bluuebunny/crossref_metadata_2025 huggingface dataset:
Rhodium‐Catalyzed Dehydrocoupling of Fluorinated Phosphine–Borane Adducts: Synthesis, Characterization, and Properties of Cyclic and Polymeric Phosphinoboranes with Electron‐Withdrawing Substituents at Phosphorus
Authors: Clark Timothy J. , Rodezno José M. , Clendenning Scott B. , Aouba Stephane , Brodersen Peter M. , Lough Alan J. , Ruda Harry E. , Manners Ian
Published: May 2005

The dehydrocoupling of the fluorinated secondary phosphine–borane adduct R2PH⋅BH3 (R = p‐CF3C6H4) at 60 °C is catalyzed by the rhodium complex [{Rh(μ‐Cl)(1,5‐cod)}2] to give the four‐membered chain R2PH‐BH2‐R2P‐BH3. A mixture of the cyclic trimer [R2P‐BH2]3 and tetramer [R2P‐BH2]4 was obtained from the same reaction at a more elevated temperature of 100 °C. The analogous rhodium‐catalyzed dehydrocoupling of the primary phosphine–borane adduct RPH2⋅BH3 at 60 °C gave the high molecular weight polyphosphinoborane polymer [RPH‐BH2]n (Mw = 56 170, PDI = 1.67). The molecular weight was investigated by gel permeation chromatography and the compound characterized by multinuclear NMR spectroscopy. Interestingly, the electron‐withdrawing fluorinated aryl substituents have an important influence on the reactivity as the dehydrocoupling process occurred efficiently at the mildest temperatures observed for phosphine–borane adducts to date. Thin films of polymeric [RPH‐BH2]n (R = p‐CF3C6H4) have also been shown to function as effective negative‐tone resists towards electron beam (e‐beam) lithography (EBL). The resultant patterned bars were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) and time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS).
Structure and Stability of B20N20 Cluster
Authors: Cui Xiao‐Ying , Wu Hai‐Shun
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Theoretical Study on the (O2—HF)+ Complex
Authors: Tanaka Nobuaki , Sisk Wade N.
Published: May 2005

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First‐Principles Electronic Structure, Chemical Bonding, and High‐Pressure Phase Prediction of the Oxynitrides of Vanadium, Niobium, and Tantalum.
Authors: Lumey Marck‐Willem , Dronskowski Richard
Published: May 2005

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Cation Distribution and Phase Transformations in LiMn2‐yTiyO4 (0.2 ≤ y ≤ 1.5) Solid Solutions.
Authors: Petrov Kostadin , Rojas Rosa M. , Alonso Pablo J. , Amarilla Jose M. , Lazarraga Monica G. , Rojo Jose M.
Published: May 2005

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High Temperature Structural Studies of Ba2BiTaO6.
Authors: Zhou Qingdi , Kennedy Brendan J.
Published: May 2005

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Synthesis and Crystal Structure of BiCd2AsO6.
Authors: Evans Ivana Radosavljevic , Howard Judith A. K. , Sleight Arthur W.
Published: May 2005

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Polymorphism of Anhydrous Cadmium Iodate Structure of ε‐Cd(IO3)2.
Authors: Bentria Bachir , Benbertal Djamal , Hebboul Zoulikha , Bagieu‐Beucher Muriel , Mosset Alain
Published: May 2005

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Electrochemical Preparation of H2S and H2Se.
Authors: Bastide Stephane , Huegel Paul , Levy‐Clement Claude , Hodes Gary
Published: May 2005

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Solubility, Complex Formation, and Redox Reactions in the Tl2O3—HCN/CN‐—H2O System. Crystal Structures of the Cyano Compounds Tl(CN)3×H2O, Na[Tl(CN)4]×3H2O, K[Tl(CN)4], and TlI[TlIII(CN)4] and of TlI2C2O4.
Authors: Nagy Peter , Fischer Andreas , Glaser Julius , Ilyukhin Andrey , Maliarik Mikhail , Toth Imre
Published: May 2005

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Structure and Properties of the Thorium Vanadyl Tellurate, Th(VO2)2(TeO6)(H2O)2.
Authors: Sullens Tyler A. , Albrecht‐Schmitt Thomas E.
Published: May 2005

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Hydrothermal Syntheses and Crystal Structures of Two Novel, Hybrid Materials Based on Secondary Transition‐Metal‐Incorporated Polyoxovanadate Cluster Backbones: [Cd(dien)2]2 [(dien)CdAs8V13O41(H2O)] ×4H2O and [Cd(en)2]2 [(en)2Cd2As8V12O40].
Authors: Zheng Shou‐Tian , Zhang Jie , Yang Guo‐Yu
Published: May 2005

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Cyclic Polyvanadates Incorporating Template Transition Metal Cationic Species: Synthesis and Structures of Hexavanadate [PdV6O18]4‐, Octavanadate [Cu2V8O24]4‐, and Decavanadate [Ni4V10O30(OH)2 (H2O)6]4‐.
Authors: Kurata Taisei , Uehara Akira , Hayashi Yoshihito , Isobe Kiyoshi
Published: May 2005

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Control of Nanometer‐Scale Tunnel Sizes of Porous Manganese Oxide Octahedral Molecular Sieve Nanomaterials.
Authors: Shen Xiong‐Fei , Ding Yun‐Shuang , Liu Jia , Cai Jun , Laubernds Kate , Zerger Richard P. , Vasiliev Alexandre , Aindow Mark , Suib Steven L.
Published: May 2005

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Lewis Base‐Catalyzed anti‐Selective Mannich‐Type Reaction Between Trimethylsilyl Enolates and Aldimines.
Authors: Takahashi Eiki , Fujisawa Hidehiko , Mukaiyama Teruaki
Published: May 2005

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Vanadium‐Catalyzed Asymmetric Oxidation of α‐Hydroxy Esters Using Molecular Oxygen as Stoichiometric Oxidant.
Authors: Radosevich Alexander T. , Musich Christine , Toste F. Dean
Published: May 2005

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Copper(II) Triflate Immobilized in [bmin]BF4 Ionic Liquid: An Efficient Reaction Medium for Michael Addition of β‐Ketoesters to Acceptor‐Activated Alkenes.
Authors: Yadav J. S. , Reddy B. V. S. , Baishya Gakul , Narsaiah A. Venkat
Published: May 2005

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Mercuric Triflate Catalyzed Tandem Cyclization Leading to Polycarbocycles.
Authors: Imagawa Hiroshi , Iyenaga Tomoaki , Nishizawa Mugio
Published: May 2005

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Highly Enantioselective Epoxidation of 2,4‐Diarylenones by Using Dimeric Cinchona Phase‐Transfer Catalysts: Enhancement of Enantioselectivity by Surfactants.
Authors: Jew Sang‐sup , et al. et al.
Published: May 2005

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Microwave‐Assisted Direct ortho‐Acylation of Phenol and Naphthol Derivatives by BF3×(C2H5)2O.
Authors: Naeimi Hossein , Moradi Leila
Published: May 2005

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Highly Selective Deblocking of Propargyl Carbonates in the Presence of Propargyl Carbamates with Tetrathiomolybdate.
Authors: Ramesh R. , Bhat Ramakrishna G. , Chandrasekaran Srinivasan
Published: May 2005

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An Efficient Dealkylative Addition of Trialkylamines to Dialkyl Acetylenedicarboxylates in the Presence of a Metallic Chloride.
Authors: Cho Chan Sik
Published: May 2005

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Asymmetric [2,3]‐Rearrangement of Glycine‐Derived Allyl Ammonium Ylids.
Authors: Workman James A. , Garrido Neil P. , Sancon Julien , Roberts Edward , Wessel Hans Peter , Sweeney J. B.
Published: May 2005

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Dehydrohalogenation of Substituted Diethyl Halocyclopropane‐1,1‐dicarboxylates.
Authors: Boitsov V. M. , Kostikov R. R. , Molchanov A. P. , Stepakov A. V. , Baird M. S.
Published: May 2005

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Lewis Base‐Catalyzed Michael Reactions Between Trimethylsilyl Enolate and α,β‐Unsaturated Carbonyl Compounds.
Authors: Nakagawa Takashi , Fujisawa Hidehiko , Nagata Yuzo , Mukaiyama Teruaki
Published: May 2005

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Reagent‐Free Nazarov Cyclizations.
Authors: Douelle Frederic , Tal Lauren , Greaney Michael F.
Published: May 2005

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Metalated Nitriles: Electrophile‐Dependent Alkylations.
Authors: Fleming Fraser F. , Zhang Zhiyu , Wei Guoqing , Steward Omar W.
Published: May 2005

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Structure of the Reduction Products of N‐(m‐Tolyl)‐exo‐2,3‐epoxybicyclo [2.2.1]heptane‐endo‐5,endo‐6‐dicarboximide with Lithium Tetrahydridoaluminate.
Authors: Kas'yan L. I. , Krishchik O. V. , Kas'yan A. O. , Tarabara I. N.
Published: May 2005

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Reactions of N‐ and C‐Alkenylanilines. Part 6. Synthesis of 6‐Methyl‐2‐[(E or Z)‐1‐propenyl]anilines and the Corresponding Anilides and Their Reaction with Bromine.
Authors: Afon'kin I. S. , Sotnikov A. M. , Gataullin R. R. , Spirikhin L. V. , Abdrakhmanov I. B.
Published: May 2005

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A Novel Gallium/Samarium‐Mediated Coupling of Epoxides with Allyl Halides in Aqueous Media and Synthesis of Homoallylic Alcohols.
Authors: Gohain Mukut , Prajapati Dipak
Published: May 2005

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A New Route to β‐Trifluoromethylenaminones.
Authors: Zouaoui Emna , Rezgui Farhat , El Gaied Mohamed Moncef
Published: May 2005

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β‐Nitro Acrylic Esters as Precursors for the One‐Pot Synthesis of Polyfunctionalized α,β‐Unsaturated Esters.
Authors: Ballini Roberto , Fiorini Dennis , Palmieri Alessandro
Published: May 2005

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Reactions of Aniline with Alkali Metal Diphenylketyls and Dianions Derived from Benzophenone and Michler′s Ketone.
Authors: Turaeva D. A. , Kurbatov Yu. V.
Published: May 2005

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Oxabicyclo[3.2.1]octane Derivatives as Highly Reactive Dienophiles: Synthesis of Bicyclo[5.n.0] Systems.
Authors: Pelphrey Phillip , Jasinski Jerry , Butcher Ray J. , Wright Dennis L.
Published: May 2005

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Highly Efficient Light‐Harvesting Organofullerenes.
Authors: Gomez Rafael , Segura Jose L. , Martin Nazario
Published: May 2005

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Microwave‐Promoted One‐Pot Three‐Component Reaction to [60]Fulleropyrrolidine Derivatives.
Authors: Zhang Jianming , Yang Wen , Wang Sheng , He Ping , Zhu Shizheng
Published: May 2005

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Specific Character of the Pechmann Reaction of 4,8‐Di‐tert‐butyl‐5‐hydroxy‐2‐(4‐methoxyphenyl)‐2H‐naphtho[1,8‐bc]furan with Ethyl Acetoacetate.
Authors: Tyurin R. V. , Antonov A. N. , Minyaeva L. G. , Mezheritskii V. V.
Published: May 2005

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Asymmetric Synthesis of Heterocyclic β‐Aminosulfones via Nucleophilic 1,2‐Addition of 2‐Lithio‐benzo[b]thiophene to Aldehydes‐SAMP‐Hydrazones.
Authors: Enders Dieter , Del Signore Giuseppe
Published: May 2005

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Platinum‐Catalyzed Intramolecular Hydroamination of Unactivated Olefins with Secondary Alkylamines.
Authors: Bender Christopher F. , Widenhoefer Ross A.
Published: May 2005

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Palladium(0)‐Catalyzed Amino‐Heck Reaction of γ,δ‐Unsaturated Ketone N,N,N‐Trimethylhydrazonium Salts.
Authors: Kitamura Mitsuru , Yanagisawa Hideyuki , Yamane Motoki , Narasaka Koichi
Published: May 2005

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General and Efficient Indole Syntheses Based on Catalytic Amination Reactions.
Authors: Ackermann Lutz
Published: May 2005

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Effective scCO2‐Ionic Liquid Reaction System Based on Symmetric Aliphatic Ammonium Salts for the Rapid CO2 Fixation with Aziridine to 2‐Oxazolidinone.
Authors: Kawanami Hajime , Matsumoto Hajime , Ikushima Yutaka
Published: May 2005

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Novel Synthesis of Benzoxazoles from O‐Nitrophenols and Amines.
Authors: Nishioka Hiromi , Ohmori Yukiko , Iba Yumiko , Tsuda Eri , Harayama Takashi
Published: May 2005

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Synthesis of New Isoxazole Derivatives.
Authors: Ismailov V. M. , Kantaeva M. M. , Mamedov I. A. , Yusubov N. N.
Published: May 2005

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Phenylboronic Acid Mediated Triple Condensation Reactions of Phloroglucinol and Unsaturated Carbonyl Compounds.
Authors: Pettigrew Jeremy D. , Cadieux Jay A. , So Simon S. S. , Wilson Peter D.
Published: May 2005

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Microwave‐Enhanced Hydrogenations at Medium Pressure Using a Newly Constructed Reactor.
Authors: Heller Eberhard , Lautenschlaeger Werner , Holzgrabe Ulrike
Published: May 2005

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Partial Reduction of Pyridinium Salts as a Versatile Route to Dihydropyridones.
Authors: Donohoe Timothy J. , Johnson Dale J. , Mace Laura H. , Bamford Mark J. , Ichihara Osamu
Published: May 2005

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One‐Pot Synthesis of Substituted Quinolines by Iridium‐Catalyzed Three‐Component Coupling Reaction.
Authors: Igarashi Takeyuki , Inada Takashi , Sekioka Tadao , Nakajima Takayuki , Shimizu Isao
Published: May 2005

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A New [2 + 2] Photodimerization of 5‐Chloro‐ and 5‐Methyl‐2‐pyridone in Their Inclusion Complexes with 1,1′‐Biphenyl‐2,2′‐dicarboxylic Acid as a Model for DNA Damage by Photodimerization of Its Thymine Component.
Authors: Hirano Shinya , Toyota Shinji , Toda Fumio
Published: May 2005

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Efficient Synthesis of New Potentially Bioactive Tricyclic Pyridones.
Authors: Castera Caroline , Crozet Maxime D. , Crozet Michel P. , Vanelle Patrice
Published: May 2005

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Syntheses of Pyrrolo‐ and Furo‐1,4‐dihydropyridine Derivatives.
Authors: Matsuo Keizo , Adachi Masami , Takagi Tatsuko , Ueno Sachiko , Arase Takahiko , Kuroi Fumie
Published: May 2005

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Synthesis of Indole Derivatives of 2‐Thioxodihydro‐4,6(1H,5H)‐pyrimidinedione.
Authors: Semenov B. B. , Levina I. I. , Krasnov K. A.
Published: May 2005

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Studies on 6‐[(Dimethylamino)methylene]aminouracil: A Facile One‐Pot Synthesis of Novel Pyrimido[4,5‐d]pyrimidine Derivatives.
Authors: Prajapati Dipak , Thakur Ashim J.
Published: May 2005

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Base‐Induced Generation of Aryl(1,2,3‐triazol‐1‐yl)carbenes from 1‐[(N‐Phenylsulfonyl)benzohydrazonoyl]‐1,2,3‐triazoles and Their Ring Enlargement to 3‐Aryl‐1,2,4‐triazines.
Authors: Tanaka Yuumo , Oda Shuji , Ito Suketaka , Kakehi Akikazu
Published: May 2005

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Microwave‐Assisted Synthesis of Some New Isoxazolyl‐[1,3,5]‐triazinan‐2‐ones and Isoxazolyl‐[1,3,5]‐oxadiazinan‐4‐ones in Dry Media.
Authors: Rajanarendar E. , Afzal Md. , Ramu K.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
A Cyclopropane Fragmentation Approach to Heterocycle Assembly: A Convergent Synthesis of Oxepanes.
Authors: O'Neil Kerry E. , Kingree Seth V. , Minbiole Kevin P. C.
Published: May 2005

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A New Method for the Lactonization of ω‐Hydroxy Carboxylic Acids with Di‐2‐thienyl Carbonate by the Promotion of DMAP and Iodine.
Authors: Oohashi Yoshiaki , Fukumoto Kentarou , Mukaiyama Teruaki
Published: May 2005

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New Catalytic Route to Functionalized Vinylboronates.
Authors: Marciniec Bogdan , Jankowska Magdalena , Pietraszuk Cezary
Published: May 2005

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Conjugate Additions of a Simple Monosilylcopper Reagent with Use of the CuI×DMS Complex: Stereoselectivities and a Dramatic Impact by DMS.
Authors: Dambacher Jesse , Bergdahl Mikael
Published: May 2005

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Synthesis and Reactions of Cyclic Silylboranes.
Authors: Suginome Michinori , Noguchi Hiroyoshi , Hasui Tomoaki , Murakami Masahiro
Published: May 2005

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Regioselectivity in Diels—Alder Reactions of Thiazolo[3,2‐d][1,4,2]diazaphospholes and Related Compounds.
Authors: Bansal Raj K. , Karaghiosoff Konstantin , Gupta Neelima , Kabra Vijaya , Mahnot Ruchi , Sharma Dinesh C. , Munjal Renu , Kumawat Surendra K.
Published: May 2005

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Arylation of 6H‐Dibenzo[c,e][1,2λ5]oxaphosphinine 6‐Oxide.
Authors: Beletskaya I. P. , Neganova E. G. , Veits Yu. A.
Published: May 2005

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Bis(ethylenedioxy)‐1,4,5,8‐tetraselenanaphthalene: The First Example of Tetraselenanaphthalene.
Authors: Watanabe Ryoji , Miyake Yoshihiro , Kuwatani Yoshiyuki , Iyoda Masahiko
Published: May 2005

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Reactions of gem‐Aryl‐Disubstituted Methylenecyclopropanes with Diaryl Diselenide in the Presence of Iodosobenzene Diacetate.
Authors: Shi Min , Wang Bao‐Yu , Li Jia
Published: May 2005

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Cheiloclines A—I. First Examples of Octacyclic Sesquiterpene‐Triterpene Hetero‐Diels—Alder Adducts.
Authors: Mesa‐Siverio Dulce , Chavez Haydee , Estevez‐Braun Ana , Ravelo Angel G.
Published: May 2005

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Isolation, Structural Elucidation, and Synthesis of Curcutetraol.
Authors: Muelhaupt Tanja , Kaspar Hannelore , Otto Sabine , Reichert Matthias , Bringmann Gerhard , Lindel Thomas
Published: May 2005

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Synthetic Studies of the Cyclic Depsipeptides Bearing the 3‐Amino‐6‐hydroxy‐2‐piperidone (Ahp) Unit. Total Synthesis of the Proposed Structure of Micropeptin T‐20.
Authors: Yokokawa Fumiaki , Inaizumi Akiko , Shioiri Takayuki
Published: May 2005

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Asymmetric Synthesis of γ‐Fluorinated α‐Amino Acid Derivatives.
Authors: Shendage Deepak M. , Froehlich Roland , Bergander Klaus , Haufe Guenter
Published: May 2005

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Synthesis of C‐Glycosyl Amino Acids: Scope and Limitations of the Tandem Tebbe/Claisen Approach.
Authors: Chambers David J. , Evans Graham R. , Fairbanks Antony J.
Published: May 2005

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Synthesis of Postulated Molecular Probes: Stereoselective Free‐Radical‐Mediated C‐Glycosylation in Tandem with Hydrogen Transfer.
Authors: Guindon Yvan , Bencheqroun Mohammed , Bouzide Abderrahim
Published: May 2005

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Hexafluoroacetone as Protecting and Activating Reagent: A New Approach to O‐Glycosides.
Authors: Burger Klaus , Kluge Michael , Koksch Beate , Fehn Susanna , Boettcher Christoph , Hennig Lothar , Mueller Gerhard
Published: May 2005

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Synthesis of 9‐Substituted Tetrahydrodiazepinopurines: Studies Toward the Total Synthesis of Asmarines.
Authors: Pappo Doron , Shimony Shiri , Kashman Yoel
Published: May 2005

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Ziziphine N, O, P and Q, New Antiplasmodial Cyclopeptide Alkaloids from Ziziphus oenoplia var. brunoniana.
Authors: Suksamrarn Sunit , Suwannapoch Narisara , Aunchai Natthachai , Kuno Mayuso , Ratananukul Piniti , Haritakun Rachada , Jansakul Chawewan , Ruchirawat Somsak
Published: May 2005

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Chemistry of Indoles Carrying a Basic Function. Part 9. Unexpected Cyclizations of Diketones Derived from Uhle′s Ketone.
Authors: Moldvai Istvan , Gacs‐Baitz Eszter , Temesvari‐Major Eszter , Incze Maria , Poppe Laszlo , Szantay Csaba
Published: May 2005

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A Synthesis of Sugar‐Modified S‐Adenosyl‐L‐Homocysteine (AdoHcy) Analogues as Inhibitors of AdoHcy Hydrolase.
Authors: Kim Beom‐Tae
Published: May 2005

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Synthesis and Structural Revision of Calafianin, a Member of the Spiroisoxazole Family Isolated from the Marine Sponge, Aplysina gerardogreeni.
Authors: Ogamino Takahisa , Nishiyama Shigeru
Published: May 2005

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A Facile Synthesis of Di‐O‐methyl Centrolobol
Authors: Panda Atulya Kumar
Published: May 2005

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Total Synthesis of (.+‐.)‐Mycothiazole and Formal Enantioselective Approach.
Authors: Le Flohic Alexandre , Meyer Christopher , Cossy Janine
Published: May 2005

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1‐Butyl‐3‐methylimidazolium 3,5‐Dinitro‐1,2,4‐triazolate: A Novel Ionic Liquid Containing a Rigid, Planar Energetic Anion
Authors: Katritzky Alan R. , Singh Shailendra , Kirichenko Kostyantyn , Holbrey John D. , Smiglak Marcin , Reichert W. Matthew , Rogers Robin D.
Published: May 2005

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Synthesis and Biological Activity of Some New Flavone Derivatives.
Authors: Bozdag‐Duendar Oya , Ceylan‐Uenluesoy Meltem , Altanlar Nurten , Ertan Rahmiye
Published: May 2005

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Synthesis of Nonclassical Quinazolinone Antifolates as Thymidylate Synthase Inhibitors and Their Antitumor Activity in vitro.
Authors: Baek Du‐Jong , Kang Tae‐Beom , Kim Hyun Ju
Published: May 2005

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Solid State Electrochemical Sensors for the Metallurgical Industry
Authors: Sequeira C. A. C. , Anastassakis G. N.
Published: May 2005

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Lanthanide Ions in Molecular Exchange Coupled Systems
Authors: Sutter Jean‐Pascal , Kahn Myrtil L.
Published: May 2005

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Nanostructured Materials: Reaction Kinetics and Stability
Authors: Perepezko John H.
Published: May 2005

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Electron‐Conducting Quantum Dot Solids: Novel Materials Based on Colloidal Semiconductor Nanocrystals
Authors: Vanmaekelbergh Daniel , Liljeroth Peter
Published: May 2005

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Disulfido Metal Carbonyl Complexes Containing Manganese
Authors: Adams Richard D. , Kwon O‐Sung , Miao Shaobin
Published: May 2005

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Luminescence from Lanthanoid(3+) Ions in Solution
Authors: Doessing Anders
Published: May 2005

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Oxidation of Sulfides to Sulfoxides. Part 1. Oxidation Using Halogen Derivatives.
Authors: Kowalski Piotr , Mitka Katarzyna , Ossowska Katarzyna , Kolarska Zofia
Published: May 2005

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Phenanthridines
Authors: Keller P. A.
Published: May 2005

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Isoquinolinones
Authors: Alvarez M. , Joule J. A.
Published: May 2005

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Isoquinolines
Authors: Alvarez M. , Joule J. A.
Published: May 2005

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Quinolines
Authors: Larsen R. D. , Cai D.
Published: May 2005

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Hybrid Polymeric Ligands and Polymer‐Supported Catalysts Containing Cyclophosphazenes
Authors: Chandrasekhar Vadapalli , Krishnan Venkatasubbaiah , Thilagar Pakkirisamy
Published: May 2005

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Enediynes: Recent Developments
Authors: Yus Miguel , Foubelo Francisco
Published: May 2005

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Application of Lipases in Kinetic Resolution of Racemates
Authors: Ghanem Ashraf , Aboul‐Enein Hassan Y.
Published: May 2005

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C—H Bond Activation by Iridium and Rhodium Complexes: Catalytic Hydrogen—Deuterium Exchange and C—C Bond‐Forming Reactions
Authors: Klei Steven R. , Tan Kian L. , Golden Jeffrey T. , Yung Cathleen M. , Thalji Reema K. , Ahrendt Kateri A. , Ellman Jonathan A. , Tilley T. Don , Bergman Robert G.
Published: May 2005

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Quinolines Spiro Annulated at Heterocyclic Fragment: Synthesis and Properties
Authors: Kouznetsov Vladimir V.
Published: May 2005

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Synthesis of Enamines, Enol Ethers and Related Compounds by Cross‐Coupling Reactions
Authors: Dehli Juan R. , Legros Julien , Bolm Carsten
Published: May 2005

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Benziporphyrins: Exploring Arene Chemistry in a Macrocyclic Environment
Authors: Stepien Marcin , Latos‐Grazynski Lechoslaw
Published: May 2005

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Interactions of Metal—Metal‐Bonded Antitumor Active Complexes with DNA Fragments and DNA
Authors: Chifotides Helen T. , Dunbar Kim R.
Published: May 2005

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QT Prolongation Through hERG K+ Channel Blockade: Current Knowledge and Strategies for the Early Prediction During Drug Development
Authors: Recanatini Maurizio , Poluzzi Elisabetta , Masetti Matteo , Cavalli Andrea , De Ponti Fabrizio
Published: May 2005

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Bacterial Resistance to β‐Lactam Antibiotics: Compelling Opportunism, Compelling Opportunity
Authors: Fisher Jed F. , Meroueh Samy O. , Mobashery Shahriar
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Glycopeptide and Lipoglycopeptide Antibiotics
Authors: Kahne Dan , Leimkuhler Catherine , Lu Wei , Walsh Christopher
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Molecular Insights into Aminoglycoside Action and Resistance
Authors: Magnet Sophie , Blanchard John S.
Published: May 2005

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Translation and Protein Synthesis: Macrolides
Authors: Katz Leonard , Ashley Gary W.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Bacterial Topoisomerase Inhibitors: Quinolone and Pyridone Antibacterial Agents
Authors: Mitscher Lester A.
Published: May 2005

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Biosynthesis and Mode of Action of Lantibiotics
Authors: Chatterjee Champak , Paul Moushumi , Xie Lili , van der Donk Wilfred A.
Published: May 2005

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Thiopeptide Antibiotics
Authors: Bagley Mark C. , Dale James W. , Merritt Eleanor A. , Xiong Xin
Published: May 2005

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Molecular Mechanisms Underlying Nonribosomal Peptide Synthesis: Approaches to New Antibiotics
Authors: Sieber Stephan A. , Marahiel Mohamed A.
Published: May 2005

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Antitumor Antibiotics: Bleomycin, Enediynes, and Mitomycin
Authors: Galm Ute , Hager Martin H. , van Lanen Steven G. , Ju Jianhua , Thorson Jon S. , Shen Ben
Published: May 2005

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Synthesis and Properties of Cationic π‐Conjugated Systems Stabilized by Bicyclo[2.2.2]octene Units
Authors: Komatsu Koichi , Nishinaga Tohru
Published: May 2005

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Approaching Highly Enantioselective Reductive Amination
Authors: Tararov Vitali I. , Boerner Armin
Published: May 2005

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Persistent π Radical Cations: Self‐Association and Its Steric Control in the Condensed Phase
Authors: Nishinaga Tohru , Komatsu Koichi
Published: May 2005

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Ferritins: Dynamic Management of Biological Iron and Oxygen Chemistry
Authors: Liu Xiaofeng , Theil Elizabeth C.
Published: May 2005

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Methods of Acrylonitrile Synthesis
Authors: Movsumzade E. M. , Dyumaeva I. V. , Rasulbekova T. I. , Mamed'yarova K. B. , Rekuta Sh. F.
Published: May 2005

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2003 Fred Beamish Award Lecture — Exploring the Dynamics of Biological Systems by Mass Spectrometry
Authors: Konermann Lars
Published: May 2005

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Affinity Processes Realized on High‐Flow‐Through Methacrylate‐Based Macroporous Monoliths
Authors: Platonova Galina A. , Tennikova Tatiana B.
Published: May 2005

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Application of Ionic Liquids in Analytical Chemistry
Authors: Liu Jing‐fu , Jonsson Jan Ake , Jiang Gui‐bin
Published: May 2005

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Nuclear Quadrupole Resonance Spectroscopy
Authors: Dillon K. B.
Published: May 2005

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Dynamics by EPR: Picosecond to Microsecond Time Scales
Authors: Van Doorslaer Sabine , Jeschke Gunnar
Published: May 2005

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Infrared Fluorescence, a Versatile Probe in Chemical Dynamics
Authors: Sarkar S. K. , Parthasarathy V.
Published: May 2005

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Ion Chemistry and Fragmentation
Authors: O'Hair Richard A. J.
Published: May 2005

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Effects of weekly paclitaxel or paclitaxel plus carboplatin on functionality and symptoms of geriatric patients with cancer as measured by a brief geriatric oncology module
Authors: Presant Cary A. , Thompson Erin , LeBerthon Brian , Vergara Lori , McGowen Priscilla
Published: May 2005

BACKGROUND

To measure functionality, symptoms, and quality of life in elderly patients, a geriatric oncology module (GOM) was developed that could be rapidly and effectively administered in community oncology practices.

METHODS

The GOM was validated by semi structured patient interviews. The authors tested 26 patients receiving chemotherapy with paclitaxel or paclitaxel plus carboplatin to determine the effect of drug treatment on functionality, symptoms, and quality of life (QOL).

RESULTS

Chemotherapy stabilized or improved functionality, symptoms, and QOL in 75%, 86%, and 76% of patients, respectively. This GOM was easily implemented in a busy community oncology practice.

CONCLUSIONS

Weekly paclitaxel and paclitaxel plus carboplatin produced measurable palliation in geriatric oncology patients. This GOM may be useful in the assessment of specific chemotherapeutic interventions in elderly patients with cancer in community oncology practices. Cancer 2005. © 2005 American Cancer Society.
Clinical and immunohistologic typing of salivary duct carcinoma
Authors: Jaehne Michael , Roeser Kerstin , Jaekel Thorsten , Schepers Jan David , Albert Natalie , Löning Thomas
Published: May 2005

BACKGROUND

Due to the low incidence of salivary duct carcinoma (SDC), only limited data in regard to the biologic behavior of this tumor and its immunohistochemical characteristics are available. The authors analyzed the clinical, molecular, and genetic profile of SDC and identified prognostic factors.

METHODS

The follow‐up of 50 patients with SDC was obtained and paraffin‐embedded tumor samples were examined immunohistochemically. In all samples, the expression of Ki‐67, HER‐2, and the oncoproteins p16 and p53 was examined immunohistochemically, followed by a mutation analysis of p16 and p53. The survival rate was calculated by the Kaplan–Meier method and prognostic variables were analyzed with the log‐rank test.

RESULTS

SDC predominantly effected male patients (66%) in their 7th decade of life. SDC mainly occurred in the parotid gland (78%; submandibular gland, 12%; minor salivary glands, 10%). Approximately two‐thirds of the patients (33 of 50) presented with a T3/T4 tumor. In 28 patients (56%), cervical lymph node metastasis was present at the time of diagnosis. Local disease recurrence was observed in 48% of patients an average of 17.4 months after initial treatment. Distant disease metastasis developed in 48% of patients an average of 29 months after initial treatment. The average overall survival period was 56.2 months. In the current study, 20.6% of the probes with positive HER‐2/neu expression were (+++) positive. p53 was expressed in 83.9% of the tumor samples. In 11.8% of the tumor samples, there was a lack of p16 expression.

CONCLUSIONS

Mutations of the p53 gene were more frequent in tumor samples with (++) and (+++) immunoreactivity and mainly affected exons 7 and 8. A mutation of the p16 gene was only found in 1 tumor sample. Expression of HER‐2/neu and p53 was statistically linked (P < 0.05) to early local disease recurrence, distant disease metastasis, and survival rates. Cancer 2005. © 2005 American Cancer Society.
How should corporations deal with environmental scepticism?
Authors: Jacques Peter
Published: May 2005

Environmental scepticism, or the effort to ‘debunk’ environmental claims, is gaining visibility in world affairs. This complicates the position of corporations that are genuine in their efforts for conscientious productive work. This article explains some of the primary movements found in scepticism and argues that the truth of the sceptical claims is sufficiently contested that corporations should err on the side of caution and treat environmental scepticism as a political movement with a narrow support base, not as a scientific basis for policy. Copyright © 2005 John Wiley & Sons, Ltd and ERP Environment.
Perfluorinated Alkoxyaluminate Salts of Cationic Brønsted Acids: Synthesis, Structure, and Characterization of [H(OEt2)2][Al{OC(CF3)3}4] and[H(THF)2][Al{OC(CF3)3}4]
Authors: Krossing Ingo , Reisinger Andreas
Published: May 2005

The strong cationic Brønsted acids [H(OEt2)2][Al{OC(CF3)3}4] (1) and [H(THF)2][Al{OC(CF3)3}4] (2) were prepared in up to 95 % yield by reacting stoichiometric amounts of diethyl ether/THF solutions of Li[Al{OC(CF3)3}4] and HX (X = Cl, Br), removing the solvent, and extracting the residue with CH2Cl2. Compounds 1 and 2 were characterized by multinuclear NMR and IR spectroscopy as well as by their single crystal X‐ray structures and additional quantum chemical calculations. The cation in 1 probably contains an unsymmetrical O–H···O hydrogen bond, while in 2 the protic hydrogen atom was not found in the difference Fourier map. From an analysis of all published [H(OEt2)2]+ structures, we show that for an unsymmetrical H‐bridge further rearrangement of the structure occurs leading to the structural type III that may formally be viewed as ethanol coordinating to an ethyl cation. This point of view has hitherto been neglected in the discussion of the nature of short, strong, low‐barrier H‐bonds, although it needs to be accounted for. Both 1 and 2 are suitable starting materials to introduce the weakly coordinating and chemically very robust [Al{OC(CF3)3}4]– anion by protonolysis. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Synthesis, Structure, and Properties of μ‐Oxo‐Bridged FeIII2 and Heterometallic Azide‐Bridged FeIII2CuII Complexes of a Picolinamide In‐Plane Ligand
Authors: Domínguez‐Vera José M. , Suárez‐Varela José , Ben Maimoun Ikram , Colacio Enrique
Published: May 2005

A new μ‐oxodiiron(III) complex [{FeIII(bpc)(H2O)}2O] (1) with the bis(picolinamide) N4 in‐plane ligand 4,5‐dichloro‐1,2‐bis(pyridine‐2‐carboxamido)benzene (H2bpc) has been prepared by the reaction of [Fe(bpc)Cl(H2O)] with a stoichiometric amount of cyanide, and characterized by X‐ray structure analysis. The IR and UV/Vis spectroscopic results match well with those expected from the respective previously established spectro‐structure correlation. Likewise, the temperature dependence of the magnetic susceptibility shows the existence of a strong antiferromagnetic coupling between the iron(III) centers [S = 5/2; with J = –108.10(3) cm–1] that is consistent with the radial and angular overlap Weihe–Güdel model in μ‐oxodiiron(III) complexes. Two heterometallic FeIII‐CuIIFeIII (2) and FeIIINiIIFeIII (3) complexes have been prepared from the reaction between [FeIII(bpc)(N3)2] and [Cu(meso‐CTH)]2+ or [Ni(meso‐CTH)]2+ (CTH = 5,7,7,12,14,14‐hexamethyl‐1,4,8,11‐tetraazacyclotetradecane), respectively. The structure of 2 consists of heterometallic FeIIICuIIFeIII units formed by the simultaneous coordination of two [FeIII(bpc)(N3)2] units to the central [Cu(meso‐CTH)] units through a μ1,3‐azide bridging ligand. However, the structure of 3 contains isolated [FeIII(bpc)(N3)2]– and [Ni(meso‐CTH)]2+ ions. The treatment of the magnetic data of 2 revealed the existence of a small ferromagnetic interaction between FeIII and CuII metal ions, with JFeCu = 3.24(7) cm–1. The existence of 2 opens up the possibility of obtaining, in a rational manner, azide‐bridged heterometallic complexes starting from the block precursor [FeIII(bpc)(N3)2]–. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Syntheses, Reactivity, and X‐ray Structure Analyses of the Dimeric Pentaphosphides [(tBu3Si)3P5M2]2 (M = Na, Ag) and the Bicyclo[2.1.0]pentaphosphane (tBu3Si)3P5
Authors: Lerner Hans‐Wolfram , Margraf Günter , Kaufmann Linda , Bats Jan W. , Bolte Michael , Wagner Matthias
Published: May 2005

The sodium pentaphosphide dimer [(tBu3Si)3P5Na2(THF)]2 has been synthesized in high yield from the reaction of four equivalents of the sodium silanide tBu3SiNa with P4. X‐ray quality crystals of the sodium pentaphosphide dimer [(tBu3Si)3P5Na2(THF)]2 (monoclinic, P21/n) were grown from benzene. The sodium pentaphosphide (tBu3Si)3P5Na2 can be oxidized with one equivalent of TCNE to give the bicyclo[2.1.0]pentaphosphane (tBu3Si)3P5; it also reacts with AgOCN to give the silver pentaphosphide [(tBu3Si)3P5Ag2]2 (monoclinic, P21/n). Crystals of the pentaphosphane (tBu3Si)3P5 (monoclinic, P21/c) suitable for X‐ray diffraction were obtained from hexane at –25 °C. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
A Ruthenium(II)‐Complexed Rotaxane Whose Ring Incorporates a 6,6′‐Diphenyl‐2,2′‐bipyridine: Synthesis and Light‐Driven Motions
Authors: Collin Jean‐Paul , Jouvenot Damien , Koizumi Masatoshi , Sauvage Jean‐Pierre
Published: May 2005

By incorporating a 6,6'‐diphenyl‐2,2'‐bipyridine (dpbipy) fragment in a ring, endo coordination of a ruthenium(II) center is performed selectively and almost quantitatively. The threaded system, containing a helical fragment, could be fully characterized. When the terminal functions of the rod‐shaped helical complex threaded through the macrocycle are phenol groups, the complete rotaxane is prepared by the classical Williamson stoppering reaction in moderate yield. Light‐induced motions of the unstoppered system (pseudorotaxane) and the real rotaxane have been studied. Under visible light irradiation, quantitative decoordination of the dpbipy‐containing ring is observed, leading to the separate fragments (ring and helical thread) or to a new rotaxane (uncoordinated ring threaded by the dumbbell). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Characterization of Oligomers of AlCl: Al–Cl versus Al–Al Bonding
Authors: Himmel Hans‐Jörg
Published: May 2005

Oligomers of AlCl have been characterized. By using the matrix isolation technique, the dimer Al2Cl2, which exhibits a D2h‐symmetric ring structure, was generated in significant quantities and analyzed by its IR and Raman spectra in combination with quantum chemical calculations. The structures of the trimer and tetramer have also been evaluated. A surprising result is that the minimum energy structure of the trimer (Cs symmetry) features direct Al–Al bonds, two terminal Al–Cl bonds, and one bridging Cl atom. A weak, isotopically structured IR band can be assigned to the antisymmetric ν(Al–Clt) mode of this trimer (Clt denotes a terminal Cl atom). The enthalpy change for each of the oligomerization steps has been calculated. For the dimerization of AlCl to give Al2Cl2, the Gibbs energy change was calculated as a function of temperature at different pressures. It turns out that neither the Al2Cl2 dimer nor any higher oligomers are present in significant quantities in the gas phase, at least under the conditions of the experiments. The thermodynamic properties show that matrix isolation represents the optimal method of generating and characterizing these species. On the basis of the experimental results the barrier for dimerization of AlCl should be next to zero. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Electro‐Conducting Properties of Charge‐Transfer Salts Based on Cationic and Anionic Platinum Dithiolenes − Crystal Structure of [Pt(Me2pipdt)2][Pt(dtcr)2] (Eur. J. Inorg. Chem. 10/2005)
Authors: Deplano Paola , Mercuri Maria Laura , Marchiò Luciano , Pilia Luca , Salidu Marco , Serpe Angela , Congiu Francesco , Sanna Samuele
Published: May 2005

The cover picture shows [Pt(Me2pipdt)2][Pt(dtcr)2] (Me2pipdt = N,N′‐dimethylpiperazine‐2,3‐dithione; dtcr = dithiocroconate), an ion‐pair CT salt formed by redox‐active cationic and anionic platinum−dithiolenes arranged in an infinite, alternate one‐dimensional stack. This salt exhibits a strong absorption in the near‐infrared region that is assigned to a CT transition from the anion to the cation. NIR CT bands, and semiconducting and photoconducting properties are also observed for similar salts obtained on varying the anion. These properties strongly depend on the degree of electron donation, which in turn depends on the redox potential and on the planarity of the ionic components. Details are discussed in the article by P. Deplano et al. on p. 1829 ff. This work has been performed in the framework of European COST action D14‐003 “Towards New Molecular Inorganic Conductors”.
The significance of channel recharge rates for estimating debris‐flow magnitude and frequency
Authors: Jakob Matthias , Bovis Michael , Oden Marian
Published: May 2005

The quantification of debris‐flow hazard requires estimates of debris‐flow frequency and magnitude. Several methods have been proposed to determine the probable volume of future debris flows from a given basin, but most have neglected to account for debris recharge rates over time, which may lead to underestimation of debris‐flow volumes in basins with rare debris flows. This paper deals with the determination of debris recharge rates in debris‐flow channels based on knowledge of debris storage and the elapsed time since the last debris flow. Data are obtained from coastal British Columbia and a relation is obtained across a sample of basins with similar terrain and climatic conditions. For Rennell Sound on the west coast of the Queen Charlotte Islands, the power‐law relation for area‐normalized recharge rate, Rt, versus elapsed time, te was Rt = 0·23te−0·58 with an explained variance of 75 per cent. A difference in recharge rates may exist between creeks in logged and unlogged forested terrain. The power function for undisturbed terrain was Rt = 0·20te−0·49, while the function for logged areas was Rt = 0·30te−0·77. This result suggests that for the same elapsed time since the last debris flow, clearcut gullies tend to recharge at a slower rate than creeks in old growth forest. This finding requires verification, particularly for longer elapsed times since debris flow, but would have important implications for forest resource management in steep coastal terrain. This study demonstrates that commonly used encounter probability equations are inappropriate for recharge‐limited debris flow channels. Copyright © 2005 John Wiley & Sons, Ltd.
Cuparene‐Derived Sesquiterpenes from the Chinese Red Alga Laurencia okamurai Yamada
Authors: Mao Shui‐Chun , Guo Yue‐Wei
Published: May 2005

Four new cuparene‐derived sesquiterpenes, laureperoxide (1), 10‐bromoisoaplysin (2), isodebromolaurinterol (3), and 10‐hydroxyisolaurene (4), together with seven known, related sesquiterpenes, 5–11, have been isolated from the red alga Laurencia okamurai. Their structures were determined on the basis of detailed spectroscopic analyses and comparison with known compounds. Compounds 8–11 were shown for the first time to represent true natural products, and the full 1H‐ and 13C‐NMR assignments of 5 are reported for the first time.
Synthesis and Photochemical Evaluation of Iodinated Squarylium Cyanine Dyes
Authors: Santos Paulo F. , Reis Lucinda V. , Duarte Isabel , Serrano João P. , Almeida Paulo , Oliveira Anabela S. , Ferreira Luís F. Vieira
Published: May 2005

Several (multiply) iodinated squarylium cyanine dyes of type 1 and 8 (see Scheme and Table), derived from 1,3‐benzothiazole and 6‐iodo‐1,3‐benzothiazole, were synthesized as potential new photosensitizers, with absorptions in the 700‐nm region. Their ability to generate singlet oxygen (1O2) was assessed by luminescence‐decay measurement in the near‐IR. Some of these new dyes show interesting photophysical properties, and may be potentially used in photodynamic therapy (PDT).
Modulation of the Lifetime of Water Bound to Lanthanide Metal Ions in Complexes with Ligands Derived from 1,4,7,10‐Tetraazacyclododecane Tetraacetate (DOTA)
Authors: Zhang Shanrong , Jiang Xiuyan , Sherry A. Dean
Published: May 2005

A series of di‐ and tetraamide derivatives of DOTA were synthesized, and their lanthanide(III) complexes were examined by multinuclear 1H‐, 13C‐, and 17O‐NMR spectroscopy, and compared with literature data of similar, known complexes (Table). All ligands formed structures similar to the parent [LnIII(DOTA)]− complexes, with four N‐atoms and four O‐atoms from DOTA and one O‐atom from the inner‐sphere water molecules. Interestingly, the lifetimes τM of the inner‐sphere, metal‐bound water molecules vary widely, ranging from nano‐ to milliseconds, depending on the identity of the pendent amide side chains. In general, positively charged [LnIII(DOTA‐tetraamide)]3+ complexes display the longest residence times (high τM values), while complexes with additional charged functional groups on the extended amides display much smaller τM values, even when the side groups are not directly coordinated to the central Ln3+ ions. The design of novel [LnIII(DOTA‐tetraamide)]3+ complexes with a wide, tunable range of τM values is of prime importance for the application of fast‐responding, paramagnetic chemical‐exchange‐saturation‐transfer (PARACEST) imaging agents used for the study of physiological and metabolic processes.
Selective Double Functionalization of meso‐Tetraphenylporphyrin Complexes on the Same Pyrrole Unit by Tandem Electrophilic/Nucleophilic Aromatic Substitution
Authors: Ostrowski Stanisław , Raczko Anna M.
Published: May 2005

The mono‐nitrated meso‐tetraphenylporphyrin (TPP) complex 2 could be readily functionalized on the substituted pyrrole ring with yields of up to 83%. These transformations were achieved via aromatic substitution with carbanions generated from diverse functionalized compounds containing different leaving groups (3a–g, Scheme 1). The resulting TPP compounds 4a–g, bearing two different β‐substituents on the same pyrrole ring, may be further manipulated. This, in turn, should allow one to tune the solubility of TPP derivatives used in photodynamic cancer therapy.
Two Novel Olean Triterpenoids from Celastrus hypoleucus
Authors: Wang Kui‐wu , Sun Hong‐xiang , Wu Bin , Pan Yuan‐jiang
Published: May 2005

Two new triterpenoids, (3β)‐olean‐12‐ene‐3,23‐diol (1) and (6α)‐6‐hydroxyolean‐12‐en‐3‐one (2) were isolated from the MeOH extract of the stalks of Celastrus hypoleucus (Oliv.) Warb., together with the seven known compounds (3β,22α)‐3,22‐dihydroxyolean‐12‐en‐29‐oic acid, β‐amyrin and β‐amyrin palmitate, wilforlide A, wilforilide B, palmitic acid, and β‐sitosterol. Their structures were elucidated on the basis of spectroscopic data and, in the case of 2, by X‐ray crystallography. Compound 1 showed moderate cytotoxicity against human cervical squamous carcinoma (Hela) cells.