antibiotic industry, were synthesized and characterized by 1H NMR, MS‐FAB and elemental analysis. Studies of 1H NMR of the two calix[4] arene derivatives indicate that they exist in cone conformation in solution. Results of chiral recognition of the two chiral ligands 2a and 2b towards the tartaric add derivative 3 show that ligand 2a exhibited good chiral recognition abilities compared to ligand 2b.
Hyperbranched Acrylated Aromatic Polyester Used as a Modifier in UV‐Curable Epoxy Acrylate Resins
Authors: Hui‐Guang Kou , Anila Asif , Wen‐Fang Shi 
Published: September 2010

AbstractThe viscosity, the shrinkage degree and the photopolymerization rate of the epoxy acrylate (EB600) blended with hyperbranched acrylated aromatic polyester (HAAPE) were investigated. The addition of HAAPE into EB600 largely reduces the viscosity of the blend formulation and the shrinkage degree. For example, EB600 resin with 50% weight fraction of HAAPE has the 1250 cps of the viscosity and 2.0% of shrinkage degree, while the pure EB600 resin has 3000 cps of the viscosity and 10.5% of shrinkage degree. The photopolymerization rate of the resin is also promoted by HAAPE addition. The good miscibility between HAAPE and EB600 was also observed from the dynamic mechanical analysis. The tensile, flexural and compressive strength, and the thermal properties of the UV cured films are greatly improved.
High Power Density Electric Double Layer Capacitor with Improved Activated Carbon
Authors: Hui Yang , Hui‐Jun Jiang , Tian‐Hong Lu 
Published: September 2010

AbstractThe improvement on commercial activated carbon (AC) through the reactivation under steam in the presence of NiCl2 catalyst leads to the increases of both energy and power densities of electric double layer (dl) capacitors. When AC was treated at 875 °C for 1 h, its discharge specific capacitance increases up to 53.67 F· g−1, an increase of about 25% compared to the as‐received AC. Moreover, a significant increase in high rate capability of electric dl capacitor was found after the improvements. Surprisingly, both the treated and untreated AC samples showed similar specific surface area and pore size distribution, but some changes in the surface groups and their concentrations after reactivation were verified by X‐photoelectron spectra. Thus, it is reasonable to conclude that the decrease in the surface concentration of the carbonyl‐containing species for the improved AC results in an increase of accessibility of the pores to the organic electrolyte ion, causing the enhancements of both the specific capacitance and high rate capability.
Bonding and Mössbauer Isomer Shifts in (Hg, Pb)‐1223 Cuprate
Authors: Fa‐Ming Gao , Yong‐Jun Tian , Yan Chen , Dong‐Chun Li , Hai‐Feng Dong , Si‐Yuan Zhang 
Published: September 2010

AbstractBy using the chemical bond theory of dielectric description, the chemical bond parameters of (Hg, Pb)‐1223 were calculated. The results show that the (Ba, Sr)‐O and Ca—O types of bond have higher ionic character, while the Cu—O and (Hg, Pb)‐O types of bond have more covalent character. Mössbauer isomer shifts of 57Fe and 119Sn doped in (Hg, Pb)‐1223 were calculated by using the chemical environmental factor, he, defined by covalency and electronic polarizability. Four valence state tin and three valence iron sites were identified in 57Fe and 119Sn doped (Hg, Pb)‐1223 superconductor. It can be concluded that all of the Fe atoms substitute the Cu at square planar Cu(1) site, whereas Sn prefers to substitute the square pyramidal Cu(2) site.
Theoretical Study on Gas‐phase Pyrolytic Reactions of N‐Ethyl, N‐Isopropyl and N‐t‐Butyl Substituted 2‐Aminopyrazine
Authors: Li‐Ping Chen , San‐Guo Hong 
Published: September 2010

AbstractDensity functional theory (DFT) and ab initio methods were used to study gas‐phase pyrolytic reaction mechanisms of iV‐ethyl, N‐isopropyl and N‐t‐butyl substituted 2‐aminopyrazine at B3LYP/6–31G* and MP2/6–31G*, respectively. Single‐point energies of all optimized molecular geometries were calculated at B3LYP/6–311 + G(2d,p) level. Results show that the pyrolytic reactions were carried out through a unimolecular first‐order mechanism which were caused by the migration of atom H(17) via a six‐member ring transition state. The activation energies which were verified by vibrational analysis and correlated with zero‐point energies along the reaction channel at B3LYP/6–311 + G(2d,p) level were 252.02 kJ. mo−1 (N‐ethyl substituted), 235.92 kJ‐mol−1 (N‐t‐isopropyl substituted) and 234.27 kJ‐mol−1 (N‐t‐butyl substituted), respectively. The results were in good agreement with available experimental data.
Synthesis of Substituted Indenyl Lanthanide Chloride and Molecular Structure of [(C5H9C9H6) 2Yb (μ‐Cl) 2Li (Et2O)2]
Authors: Dong‐Mei Cui , Tao Tang , Jian‐Hua Cheng , Wen‐Qi Chen , Bao‐Tong Huang 
Published: September 2010

AbstractReaction of anhydrous ytterbium trichlorides with 2 equiv. of cyclopentylindenyl lithium in THF solution, followed by removal of the solvent and crystallization of the product from diethyl ether, affords a crystal complex of the composition (C5H9C9H6)2Yb (μ‐Cl)2Li(Et2O)2. Crystallographic analysis shows that the ytterbium coordinated by two cyclopentylindenyl rings and lithium surrounded by two ether molecules are bridged by the two chlorine atoms and Yb, Li and two chlorine atoms form a plane.
In Situ Monitoring of the Generation of Monodisperse Silica Particles during the Hydrolysis of Tetraethyl Orthosilicate with Piezoelectric Quartz Crystal Impedance Analyzer
Authors: You‐Yu Zhang , Qing‐Ji Xie , Shou‐Zhuo Yao 
Published: September 2010

AbstractThe piezoelectric quartz crystal (PQC) impedance analyzer was used to monitor in situ the generation of monodisperse silica particles during the hydrolysis of tetraethyl orthosilicate (TEOS) and their adsorption onto an Au electrode in alcohol solutions containing water (6–15 mol/L) and ammonia (0.2–2.0 mol/L). The equivalent circuit parameters, the resonance frequencies and the half‐peak width values of the conductance spectra of the PQC resonance were obtained. The resonant frequency decreased notably while the motional resistance changed very slightly (within 1 ω) during the hydrolysis reaction, suggesting that the mass effect dominated the adsorption of generated monodisperse silica particles on the gold electrode in this system. Changes in f0 indicated that the ammonia concentration affected the hydrolytic reaction obviously, and the influence of water concentration on the reaction was small while the water was significantly excessive. Kinetics of monodisperse silica particle adsorption occurring at the electrode solution interface was analyzed using a first‐order reaction scheme. In addition, the electrolyte‐induced precipitation of the monodisperse silica particles was monitored and discussed. The mean size, the number of adsorbed particles per area and the converge of monodisperse silica particles were obtained from scanning electron microscope (SEM) observations.
Langmuir Aggregation of Thionin in Nucleic Acids and Its Application
Authors: Hong‐Wen Gao 
Published: September 2010

AbstractThe microsurface adsorption‐spectral correction (MSASC) technique has been described. The formation of the double electrostatic films in nucleic acids causes the monolayer aggregation of stain molecules. The interaction of thionin (TN) with nucleic acids, ctD‐NA, sDNA and yRNA, has been investigated at pH 7.8. Results show that the binding ratios of TN to ctDNA‐P, sDNA‐P and yR‐NA‐P are 1.27, 1.30 and 1.40, respectively, the binding constants of the aggregates are 2.8 · 104, 9.10 · 104 and 6.49 · 103 and their molar absorptivities are 1.04 · 104, 1.25 · 104 and · 104 L· mol−1, cm−1 at 630 nm. The aggregation may be applied to the spectrophotometric detection of nucleic acids samples.
Synthesis of Ultra‐high Molecular Weight Polystyrene with a Catalyst System Based on Calixarene‐yttrium Complex
Authors: Yao‐Feng Chen , Yi‐Feng Zhang , Zhi‐Quan Shen 
Published: September 2010

AbstractPolymerization of styrene (St) with a new catalyst system composed of calixarene‐yttrium complex, magnesium‐aluminium alkyls and hexamethyl phosphoramide was studied. Hie catalyst system shows extremely high activity (> 7 × 106 g PSt/mol Y × h) and gives polystyrene with very high viscosity‐average molecular weight (>5 × 105).