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Organocatalyzed α-Oxyamination of Aldehydes Using Anodic Oxidation
Bui, Nhat-Nguyen,Ho, Xuan-Huong,Mho, Sun-il,Jang, Hye-Young WILEY-VCH Verlag 2009 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2009 No.31
<P>Electrochemical oxidation was performed during the organocatalyzed α-oxyamination of aldehydes by using a one-compartment electrolytic cell under galvanostatic conditions. In the presence of substoichiometric amounts of sec-amines, the desired coupling products were formed in good yield. The asymmetric variant of the α-oxyamination of aldehydes was examined by using chiral sec-amines. Control experiments and cyclic voltammetry confirmed the key intermediate of this reaction to be the cationic radical of the enamine derived from the sec-amine catalysts and aldehydes. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)</P> <B>Graphic Abstract</B> <P>Anodic oxidation was used to promote the organocatalyzed α-oxyamination of aldehydes. Under galvanostatic conditions, cationic radical intermediates are formed as key intermediates. Cyclic voltammetry and control experiments were carried out to confirm the proposed intermediates and the mechanism of the reaction. <img src='wiley_img/1434193X-2009-2009-31-EJOC200900871-fig000.gif' alt='wiley_img/1434193X-2009-2009-31-EJOC200900871-fig000'> </P>
Chin, Chong Shik,Eum, Min-Sik,Kim, Song yi,Kim, Choongil,Kang, Sung Kwon WILEY-VCH Verlag 2006 European journal of inorganic chemistry Vol.2006 No.24
<P>A new type of iridium(III) complex [trans-Ir(ppy)<SUB>2</SUB>(PPh<SUB>3</SUB>)<SUB>2</SUB>]<SUP>+</SUP> (1) has been prepared by a novel synthetic method and its structural and photoluminescent characteristics have been compared with those of the cis analogue, [cis-Ir(ppy)<SUB>2</SUB>(PPh<SUB>3</SUB>)(P(OPh)<SUB>3</SUB>)]<SUP>+</SUP> (2) which has also been newly prepared in this study. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2006-2006-24-EJIC200600888-fig000.gif' alt='wiley_img/14341948-2006-2006-24-EJIC200600888-fig000'> </P>
Lee, So Young,Seo, Joobeom,Yoon, Il,Kim, Chung-Sik,Choi, Kyu Seong,Kim, Jae Sang,Lee, Shim Sung WILEY-VCH Verlag 2006 European journal of inorganic chemistry Vol.2006 No.17
<P>Two isomeric S<SUB>2</SUB>O<SUB>2</SUB> macrocycles (L<SUP>1</SUP> and L<SUP>2</SUP>) with a 14-membered cavity have been synthesised as a model system with different binding modes. Self-assembly reactions of L<SUP>1</SUP> and L<SUP>2</SUP> with silver perchlorate afford the respective ligand-directed cyclic oligomer complexes with different shapes: a poly(bicyclic dimer) (1) and a discrete cyclic tetramer (2). The formation of these supramolecular complexes is discussed in terms of conformational discrimination of two isomeric macrocycles due to ring rigidity and interdonor distances.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2006-2006-17-EJIC200600290-fig000.gif' alt='wiley_img/14341948-2006-2006-17-EJIC200600290-fig000'> </P>
Dinuclear Metallocenes with a Modulated Biphenylene Bridge for Olefin Polymerization
Kim, Seong Kyun,Kim, Hwa Kyu,Lee, Min Hyung,Yoon, Seung Woong,Han, Yonggyu,Park, Sungjin,Lee, Junseong,Do, Youngkyu WILEY-VCH Verlag 2007 European journal of inorganic chemistry Vol. No.
<P>Dinuclear group 4 metallocene catalysts linked by a biphenylene or 1,2-diphenylethylene bridge, namely [4,4′-(C<SUB>5</SUB>Me<SUB>4</SUB>)<SUB>2</SUB>(C<SUB>6</SUB>H<SUB>4</SUB>)<SUB>2</SUB>][CpZrCl<SUB>2</SUB>]<SUB>2</SUB> (2a), [p-(C<SUB>5</SUB>Me<SUB>4</SUB>)C<SUB>6</SUB>H<SUB>4</SUB>CH<SUB>2</SUB>]<SUB>2</SUB>[CpZrCl<SUB>2</SUB>]<SUB>2</SUB> (2b), [p-(3,4-Me<SUB>2</SUB>C<SUB>5</SUB>H<SUB>2</SUB>)C<SUB>6</SUB>H<SUB>4</SUB>CH<SUB>2</SUB>]<SUB>2</SUB>[CpZrCl<SUB>2</SUB>]<SUB>2</SUB> (2c), [(C<SUB>5</SUB>Me<SUB>4</SUB>)<SUB>2</SUB>(C<SUB>6</SUB>H<SUB>4</SUB>)<SUB>2</SUB>][TiCl<SUB>3</SUB>]<SUB>2</SUB> (3a), [p-(C<SUB>5</SUB>Me<SUB>4</SUB>)C<SUB>6</SUB>H<SUB>4</SUB>CH<SUB>2</SUB>]<SUB>2</SUB>[TiCl<SUB>3</SUB>]<SUB>2</SUB> (3b), and [p-(3,4-Me<SUB>2</SUB>C<SUB>5</SUB>H<SUB>2</SUB>)C<SUB>6</SUB>H<SUB>4</SUB>CH<SUB>2</SUB>]<SUB>2</SUB>[TiCl<SUB>3</SUB>]<SUB>2</SUB> (3c), have been prepared and the crystal structures of 2b and 3b determined by X-ray diffraction methods. The crystal structures reveal that these complexes consist of two equivalent metal units inverted with respect to the center of the bridge. All the complexes were tested for the polymerization of ethylene and styrene in the presence of methylaluminoxane (MAO), and direct comparisons of their catalytic properties with those of the corresponding mononuclear analogues [(PhC<SUB>5</SUB>Me<SUB>4</SUB>)CpZrCl<SUB>2</SUB>] (4a), [(p-TolC<SUB>5</SUB>Me<SUB>4</SUB>)CpZrCl<SUB>2</SUB>] (4b), [(1-p-Tol-3,4-Me<SUB>2</SUB>C<SUB>5</SUB>H<SUB>2</SUB>)CpZrCl<SUB>2</SUB>] (4c), [(PhC<SUB>5</SUB>Me<SUB>4</SUB>)TiCl<SUB>3</SUB>] (5a), [(p-TolC<SUB>5</SUB>Me<SUB>4</SUB>)TiCl<SUB>3</SUB>] (5b), and [(1-p-Tol-3,4-Me<SUB>2</SUB>C<SUB>5</SUB>H<SUB>2</SUB>)TiCl<SUB>3</SUB>] (5c) were performed. The dinuclear zirconocenes show a high activity in ethylene polymerization comparable with those of the corresponding mononuclear catalysts and give an increased molecular weight of polyethylene. The dinuclear half-sandwich titanocenes exhibit similar or slightly lower activity and molecular weight in styrene polymerization compared with their mononuclear analogues. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2007-2007-4-EJIC200600833-fig000.gif' alt='wiley_img/14341948-2007-2007-4-EJIC200600833-fig000'> </P>
Synthesis of the Tetraketide Lactones from the Pikromycin Biosynthetic Pathway
Oh, Hong-Se,Yun, Ji-Suk,Nah, Ki-Hyun,Kang, Han-Young,Sherman, David H. WILEY-VCH Verlag 2007 European journal of organic chemistry Vol.2007 No.20
<P>Synthesis of tetraketide lactones 2 and 3, which are likely to be produced by a model pikromycin polyketide synthase (PKS), has been investigated. The tetraketide lactones with six-membered rings, 2a and 2b, were synthesized successfully by the asymmetric aldol reaction, allylation, and the Reformatsky reaction. The attempted synthesis of tetraketide lactones with eight-membered rings, 3a and 3b, led to the formation of the compounds 2a and 2b. The synthesis of another tetraketide lactone compounds 35 was attempted with the hope that introducing an additional methyl group would lead to a change in thermodynamic stability. However, it produced the corresponding tetraketide lactone 34 with a six-membered ring. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/1434193X-2007-2007-20-EJOC200700254-fig000.gif' alt='wiley_img/1434193X-2007-2007-20-EJOC200700254-fig000'> </P>
Seop Hong, Chang,Hee Yoon, Jung,Hak Lim, Jeong,Hee Ko, Hyun WILEY-VCH Verlag 2005 European journal of inorganic chemistry Vol.2005 No.23
<P>A new tp-bridged complex [Ni(pyrazole)<SUB>4</SUB>(tp)]<SUB>n</SUB> (1; tp = terephthalate) coordinated with a nonchelating pyrazole ligand has been synthesized and characterized using X-ray structure determination and magnetic studies. The crystal structure reveals that the capping ligand functions as a source of hydrogen bonding and intermolecular contacts, such as π–π and CH–π interactions, that result in a three-dimensional supramolecular assembly. Weak antiferromagnetic couplings are transmitted between Ni<SUP>II</SUP> centers through the tp linkage. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2005-2005-23-EJIC200500526-fig000.gif' alt='wiley_img/14341948-2005-2005-23-EJIC200500526-fig000'> </P>
Yu, Taekyung,Park, Yong Il,Kang, Min-Cheol,Joo, Jin,Park, Jin Kyung,Won, Ho Youn,Kim, Jae Jeong,Hyeon, Taeghwan WILEY-VCH Verlag 2008 European journal of inorganic chemistry Vol.2008 No.6
<P>Ceria nanocrystals with a cube shape were synthesized from the hydrolytic sol–gel reaction of cerium salt in the presence of oleylamine. The overall synthetic process is very simple and readily applicable to the large-scale synthesis of tens of grams of product in a single reaction in air. These ceria nanocrystals are readily dispersible in aqueous media without the addition of any extra dispersing agent. The aqueous dispersion of the ceria nanocrystals was successfully used as a chemical mechanical polishing slurry, and it exhibited high removal selectivity between silicon oxide and silicon nitride at pH 7.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2008-2008-6-EJIC200700979-fig000.gif' alt='wiley_img/14341948-2008-2008-6-EJIC200700979-fig000'> </P>
Paital, Alok Ranjan,Hong, Chang Seop,Kim, Hyoung Chan,Ray, Debashis WILEY-VCH Verlag 2007 European journal of inorganic chemistry Vol.2007 No.12
<P>A new family of tetracopper clusters [Cu<SUB>4</SUB>(μ<SUB>4</SUB>-X)L<SUB>2</SUB>]ClO<SUB>4</SUB>·nH<SUB>2</SUB>O (1a–c) [X = Cl, Br, I; n = 12, 2, 2; H<SUB>3</SUB>L = 2-(2′-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine] have been synthesised and characterised. The X-ray crystal structure of 1a reveals that the template action of the spherical Cl<SUP>–</SUP> anion (μ<SUB>4</SUB>-Cl<SUP>–</SUP>), which features a unique rectangular planar bridging mode, is responsible for the self-assembly of two [Cu<SUB>2</SUB>L]<SUP>+</SUP> units in complex 1a. In this family of complexes the spherical halides serve as templates to assemble the dimeric unit into tetrameric complexes, which gives an insight into the role of the halide bridge in tetranuclear complex formation. The capacity of this bridge to mediate magnetic coupling has been examined by bulk magnetic measurements for complex 1a. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2007-2007-12-EJIC200600917-fig000.gif' alt='wiley_img/14341948-2007-2007-12-EJIC200600917-fig000'> </P>
Classification and geometric aspects of vector valued Fourier transforms
WILEY-VCH Verlag 2008 Mathematische Nachrichten Vol.281 No.4
<P>It is shown that for any locally compact abelian group 𝔾 and 1 ≤ p ≤ 2, the Fourier type p norm with respect to 𝔾 of a bounded linear operator T between Banach spaces, denoted by ‖T |ℱ𝒯<SUP>𝔾</SUP><SUB>p</SUB>‖, satisfies ‖T |ℱ𝒯<SUP>𝔾</SUP><SUB>p</SUB>‖ ≤ ‖T |ℱ𝒯<SUP>𝔸</SUP><SUB>p</SUB>‖, where 𝔸 is the direct product of ℤ<SUB>2</SUB>, ℤ<SUB>3</SUB>, ℤ<SUB>4</SUB>, … It is also shown that if 𝔾 is not of bounded order then C<SUP>n</SUP><SUB>p</SUB> ‖T |ℱ𝒯<SUP>𝕋</SUP><SUB>p</SUB>‖ ≤ ‖T |ℱ𝒯<SUP>𝔾</SUP><SUB>p</SUB>‖, where 𝕋 is the circle group, n is a onnegative integer and C<SUP>p</SUP> = <LATEX> <img src='wiley_img/0025584X-2008-281-4-MANA200310625-zmn1062501.gif' alt='wiley_img/0025584X-2008-281-4-MANA200310625-zmn1062501'> </LATEX>. From these inequalities, for any locally compact abelian group 𝔾 ‖T |ℱ𝒯<SUP>𝔾</SUP><SUB>2</SUB>‖ ≤ ‖T |ℱ𝒯<SUP>𝕋</SUP><SUB>2</SUB>‖, and moreover if 𝔾 is not of bounded order then ‖T |ℱ𝒯<SUP>𝔾</SUP><SUB>2</SUB>‖ = ‖T |ℱ𝒯<SUP>𝕋</SUP><SUB>2</SUB>‖. The Hilbertian property and B-convexity are discussed in the framework of Fourier type p norms. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Naumov, Nikolai G.,Tarasenko, Maria S.,Virovets, Alexander V.,Kim, Youngmee,Kim, Sung-Jin,Fedorov, Vladimir E. Wiley-VCH 2006 European journal of inorganic chemistry Vol. No.
<P>The interaction of aqueous solutions of octahedral cluster anions [Re<SUB>6</SUB>Q<SUB>8</SUB>(CN)<SUB>6</SUB>]<SUP>4–</SUP> with rare earth cations in the presence of glycerol resulted in the formation of a new family of compounds [Ln<SUB>2</SUB>(H<SUB>2</SUB>L)<SUB>2</SUB>(H<SUB>3</SUB>L)<SUB>4</SUB>][Re<SUB>6</SUB>Q<SUB>8</SUB>(CN)<SUB>6</SUB>] (where Ln = La, Nd, and Gd; Q = S, Se; H<SUB>3</SUB>L = glycerol; H<SUB>2</SUB>L<SUP>–</SUP> = glycerolate anion). All compounds are isostructural and crystallize in the P<TEX>$\bar {1}$</TEX> space group. Crystal structures are built from octahedral cluster anions [Re<SUB>6</SUB>Q<SUB>8</SUB>(CN)<SUB>6</SUB>]<SUP>4–</SUP> and centrosymmetrical dimers [Ln<SUB>2</SUB>(H<SUB>2</SUB>L)<SUB>2</SUB>(H<SUB>3</SUB>L)<SUB>4</SUB>]<SUP>4+</SUP> that have three different binding modes of glycerol. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2006-2006-2-EJIC200500542-fig000.gif' alt='wiley_img/14341948-2006-2006-2-EJIC200500542-fig000'> </P>