bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zr–Zeolite Beta: A New Heterogeneous Catalyst System for the Highly Selective Cascade Transformation of Citral to (±)‐Menthol
Authors: Nie Yuntong , Jaenicke Stephan , Chuah Gaik‐Khuan 
Published: January 2009

AbstractMinty green: Zr–zeolite beta (Zr‐beta) directs the one‐pot catalytic cascade transformation of citral to menthols with high diastereoselectivity. The solid catalyst, a bifunctional Ni/Zr‐beta or a composite Zr‐beta–Ni/MCM‐41 system, is easily recovered and reused in this green synthetic method (see figure).magnified imageThe transformation of citral to menthols involves hydrogenation steps as well as cyclisation of the intermediate, citronellal. The ability of Zr–zeolite beta to catalyse the cyclisation with high diastereoselectivity to (±)‐isopulegol is the critical step in this cascade transformation. Bifunctional catalysts containing nickel or rhodium supported on Zr–zeolite beta gave menthols in yields of 87–89 % and an excellent diastereoselectivity of 94 % for the desired (±)‐menthol. Dual catalyst systems of Zr–zeolite beta and nano‐dispersed Ni on an MCM‐41 support were equally effective and have the added advantage that the rates of the acid‐ and hydrogenation‐catalysed steps can be independently varied. By applying a pressure ramp of 0.2–2 MPa, the yield of menthols could be increased to 95 %, with 94 % diastereoselectivity for (±)‐menthol. The low initial pressure minimises the rates of competing hydrogenation reactions to byproducts such as citronellol and 3,7‐dimethyloctanol.
Regioselectivity Control in the Metal‐Catalyzed OC Functionalization of γ‐Allenols, Part 1: Experimental Study
Authors: Alcaide Benito , Almendros Pedro , Martínez del Campo Teresa , Soriano Elena , Marco‐Contelles José L. 
Published: January 2009

AbstractGuiding cyclization: The 5‐exo‐trig cyclization pathway of γ‐allenols can be completely reversed either by changing the metal (Pd instead of Au) or by using a methoxymethyl protecting group, with 7‐endo‐trig alkoxycyclization then dominating instead (see scheme). In addition, the regioselectivity of the La‐catalyzed cycloetherification can be modulated (5‐exo versus 6‐endo versus 7‐endo) simply through subtle variation in the functionalization of the allene component.magnified imageWe describe versatile regiocontrolled metal‐catalyzed heterocyclization reactions of γ‐allenol derivatives leading to a variety of fused enantiopure tetrahydrofurans, dihydropyrans, and tetrahydrooxepines. Regioselectivity control in the OC functionalization of γ‐allenols can be achieved through the choice of catalyst: use of AuCl3 exclusively affords tetrahydrofurans, use of La[N(SiMe3)2]3 usually favors the formation of dihydropyrans, whereas use of PdCl2 solely gives tetrahydrooxepines. In addition, it has been observed that for the Au‐catalyzed cycloisomerization, the presence of a methoxymethyl protecting group not only masks a hydroxy functionality, but also exerts directing effects as a controlling unit in a regioselectivity reversal (7‐endo versus 5‐exo cyclization). In addition, the regioselectivity of the La‐catalyzed cycloetherification can be tuned (5‐exo versus 7‐endo) simply through a subtle variation in the substitution pattern of the allene component (Ph versus Me). Thus, for the first time the regiocontrolled heterocyclization of γ‐allenol derivatives is both catalyst‐ and substrate‐directable. These metal‐catalyzed heterocyclization reactions have been developed experimentally (Part 1, this paper), and their mechanisms have additionally been investigated by a theoretical study (Part 2, accompanying paper).
Regioselectivity Control in the Metal‐Catalyzed Functionalization of γ‐Allenols, Part 2: Theoretical Study
Authors: Alcaide Benito , Almendros Pedro , Martínez del Campo Teresa , Soriano Elena , Marco‐Contelles José L. 
Published: January 2009

AbstractCalculating cyclization: Theoretical work directed towards the elucidation of the mechanisms of the gold‐, palladium‐, and lanthanum‐catalyzed oxycyclizations (5‐exo versus 6‐endo versus 7‐endo) of γ‐allenols has been pursued in close relationship with the experimental study (Part 1, accompanying paper) and has corroborated the bench results to provide a complete study of the reactivity of γ‐allenols under different metal‐catalyzed conditions.magnified imageThe gold‐, palladium‐ and lanthanum‐catalyzed oxycyclization reactions of azetidin‐2‐one‐tethered γ‐allenol derivatives to a variety of fused enantiopure tetrahydrofurans, dihydropyrans, and tetrahydrooxepines have been developed experimentally (Part 1, accompanying paper). The mechanisms of these regiocontrolled metal‐catalyzed heterocyclization reactions have now been computationally explored at the DFT level (Part 2). The energies of the reaction intermediates and transition states for different possible pathways have been calculated in various model systems very close to the real system. Additionally, we selected the La[N(SiH3)2]3 complex to simulate the lanthanide amide precatalyst species. The agreement of theoretically predicted and experimentally observed selectivities is very good in all cases
Room Temperature Dynamic Polymers Based on Diels–Alder Chemistry
Authors: Reutenauer P. , Buhler E. , Boul P. J. , Candau S. J. , Lehn J.‐M. 
Published: January 2009

AbstractPolymer, heal thyself! Dynamic polymers formed by a reversible Diels–Alder reaction were formed and studied by using neutron scattering at room temperature. They were used to obtain thin films that displayed self‐healing at room temperature (see figure).magnified imageDynamers based on reversible Diels–Alder chemistry have been obtained and shown to undergo dynamic exchange at room temperature. Their study in solution by small‐angle neutron scattering indicated the formation of long and highly flexible chains. Polydispersed molecules gave Tg values below room temperature, permitting the generation of a dynamic elastomer upon introduction of a dynamic cross‐linking agent. The use of a system with a low equilibrium constant gives access to materials with interesting self‐healing properties.
Copper‐Catalyzed Enantioselective β‐Boration of Acyclic Enones
Authors: Sim Hak‐Suk , Feng Xinhui , Yun Jaesook 
Published: January 2009

AbstractJosi or Mandy? Asymmetric conjugate addition of diboron to acyclic enones catalyzed by copper affords chiral organoboronates that possess a boronate group at the β stereocenter with excellent chemical yields and enantioselectivities (see scheme). This method accommodates the structural variation of acyclic enones and provides access to highly functionalized chiral organoboronates in one step.magnified imageThe enantioselective β‐boration of various acyclic enones has been studied by using chiral diphosphine–copper complexes. Good to excellent yields and enantioselectivities (up to 97 % ee (enantiomeric excess)) were observed for a range of substrates under optimized conditions. In this transformation, the addition of a controlled amount of alcohol, especially methyl alcohol, is critical to obtain products in high ee and yield. This methodology accommodates structural variation of acyclic enones and provides access to a range of functionalized chiral organoboronates in high enantiomeric purity.
Highly Efficient Access to Bi‐ and Tricyclic Ketals through Gold‐Catalyzed Tandem Reactions of 4‐Acyl‐1,6‐diynes
Authors: Meng Jia , Zhao Yu‐Long , Ren Chuan‐Qing , Li You , Li Zhu , Liu Qun 
Published: January 2009

AbstractSingle step: Fused bicyclic and bridged tricyclic ketals were synthesized in a single step from the reactions of easily available 4‐acyl‐1,6‐diynes with H2O and alkanols (see scheme). The highly efficient AuCl3‐catalyzed multicomponent domino reactions, involving five CO bond formations, can proceed in a highly regio‐ and diastereoselective manner at room temperature under air and lead to structures of high molecular complexity from simple starting materials in an atom economic way.magnified image
ChemInform Abstract: High‐Resolution Infrared Spectroscopy of trans‐ and cis‐H18ON18O: Equilibrium Structures of the Nitrous Acid Isomers.
Authors: Orphal V. Sironneau J. , Demaison J. , Chelin P. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Structural Disorder, Octahedral Coordination and Two‐Dimensional Ferromagnetism in Anhydrous Alums.
Authors: West D. V. , Huang Q. , Zandbergen H. W. , McQueen T. M. , Cava R. J. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Order—Disorder in In3+ Perovskites: The Example of A(In2/3B′′1/3)O3 (A: Ba, Sr; B′′: W, U).
Authors: Larregola S. A. , Alonso J. A. , Pinacca R. M. , Viola M. C. , Pedregosa J. C. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: The Layered Metal Ti2PTe2.
Authors: Philipp Frauke , Schmidt Peer , Ruck Michael , Schnelle Walter , Isaeva Anna 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Novel Rare Earth Ions‐Doped Oxyfluoride Nanocomposite with Efficient Upconversion White‐Light Emission.
Authors: Chen Daqin , Wang Yuansheng , Yu Yunlong , Huang Ping , Weng Fangyi 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of the Novel Perovskite‐Type Oxyfluoride PbScO2F under High Pressure and High Temperature.
Authors: Katsumata Tetsuhiro , Nakashima Mamoru , Umemoto Hiroshi , Inaguma Yoshiyuki 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Magnetocaloric Effect in CeCo4B Compound.
Authors: Gencer H. , Kervan N. , Gencer A. , Gunes M. , Atalay S. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Ternary Nitrides for Hydrogen Storage: Li—B—N, Li—Al—N and Li—Ga—N Systems.
Authors: Langmi Henrietta W. , McGrady G. Sean 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Electronic Structure and Photocatalytic Properties of ABi2Ta2O9 (A: Ca, Sr, Ba).
Authors: Li Yingxuan , Chen Gang , Zhang Hongjie , Li Zhonghua , Sun Jingxue 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Ternary Compound B4CN4 Prepared by Direct Nitridation of B4C.
Authors: Zhuge Fei , Yamanaka Shoji 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Spontaneous Resolution of Chiral Polyoxometalate‐Based Compounds Consisting of 3D Chiral Inorganic Skeletons Assembled from Different Helical Units.
Authors: Lan Ya‐Qian , Li Shun‐Li , Wang Xin‐Long , Shao Kui‐Zhan , Du Dong‐Ying , Su Zhong‐Min , Wang En‐Bo 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis and Structures of New Niobium Cluster Compounds with Pyridinium Cations: (PyrH)2[Nb6Cl18]×EtOH (Pyr: Pyridine, Et: Ethyl) and the Cubic Modification of (PyrH)2[Nb6Cl18].
Authors: Flemming Anke , Hoppe Alessandra , Koeckerling Martin 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Crystal Structure, Spectroscopic Properties, and Magnetic Behavior of the Fluoride‐Derivatized Lanthanoid(III) ortho‐Oxomolybdates(VI) LnF[MoO4] (Ln: Sm—Tm).
Authors: Hartenbach Ingo , Strobel Sabine , Dorhout Peter K. , Schleid Thomas 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Crystal Structure and High‐Pressure Studies of WAl2, an Aluminide Crystallizing with the CrSi2 Structure Type.
Authors: Gu Q. F. , Jung D. Y. , Krauss G. , Steurer W. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis and Characterization of the K2NiF4 Phases La1+xSr1‐xCo0.5Fe0.5 O4‐δ (x = 0, 0.2).
Authors: El Shinawi H. , Greaves C. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Highly Enantioselective Aza Morita—Baylis—Hillman Reaction Catalyzed by Bifunctional β‐Isocupreidine Derivatives.
Authors: Abermil Nacim , Masson Geraldine , Zhu Jieping 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Uses of Piperonal in the Synthesis of Novel Prop‐2‐enoyl Amides, Esters, Heterocyclic Systems and Study of Their Antibacterial Activities.
Authors: Shiba Sayed A. , El‐Ziaty Ahmed K. , El‐Aasar Nadia K. , Al‐Saman Hana'a A. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: One‐Pot Synthesis of 6‐(Thien‐2‐yl)‐ and 6‐(Fur‐2‐yl)salicylates Based on Regioselective [3 + 3] Cyclocondensations of 1,3‐Bis(trimethylsilyloxy)‐1,3‐butadienes.
Authors: Hussain Ibrar , Riahi Abdolmajid , Yawer Mirza Arfan , Villinger Alexander , Fischer Christine , Goerls Helmar , Langer Peter 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Arylthiols as Highly Chemoselective and Environmentally Benign Radical Reducing Agents.
Authors: Yamago Shigeru , Matsumoto Atsushi 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Regiospecific Chlorination of Xylenes Using K‐10 Montmorrillonite Clay.
Authors: Thirumamagal B. T. S. , Narayanasamy Sureshbabu , Venkatesan R. 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: N‐Alkylation of Imides Using Phase Transfer Catalysts under Solvent‐Free Conditions.
Authors: Jaskowska Jolanta , Kowalski Piotr 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Substituted Monohalobenzenes via ortho‐Selective Cross‐Coupling of Dihalobenzenes with Electron‐Donating ortho‐Directing Groups.
Authors: Ishikawa Shunpei , Manabe Kei 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Gallium Triiodide as a Highly Efficient and Mild Catalyst for the Diethyl Acetalization of Carbonyl Compounds.
Authors: Ding Jin‐Chang , Xu Rong , Liu Miao‐Chang , Chen Xi‐An , Wu Hua‐Yue 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Preparation of Aryl and Heteroaryl Indium(III) Reagents by the Direct Insertion of Indium in the Presence of LiCl.
Authors: Chen Yi‐Hung , Knochel Paul 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: One‐Pot Negishi Cross‐Coupling Reactions of in situ Generated Zinc Reagents with Aryl Chlorides, Bromides, and Triflates.
Authors: Sase Shohei , Jaric Milica , Metzger Albrecht , Malakhov Vladimir , Knochel Paul 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Aryllithium Compounds Bearing Alkoxycarbonyl Groups: Generation and Reactions Using a Microflow System.
Authors: Nagaki Aiichiro , Kim Heejin , Yoshida Jun‐ichi 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Novel Calix[4]arenocrowns via Ring‐Closing Metathesis.
Authors: Lu Lin‐Gang , Lue Hai‐Yan 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Asymmetric Aza‐Michael Reactions of α,β‐Unsaturated Ketones with Bifunctional Organic Catalysts.
Authors: Lu Xiaojie , Deng Li 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis and Reactivity of Novel α,α,β‐ and α,α,δ‐Trichlorinated Imines.
Authors: D'hooghe Mathias , De Meulenaer Bruno , De Kimpe Norbert 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Highly Enantioselective Sequential Hydrogenation of Ethyl 2‐Oxo‐4‐arylbut‐3‐enoate to Ethyl 2‐Hydroxy‐4‐arylbutyrate.
Authors: Meng Qinghua , Zhu Lufeng , Zhang Zhaoguo 
Published: January 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.