bluuebunny/crossref_metadata_2025_split huggingface dataset:
Total Synthesis of (−)‐Balanol, All Stereoisomers, Their N‐Tosyl Analogues, and Fully Protected Ophiocordin: An Easy Route to Hexahydroazepine Cores from Garner Aldehydes
Authors: Srivastava Ajay Kumar , Panda Gautam 
Published: April 2008

AbstractTotal syntheses of (−)‐balanol and all of its stereoisomers starting from easily available Garner aldehydes are described. Diastereoselective Grignard reactions on Garner aldehydes and ring‐closing metatheses are the key steps for the construction of hexahydroazepine subunits. The benzophenone subunits were constructed through coupling of suitably functionalized aromatic aldehyde and bromo components. The synthetic route constitutes a convenient and scalable reaction sequence to generate all of the stereoisomers of balanol. The methodology is explored further for the synthesis of N‐tosyl analogues of balanol and of fully protected ophiocordin.
Reactivity of Silole within a Core‐Modified Porphyrin Environment: Synthesis of 21‐Silaphlorin and its Conversion to Carbacorrole
Authors: Skonieczny Janusz , Latos‐Grażyński Lechosław , Szterenberg Ludmiła 
Published: April 2008

AbstractCondensation of 1,1‐dimethyl‐3,4‐diphenyl‐2,5‐bis(p‐tolylhydroxymethyl)silole with pyrrole and p‐tolylaldehyde did not form the expected 21,21‐dimethyl‐2,3‐diphenyl‐5,10,15,20‐tetra(p‐tolyl)‐21‐silaporphyrin, but rather its reduced derivative, 21‐silaphlorin, which contains a tetrahedrally hybridised C5 carbon atom. Attempts to trap 21‐silaporphyrin resulted in the serendipitous discovery of a unique transformation of 21‐silaphlorin into a non‐aromatic isomer of 2,3‐diphenyl‐5,10,15,21‐tetra(p‐tolyl)‐carbacorrole (iso‐carbacorrole). This novel carbaporphyrinoid contains a cyclopentadiene ring embedded in a tripyrrolic framework. This transformation of 21‐silaphlorin to iso‐carbacorrole, carried out under oxidative conditions, involves extrusion of dimethylsilylene accompanied by migration of the Cmeso‐(p‐tolyl) unit to create a cyclopentadiene ring directly linked to the adjacent pyrrole through a tetrahedral carbon atom. Insertion of silver or copper ions into iso‐carbacorrole gave two structurally related organometallic complexes of “true” carbacorrole in which the metal(III) ions are bound by three pyrrolic nitrogen atoms and a tetrahedrally hybridised C21 atom of the cyclopentadiene moiety. In the presence of oxygen, the silver(III) carbacorrole undergoes internal oxidation to 21‐oxacorrole. The structure of silver(III) carbacorrole was determined by X‐ray crystallography. The C21 atom was found to have a tetrahedral geometry. The AgC(sp3) (2.046(5) Å) bond length is similar to that in silver(III) carbaporphyrinoids in which a trigonal carbon atom coordinates to the metal ion. Density functional theory was applied to model the molecular and electronic structure of 21‐silaphlorin and feasible isomers of carbacorrole. The total energies (kcal mol−1 vs. iso‐carbacorrole), calculated at the B3LYP/6‐31G**//B3LYP/6‐31G* level for carbacorrole, iso‐carbacorrole, vacataporphyrin and cyclobutadienephlorin, demonstrate the energetic preference for iso‐carbacorrole.
High Catalytic Activities of Artificial Peroxidases Based on Supramolecular Hydrogels That Contain Heme Models
Authors: Wang Qigang , Yang Zhimou , Ma Manlung , Chang Chi K. , Xu Bing 
Published: April 2008

AbstractComposed of a supramolecular hydrogel and a heme model compound, a new type of artificial peroxidase shows high catalytic activity in organic media. The activity of this new type of artificial enzyme is significantly higher than that of the heme model compounds alone. Changes in the distal substituents above the coordinated‐metal centers of the model compounds directly modulate catalytic activity. This supramolecular‐hydrogel‐based artificial enzyme is most active in toluene, reaching about 90 % of the nascent activity of horseradish peroxidase. Moreover, this study confirms that the incorporation of the heme models into the nanofibers of gelators accounts for most of the enhancement of catalytic activity.
Controlled Direct Synthesis of C‐Mono‐ and C‐Disubstituted Derivatives of [3,3′‐Co(1,2‐C2B9H11)2]− with Organosilane Groups: Theoretical Calculations Compared with Experimental Results
Authors: Juárez‐Pérez Emilio José , Viñas Clara , González‐Campo Arántzazu , Teixidor Francesc , Sillanpää Reijo , Kivekäs Raikko , Núñez Rosario 
Published: April 2008

AbstractMono‐ and dilithium salts of [3,3′‐Co(1,2‐C2B9H11)2]−, (1−), react with different chlorosilanes (Me2SiHCl, Me2SiCl2, Me3SiCl and MeSiHCl2) with an accurate control of the temperature to give a set of novel Cc‐mono‐ (Cc=Ccluster) and Cc‐disubstituted cobaltabis(dicarbollide) derivatives with silyl functions: [1‐SiMe2H‐3,3′‐Co(1,2‐C2B9H10)(1′,2′‐C2B9H11)]− (3−); [1,1′‐μ‐SiMe2‐3,3′‐Co(1,2‐C2B9H10)2]− (4−); [1,1′‐μ‐SiMeH‐3,3′‐Co(1,2‐C2B9H10)2]− (5−); [1‐SiMe3‐3,3′‐Co(1,2‐C2B9H10)(1′,2′‐C2B9H11)]− (6−) and [1,1′‐(SiMe3)2‐3,3′‐Co(1,2‐C2B9H10)2]− (7−). In a similar way, the [8,8′‐μ‐(1′′,2′′‐C6H4)‐1,1′‐μ‐SiMe2‐3,3′‐Co(1,2‐C2B9H9)2]− (8−); [8,8′‐μ‐(1′′,2′′‐C6H4)‐1,1′‐μ‐SiMeH‐3,3′‐Co(1,2‐C2B9H9)2]− (9−) and [8,8′‐μ‐(1′′,2′′‐C6H4)‐1‐SiMe3‐3,3′‐Co(1,2‐C2B9H9)(1′,2′‐C2B9H10)]− (10−) ions have been prepared from [8,8′‐μ‐(1′′,2′′‐C6H4)‐3,3′‐Co(1,2‐C2B9H10)2]− (2−). Thus, depending on the chlorosilane, the temperature and the stoichiometry of nBuLi used, it has been possible to control the number of substituents on the Cc atoms and the nature of the attached silyl function. All compounds were characterised by NMR and UV/Vis spectroscopy and MALDI‐TOF mass spectrometry; [NMe4]‐3, [NMe4]‐4 and [NMe4]‐7 were successfully isolated in crystalline forms suitable for X‐ray diffraction analyses. The 4− and 8− ions, which contain one bridging ‐μ‐SiMe2 group between each of the dicarbollide clusters, were unexpectedly obtained from the reaction of the monolithium salts of 1− and 2−, respectively, with Me2SiHCl at −78 °C in 1,2‐dimethoxyethane. This suggests that an intramolecular reaction has taken place, in which the acidic CcH proton reacts with the hydridic SiH, with subsequent loss of H2. Some aspects of this reaction have been studied by using DFT calculations and have been compared with experimental results. In addition, DFT theoretical studies at the B3 LYP/6‐311G(d,p) level of theory were applied to optimise the geometries of ions 1−–10− and calculate their relative energies. Results indicate that the racemic mixtures, rac form, are more stable than the meso isomers. A good concordance between theoretical studies and experimental results has been achieved.
New M3N@C2n Endohedral Metallofullerene Families (M=Nd, Pr, Ce; n=40–53): Expanding the Preferential Templating of the C88 Cage and Approaching the C96 Cage
Authors: Chaur Manuel N. , Melin Frederic , Elliott Bevan , Kumbhar Amar , Athans Andreas J. , Echegoyen Luis 
Published: April 2008

AbstractThree new families of trimetallic nitride template endohedral metallofullerenes (TNT EMFs), based on cerium, praseodymium, and neodymium clusters, were synthesized by vaporizing packed graphite rods in a conventional Krätschmer–Huffman arc reactor. Each of these families of metallofullerenes was identified and characterized by mass spectroscopy, HPLC, UV/Vis‐NIR spectroscopy, and cyclic voltammetry. The mass spectra and HPLC chromatograms show that these larger metallic clusters are preferentially encapsulated by a C88 cage. When the size of the cluster is increased, the C96 cage is progressively favored over the predominant C88 cage. It is also observed that the smaller cages (C80–C86) almost disappear on going from neodymium to cerium endohedral metallofullerenes. The UV/Vis‐NIR spectra and cyclic voltammograms confirm the low HOMO–LUMO gap and reversible electrochemistry of these M3N@C88 metallofullerenes.
Organic–Inorganic Nanohybrids through the Direct Tailoring of Semiconductor Nanocrystals with Conjugated Polymers
Authors: Lin Zhiqun 
Published: April 2008

AbstractTwo main synthetic strategies are used to prepare conjugated oligomer‐ or polymer‐nanocrystal nanohybrids. In the first strategy ligand exchange is invoked to either replace with a bifunctional ligand, which contains a second functional group for coupling with conjugated oligomers or polymers (COs or CPs), or exchange for the functionalized COs or CPs in a “grafting‐onto” process. Alternatively, in the second strategy the nanocrystal (NC) is passivated with functional ligands from which COs or CPs are directly grown in the absence of ligand exchange. The well‐defined interface between the COs or CPs and NCs facilitates an efficient charge‐transfer between them.
Efficient Synthesis of Methylenetetrahydrofurans and Methylenepyrrolidines by Formal [3+2] Cycloadditions of Propargyl Substrates
Authors: Yamazaki Shoko 
Published: April 2008

AbstractRecent developments concerning the synthesis of methylenetetrahydrofurans and methylenepyrrolidines by one‐pot formal [3+2] cycloadditions involving propargylic (and allylic) alcohols and amines with electrophilic alkenes are described. The synthetic methods provide powerful tools to prepare highly functionalized oxygen‐ and nitrogen‐containing five‐membered ring systems. The reactions can be effectively promoted by base, base/transition metals, and Lewis acids, depending on the substrates.
ChemInform Abstract: Theoretical Study of Binding Interactions and Vibrational Raman Spectra of Water in Hydrogen‐Bonded Anionic Complexes: (H2O)n‐ (n = 2 and 3), H2O×××X‐ (X: F, Cl, Br, and I), and H2O×××M‐ (M: Cu, Ag, and Au).
Authors: Wu De‐Yin , Duan Sai , Liu Xiu‐Min , Xu Yong‐Chun , Jiang Yu‐Xiong , Ren Bin , Xu Xin , Lin S. H. , Tian Zhong‐Qun 
Published: April 2008

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: Phase Stabilities of Monoclinic Oxoborates LaB3O6 and GdB3O6 in C121 and I12/a1 Phase—Energetics and Chemical Bonds Derived from First‐Principles Calculations.
Authors: Yang Jun , Dolg Michael 
Published: April 2008

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 Crystal Structure of Thorium Bis(hydrogenphosphate) Monohydrate.
Authors: Salvado Miguel A. , Pertierra Pilar , Castro German R. , Trobajo Camino , Garcia Jose R. 
Published: April 2008

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: Multicolor Tuning of (Ln, P)‐Doped YVO4 Nanoparticles by Single‐Wavelength Excitation.
Authors: Wang Feng , Xue Xuejia , Liu Xiaogang 
Published: April 2008

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: Time‐Resolved Laser‐Induced Luminescence of UV—Vis Emission of Nd3+ in Fluorite, Scheelite and Barite.
Authors: Gaft M. , Reisfeld R. , Panczer G. , Dimova M. 
Published: April 2008

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: 151Eu and 121Sb Moessbauer Spectroscopy of EuSbSe3 and EuBiSe3.
Authors: Schappacher Falko M. , Poettgen Rainer , Jin Geng Bang , Albrecht‐Schmitt Thomas E. 
Published: April 2008

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: Direct Decomposition of Nitric Oxide into Nitrogen and Oxygen over C‐Type Cubic Y2O3—ZrO2 Solid Solutions.
Authors: Masaki Hiroyuki , Masui Toshiyuki , Imanaka Nobuhito 
Published: April 2008

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 QD‐3: The First Organically Templated Aluminoborate with 11‐, 12‐, and 14‐Ring Intersecting Channels.
Authors: Wang Guo‐Ming , Li Jin‐Hua , Li Zeng‐Xin , Huang Hai‐Lan , Xue Shu‐Yun , Liu Hui‐Luan 
Published: April 2008

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: Potassium Rich Rare Earth (RE) Borates K3RE(BO3)2.
Authors: Gao J. H. , Li R. K. 
Published: April 2008

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: Octahedral Coordination Compounds of the Ni, Pd, Pt Triad
Authors: Kirchmann Marius , Eichele Klaus , Schappacher Falko M. , Poettgen Rainer , Wesemann Lars 
Published: April 2008

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: Facile Incorporation of Platinum(IV) into Polyoxometalate Frameworks: Preparation of [H2Pt(IV)V9O28]5‐ and Chararacterization by 195Pt NMR Spectroscopy.
Authors: Lee Uk , Joo Hea‐Chung , Park Ki‐Min , Mal Sib Sankar , Kortz Ulrich , Keita Bineta , Nadjo Louis 
Published: April 2008

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 Chiral Benzimidazole‐Pyrrolidine Derivatives and Their Application in Organocatalytic Aldol and Michael Addition Reactions.
Authors: Reddy K. Rajender , Krishna G. Gopi , Rajasekhar C. V. 
Published: April 2008

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 Isochroman and Tetrahydroisoquinoline Derivatives from Baylis—Hillman Adducts by Radical Cyclization.
Authors: Gowrisankar Saravanan , Lee Hyun Seung , Kim Jae Nyoung 
Published: April 2008

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: Oxidation of Secondary Benzylic Alcohols to Ketones by Activated Carbon—Molecular Oxygen System.
Authors: Sano Yuki , Tanaka Takanori , Hayashi Masahiko 
Published: April 2008

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: Unexpected Tosyl Deprotection During Osmium Catalyzed Dihydroxylation.
Authors: Batt Frederic , Piva Olivier , Fache Fabienne 
Published: April 2008

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: Sm/HOAc/EtOH System Mediated Reduction of Baylis—Hillman Acetates.
Authors: Liu Yunkui , Mao Dajie , Xu Danqian , Xu Zhenyuan , Zhang Yongmin 
Published: April 2008

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: Radical Reactions in Aqueous Medium Using (Me3Si)3SiH.
Authors: Postigo Al , Kopsov Sergey , Ferreri Carla , Chatgillialoglu Chryssostomos 
Published: April 2008

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: Copper Methanesulfonate—Acetic Acid as a Novel Catalytic System for Tetrahydropyranylation of Alcohols and Phenols.
Authors: Wang Min , Song Zhi Guo , Gong Hong , Jiang Heng 
Published: April 2008

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: Cyclic Thioanhydrides: Linchpins for Multicomponent Coupling Reactions Based on the Reaction of Thioacids with Electron‐Deficient Sulfonamides and Azides.
Authors: Crich David , Bowers Albert A. 
Published: April 2008

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: Introducing Negative Charges into Bis‐p‐phenylene Crown Ethers: A Study of Bipyridinium‐Based [2]Pseudorotaxanes and [2]Rotaxanes.
Authors: Lestini Elena , Nikitin Kirill , Mueller‐Bunz Helge , Fitzmaurice Donald 
Published: April 2008

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: A Versatile Synthesis of α‐Amino Acid Derivatives via the Ugi Four‐Component Condensation with a Novel Convertible Isonitrile.
Authors: Rikimaru Kentaro , Yanagisawa Arata , Kan Toshiyuki , Fukuyama Tohru 
Published: April 2008

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: 1‐(Arylsulfonyl)cyclopropanol, a New Cyclopropanone Equivalent and Its Application to Prepare 1‐Alkynyl Cyclopropylamine.
Authors: Liu Jie , An Yan , Jiang Hai‐Ying , Chen Zili 
Published: April 2008

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: Lewis Acid Catalyzed Cascade Reactions of Arylmethylenecyclopropanes with 1,1,3‐Triarylprop‐2‐yn‐1‐ols or Their Methyl Ethers.
Authors: Yao Liang‐Feng , Shi Min 
Published: April 2008

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: A Facile Stereospecific Synthesis of (Z)‐2‐Sulfonyl‐substituted 1,3‐Enynes via Sonogashira Coupling of (E)‐α‐Iodovinyl Sulfones with 1‐Alkynes.
Authors: Hao Wen Yan , Jiang Jian Wen , Cai Ming Zhong 
Published: April 2008

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: Enantioselective Addition of Dialkylzinc Reagents to N‐(Diphenylphosphinoyl)imines Catalyzed by β‐Amino Alcohols with the Prolinol Skeleton.
Authors: Almansa Raquel , Guijarro David , Yus Miguel 
Published: April 2008

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: Enantioselective Construction of Quaternary Stereogenic Carbons by the Lewis Base Catalyzed Additions of Silyl Ketene Imines to Aldehydes.
Authors: Denmark Scott E. , Wilson Tyler W. , Burk Matthew T. , Heemstra John R. Jr. 
Published: April 2008

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: Catalytic, PMe3‐Mediated Conversion of Secondary Nitroalkanes to Ketones: A Very Mild Nef‐Type Process.
Authors: Bures Jordi , Vilarrasa Jaume 
Published: April 2008

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.