bluuebunny/crossref_metadata_2025 huggingface dataset:
Combined Multiple Claisen Rearrangement and Ring‐Closing Metathesis as a Route to Naphthalene, Anthracene, and Anthracycline Ring Systems.
Authors: Chattopadhyay Shital K. , Pal Benoy K. , Maity Susama
Published: April 2004

For Abstract see ChemInform Abstract in Full Text.
Fluorinated (Hetero)cycles via Ring‐Closing Metathesis of Fluoride‐ and Trifluoromethyl‐Functionalized Olefins.
Authors: De Matteis Valeria , van Delft Floris L. , de Gelder Rene , Tiebes Joerg , Rutjes Floris P. J. T.
Published: April 2004

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Stoichiometric and Catalytic Deuterium and Tritium Labeling of “Unactivated” Organic Substrates with Cationic Ir(III) Complexes.
Authors: Skaddan Marc B. , Yung Cathleen M. , Bergman Robert G.
Published: April 2004

For Abstract see ChemInform Abstract in Full Text.
Tetraorganoindates as Nucleophilic Coupling Partners in Pd‐Catalyzed Cross‐Coupling Reactions.
Authors: Lee Phil Ho , Lee Sung Wook , Seomoon Dong
Published: April 2004

For Abstract see ChemInform Abstract in Full Text.
Stereochemistry of the Synthesis of 1‐(2‐Cyano‐2‐methoxyiminoacetyl)‐3‐ethylurea and Its E‐Configuration Crystal Structure.
Authors: Greci Lucedio , Carloni Patricia , Mandrioli Odofredo , Righi Lara , Rizzoli Corrado , Sgarabotto Paolo
Published: April 2004

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New Acrylate Systems: Derivatives of β‐SF5‐Acrylic Acid
Authors: Winter R. W. , Dodean R. , Holmes L. , Gard G. L.
Published: April 2004

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Geminal Systems. Part 50. Synthesis and Alcoholysis of N‐Acyloxy‐N‐alkoxy Derivatives of Ureas, Carbamates, and Benzamides.
Authors: Shtamburg V. G. , Klots E. A. , Pleshkova A. P. , Avramenko V. I. , Ivonin S. P. , Tsygankov A. V. , Kostyanovsky R. G.
Published: April 2004

For Abstract see ChemInform Abstract in Full Text.
Formamidine Ureas as Tunable Electrophiles.
Authors: Diaz David D. , Finn M. G.
Published: April 2004

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Efficient Conversions of Carboxylic Acids into O‐Alkyl, N‐Alkyl and O,N‐Dialkylhydroxamic Acids.
Authors: Katritzky Alan R. , Kirichenko Nataliya , Rogovoy Boris V.
Published: April 2004

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Hydrogenative Cleavage of Azo Compounds Catalyzed by Commercial Zinc Dust Using Ammonium Acetate.
Authors: Srinivasa G. R. , Abiraj K. , Gowda D. Channe
Published: April 2004

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Synthesis, CNS and Chloroquin Resistance Reversal Activity of Benzenepropanamines.
Authors: Sharma V. L. , Bhandari Kalpana , Shankar Girija , Singh H. K. , Srivastava Pratima , Pandey V. C.
Published: April 2004

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A Convenient, Efficient, and Environmentally Benign Method for Preparing Nitroanilines.
Authors: Liu Xiao‐zhi , Lu Shi‐wei
Published: April 2004

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Direct Carbamoylation of Alkenyl Halides.
Authors: Cunico Robert F. , Maity Bikash C.
Published: April 2004

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A Convenient Method for the Synthesis of α‐Imidostyrenes from Styrenes and Imides via Diphenylstyrylsulfonium Salts.
Authors: Yamanaka Hiroyuki , Mukaiyama Teruaki
Published: April 2004

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Useful Synthesis of Aryl Cinnamates: Synthesis of Difengpin.
Authors: Mali Raghao S. , Papalkar Abhijit S.
Published: April 2004

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Ionic Liquid‐Accelerated Arylation of Sodium Arenesulfinates with Diaryliodonium Salts Used for the Synthesis of Diaryl Sulfones.
Authors: Wang Feng‐Yan , Chen Zhen‐Chu , Zheng Qin‐Guo
Published: April 2004

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Medium‐Sized Cyclophanes. Part 66. Through‐Space Electronic Interactions on Acylation of 8,16‐Disubstituted [2.2]Metacyclophanes.
Authors: Yamato Takehiko , Okabe Ryo , Shigekuni Mitsuaki , Furukawa Tsuyoshi
Published: April 2004

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[Bmim]PF6/RuCl3×xH2O: A Novel and Recyclable Catalytic System for the Oxidative Coupling of β‐Naphthols.
Authors: Yadav Jhillu S. , Reddy Basi V. S. , Gayathri Kamakolanu Uma , Prasad Attaluri R.
Published: April 2004

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Base‐Induced Photocyclization of 1,2‐Diaryl‐1‐tosylethenes. A Mechanistically Novel Approach to Phenanthrenes and Phenanthrenoids.
Authors: Almeida Jesus F. , Castedo Luis , Fernandez Dolores , Neo Ana G. , Romero Victor , Tojo Gabriel
Published: April 2004

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Synthesis of β‐Lactam from Acyl(arylcarbamoyl)‐S,S‐bis(alkylketene) Dithioacetal: Revised Structure of the Product from Thermal Cyclization of Acyl(arylcarbamoyl)‐S,S‐bis(alkylketene) Dithioacetal.
Authors: Choi Eun Bok , Yon Guy Hwan , Lee Hyeon Kyu , Yang Hee Cheol , Yoo Chung Youl , Pak Chwang Siek
Published: April 2004

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Gallium(III) Chloride‐Catalyzed Double Insertion of Isocyanides into Epoxides.
Authors: Bez Ghanashyam , Zhao Cong‐Gui
Published: April 2004

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Synthesis and Reaction of Bromoallylsilane: A Short Access to β,γ‐Disubstituted α‐Methylene‐γ‐butyrolactone.
Authors: Uenishi Jun'ichi , Ohmi Masashi
Published: April 2004

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Synthesis of 3‐(2,4‐Dinitrophenyl)hydrazones of 5‐Arylfuran‐2,3‐diones.
Authors: Kozminykh V. O. , Belyaev A. O. , Kozminykh E. N.
Published: April 2004

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New Synthesis of Benzo[b]furan and Indole Derivatives from 1,1‐Dibromo‐1‐alkenes Using a Tandem Pd‐Assisted Cyclization—Coupling Reaction.
Authors: Thielges Sabine , Meddah Emilie , Bisseret Philippe , Eustache Jacques
Published: April 2004

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Synthesis and Transformations of 3‐Ethoxycarbonyl‐2‐(N‐R‐thioureido)thiophenes.
Authors: Chumakova L. Yu. , Demchenko A. M. , Krasovsky A. N. , Dolishnyak T. V. , Lozinskii M. O.
Published: April 2004

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A Powerful New Strategy for Diversity‐Oriented Synthesis of Pyrroles from Donor—Acceptor Cyclopropanes and Nitriles.
Authors: Yu Ming , Pagenkopf Brian L.
Published: April 2004

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A One‐Step Route to Azomethine Ylides via Chloroiminium Salts.
Authors: Anderson Rosaleen J. , Batsanov Andrei S. , Belskaia Natalia , Groundwater Paul W. , Meth‐Cohn Otto , Zaytsev Andrey
Published: April 2004

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Synthesis of 3‐Methylenepyrrolidines by Palladium‐Catalyzed [3 + 2] Cycloaddition of Alkylidenecyclopropanes with Imines.
Authors: Oh Byoung Ho , Nakamura Itaru , Saito Shinichi , Yamamoto Yoshinori
Published: April 2004

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Formation and Spectroscopic Characterization of the Dioxygen Adduct of a Heme—Cu Complex Possessing a Cross‐Linked Tyrosine—Histidine Mimic: Modeling the Active Site of Cytochrome c Oxidase.
Authors: Liu Jin‐Gang , Naruta Yoshinori , Tani Fumito , Chishiro Takefumi , Tachi Yoshimitsu
Published: April 2004

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Synthesis and Bergman Cyclization of a β‐Extended Porphyrenediyne.
Authors: Spence John D. , Cline Eric D. , LLagostera Domingo M. , O'Toole Patrick S.
Published: April 2004

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Synthesis of 2‐Substituted Indoles by Palladium‐Catalyzed Heteroannulation with Pd—NaY Zeolite Catalysts.
Authors: Hong Ki Bum , Lee Chul Wee , Yum Eul Kgun
Published: April 2004

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Thermal Rearrangement of 3‐Hydroxy‐1H,3H‐quinoline‐2,4‐diones to 3‐Acyloxy‐2,3‐dihydro‐1H‐indol‐2‐ones.
Authors: Klasek Antonin , Koristek Kamil , Kafka Stanislav , Kosmrlj Janez
Published: April 2004

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Electrocatalytic Transformation of Malononitrile and Cycloalkylidenemalononitriles into Spirotricyclic and Spirotetracyclic Compounds Containing Cyclopropane and Pyrroline Fragments.
Authors: Elinson M. N. , Fedukovich S. K. , Zaimovskaya T. A. , Vereshchagin A. N. , Nikishin G. I.
Published: April 2004

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Perfluoro‐4‐methyl‐1,3‐dioxole: A New Monomer for High‐Tg Amorphous Fluoropolymers.
Authors: Russo Antonio , Navarrini Walter
Published: April 2004

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Imidazole Derivatives as New Potent and Selective 20‐HETE Synthase Inhibitors.
Authors: Nakamura Toshio , Kakinuma Hiroyuki , Umemiya Hiroki , Amada Hideaki , Miyata Noriyuki , Taniguchi Kazuo , Bando Kagumi , Sato Masakazu
Published: April 2004

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Reaction Products of Nitronyl Nitroxyl Radicals with Acids.
Authors: Nosova K. E. , Tretyakov E. V. , Romanenko G. V. , Ovcharenko V. I.
Published: April 2004

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Synthesis of 2‐Substituted Benzimidazoles by Reaction of o‐Phenylenediamine with Aldehydes in the Presence of Sc(OTf)3.
Authors: Nagata Kazuhiro , Itoh Takashi , Ishikawa Hiroyuki , Ohsawa Akio
Published: April 2004

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4,5‐Disubstituted‐1,3‐oxazolidin‐2‐imine Derivatives: A New Class of Orally Bioavailable Nitric Oxide Synthase Inhibitor.
Authors: Ueda Shigeo , Terauchi Hideo , Yano Akihiro , Ido Motoharu , Matsumoto Masashi , Kawasaki Motoji
Published: April 2004

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Copper‐Catalyzed N‐Arylation of 2‐Oxazolidinones. An Expeditious Route to Toloxatone.
Authors: Cacchi Sandro , Fabrizi Giancarlo , Goggiamani Antonella
Published: April 2004

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Transformations of Nitrates (Nitro Esters) of Amino Alcohols Involving Both Functions. Part 1. Reaction with Alkali Metal Hydrogen Carbonates.
Authors: Korepin A. G. , Galkin P. V. , Glushakova N. M. , Perepelkina E. K. , Loginova M. V. , Lodygina V. P. , Ol'khov Yu. A. , Eremenko L. T.
Published: April 2004

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Metalation Reactions. 34. Synthesis of 2‐(1‐Hydroxy‐1‐arylethyl)‐1,3‐benzoxathiol‐3‐oxide Derivatives.
Authors: Cabiddu Salvatore , Cadoni Enzo , Melis Stefana , Ianni Alen , Bernard Angela M. , Cabiddu Maria G. , De Montis Stefania , Fattuoni Claudia , Ianelli Sandra
Published: April 2004

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Synthesis of Methyl 2‐(5‐Arylidene‐2,4‐dioxotetrahydrothiazol‐3‐yl)propionates
Authors: Popov‐Pergal K. , Cuckovic L. , Rancic M. , Pergal M. , Djokovic D.
Published: April 2004

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Four‐Component Coupling Reactions of Silylacetylenes, Allyl Carbonates, and Trimethylsilyl Azide Catalyzed by a Pd(0)—Cu(I) Bimetallic Catalyst. Fully Substituted Triazole Synthesis from Seemingly Internal Alkynes.
Authors: Kamijo Shin , Jin Tienan , Yamamoto Yoshinori
Published: April 2004

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Transformation of N‐(5‐Acetyl‐6‐methyl‐2‐oxo‐2H‐pyran‐3‐yl)benzamide with Hydrazines in the Presence of an Acidic Catalyst.
Authors: Vranicar Lidija , Polanc Slovenko , Kocevar Marijan
Published: April 2004

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Synthesis of 6‐Amino‐4‐aryl‐5‐cyano‐3‐ (3‐cyanopyridin‐2‐ylthiomethyl)‐2,4‐dihydropyrano[2,3‐c]pyrazoles and Their Hydrogenated Analogues. Molecular Structure of 6‐Amino‐5‐cyano‐3‐(3‐cyano‐4,6‐dimethylpyridin‐2‐ylthiomethyl)‐4‐ (2‐nitrophenyl)‐2,4‐dihydropyrano[2,3‐c]pyrazole.
Authors: Rodinovskaya L. A. , Gromova A. V. , Shestopalov A. M. , Nesterov V. N.
Published: April 2004

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Highly Potent PDE4 Inhibitors with Therapeutic Potential.
Authors: Ochiai Hiroshi , Ohtani Tazumi , Ishida Akiharu , Kusumi Kensuke , Kato Masashi , Kohno Hiroshi , Kishikawa Katuya , Obata Takaaki , Nakai Hisao , Toda Masaaki
Published: April 2004

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Design and Synthesis of Novel Cyanoguanidine ATP‐Sensitive Potassium Channel Openers for the Treatment of Overactive Bladder.
Authors: Perez‐Medrano Arturo , et al. et al.
Published: April 2004

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A Novel Ring Transformation of Nitropyrimidinone Leading to Polyfunctionalized Pyridones.
Authors: Nishiwaki Nagatoshi , Morimura Hiromi , Matsushima Kazuo , Tamura Mina , Ariga Masahiro
Published: April 2004

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Asymmetric Synthesis of 1‐Substituted 1,2,3,4‐Tetrahydroisoquinolines by Asymmetric Electrophilic α‐Amidoalkylation Reactions.
Authors: Ludwig Matthias , Polborn K. , Wanner Klaus T.
Published: April 2004

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One‐Pot Synthesis of 4,6‐Diaryl‐3‐cyanopyridine‐2(1H)‐thiones and Their Transformation to Substituted Thieno[2,3‐b;4,5‐b]dipyridines and Pyrido[3′,2′:4,5]thieno[3,2‐d]pyrimidines.
Authors: Shestopalov A. M. , Nikishin K. G. , Gromova A. V. , Rodinovskaya L. A.
Published: April 2004

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A Synthesis of Chiral 1,1,3‐Trisubstituted 1,2,3,4‐Tetrahydro‐β‐carbolines by the Pictet—Spengler Reaction of Tryptophan and Ketones: Conversion of (1R,3S)‐Diastereomers into Their (1S,3S)‐Counterparts by Scission of the C(1)—N(2) Bond.
Authors: Horiguchi Yoshie , Nakamura Masayoshi , Saitoh Toshiaki , Sano Takehiro
Published: April 2004

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Concise and Efficient Synthesis of 4‐Fluoro‐1H‐pyrrolo[2,3‐b]pyridine.
Authors: Thibault Carl , L'Heureux Alexandre , Bhide Rajeev S. , Ruel Rejean
Published: April 2004

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Radical Cyclization Cascade Involving Ynamides: An Original Access to Nitrogen‐Containing Heterocycles.
Authors: Marion Frederic , Courillon Christine , Malacria Max
Published: April 2004

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Condensation of 1‐Substituted 5‐Aminopyrazoles with β‐Dicarbonyl Compounds.
Authors: Nam N. L. , Grandberg I. I. , Sorokin V. I.
Published: April 2004

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4‐(3‐Cyanopyridin‐2‐ylthio)acetoacetates in Synthesis of Heterocycles.
Authors: Rodinovskaya L. A. , Shestopalov A. M. , Gromova A. V.
Published: April 2004

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Reactions of 2‐Hydroxynaphthazarins with Cyclohexane‐1,2‐dione as a New Method for the Synthesis of Pyranonaphthazarin Systems.
Authors: Shestak O. P. , Balaneva N. N. , Anufriev V. Ph. , Denisenko V. A. , Glazunov V. P. , Novikov V. L.
Published: April 2004

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Pyrrolopyrimidines. Part 5. Reaction of 6‐Amino‐1,3‐dimethylpyrrolo[3,4‐d]pyrimidine‐2,4(1H,3H)‐diones with 1,3‐Diketones.
Authors: Tsupak E. B. , Shevchenko M. A. , Pozharskii A. F. , Tkachenko Yu. N.
Published: April 2004

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Synthesis and Bridgehead Reactions of 9‐Substituted 5,6,7,8,9,10‐Hexahydro‐5,9‐methanopyrimido[4,5‐b]azocin‐4(3H)‐ones.
Authors: Taylor Edward C. , Bhatia Beena
Published: April 2004

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Simple Synthesis of 1,2‐Dihydro‐5,6‐tri(tetra)methylenespiro(cyclopentane (cyclohexane)‐2‐thieno‐[2,3‐d]pyrimidine‐4(3H)‐thiones).
Authors: Dyachenko V. D.
Published: April 2004

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Cycloaddition of 4,6‐Dimethylpyrimidine‐2‐sulfenyl Chloride at the Acetylene Bond.
Authors: Borisov A. V. , Borisova G. N. , Nikonova Yu. A. , Osmanov V. K. , Matsulevich Zh. V.
Published: April 2004

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Adenine Derived Inhibitors of the Molecular Chaperone HSP90—SAR Explained Through Multiple X‐Ray Structures.
Authors: Dymock Brian , et al. et al.
Published: April 2004

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Synthesis of Novel Melanocortin 4 Receptor Agonists and Antagonists Containing a Succinamide Core.
Authors: Xi Ning , Hale Clarence , Kelly Michael G. , Norman Mark H. , Stec Markian , Xu Shimin , Baumgartner James W. , Fotsch Christopher
Published: April 2004

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A Novel Series of Potent and Selective IKK2 Inhibitors.
Authors: Bingham Alistair H. , Davenport Richard J. , Gowers Lewis , Knight Roland L. , Lowe Christopher , Owen David A. , Parry David M. , Pitt Will R.
Published: April 2004

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Dipyrrolo[1,2‐a;2′,1′‐c]pyrazines. Part 6. Electrophilic Substitution in a Series of Dipyrrolo[1,2‐a;2′,1′‐c]pyrazine and 5,6‐Dihydrodipyrrolo[1,2‐a;2′,1′‐c]pyrazine Derivatives. Phosphorylation of Dipyrrolo[1,2‐a;2′,1′‐c]pyrazines.
Authors: Terenin V. I. , Sumtsova E. A. , Vatsadze S. Z. , Kabanova E. V. , Leshcheva I. F. , Pleshkova A. P. , Zyk N. V.
Published: April 2004

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Syntheses of 1‐Allyl‐6‐(arylamino)methyl‐7‐methyl‐3‐phenylpteridine‐2,4‐dione, a Methanopterin Analogue.
Authors: Tada Masaru , Wada Momoko
Published: April 2004

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Synthesis and Properties of 1,3‐Diaryl‐5,6‐dihydro‐8H‐imidazo[2,1‐c]‐1,4‐oxazinium Bromides.
Authors: Demchenko A. M. , Shtil N. A. , Andrushko A. P. , Krasovsky A. N. , Chernega A. N. , Rusanov E. B. , Pirozhenko V. V. , Lozinskii M. O.
Published: April 2004

For Abstract see ChemInform Abstract in Full Text.
Trisubstituted 1,3,5‐Triazines. Part 6. Synthesis of 2,4,6‐Tris(acetonyl)‐1,3,5‐triazine.
Authors: Shastin A. V. , Godovikova T. I. , Korsunskii B. L.
Published: April 2004

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1‐Azakenpaullone Is a Selective Inhibitor of Glycogen Synthase Kinase‐3β.
Authors: Kunick Conrad , Lauenroth Kathrin , Leost Maryse , Meijer Laurent , Lemcke Thomas
Published: April 2004

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A Novel, Tandem Construction of C—N and C—C Bonds: Facile and One‐Pot Transformation of the Baylis—Hillman Adducts into 2‐Benzazepines.
Authors: Basavaiah Deevi , Satyanarayana Tummanapalli
Published: April 2004

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Reactions of N‐(2‐Chloroacetyl)‐α‐amino Acids with 3‐Cyanopyridine‐2(1H)‐thiones. New Promising Route to 3,4‐Dihydropyrido[3′,2′:4,5]thieno[3,2‐e][1,4]diazepine‐2(1H),5‐diones.
Authors: Fedorov A. E. , Shestopalov A. M. , Belyakov P. A.
Published: April 2004

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Novel Synthesis of Azocine, Azepine, Oxocine, and Oxepine Derivatives by Palladium‐Catalyzed Medium‐Ring Formation from Bromoallenes.
Authors: Ohno Hiroaki , Hamaguchi Hisao , Ohata Miyo , Kosaka Shohei , Tanaka Tetsuaki
Published: April 2004

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Synthesis of New Chiral Diaza 18‐Crown‐6 Ethers from Chiral Amines.
Authors: Demirel N. , Turgut Y. , Hosgoeren H.
Published: April 2004

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Saligenin Derivative Borocryptands: Synthesis and Structural Analysis of New Type Lithium Borocryptate.
Authors: Togrul M. , Suenkuer M. , Kaynak F. B. , Hosgoeren H. , Oezbey S.
Published: April 2004

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Immobilized Cobalt/Rhodium Heterobimetallic Nanoparticle‐Catalyzed Silylcarbocyclization and Carbonylative Silylcarbocyclization of 1,6‐Enynes.
Authors: Park Kang Hyun , Jung Il Gu , Kim So Yeon , Chung Young Keun
Published: April 2004

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Endo—Endo Mode lntramolecular Reductive Cyclization of Cyclic 1,2‐Bis(silylethynyl)benzenes.
Authors: Yamaguchi Shigehiro , Miyasato Masataka , Tamao Kohei
Published: April 2004

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A Novel and Convenient Synthetic Route to a 9‐Phosphatriptycene and Systematic Comparisons of 9‐Phosphatriptycene Derivatives.
Authors: Kobayashi Junji , Agou Tomohiro , Kawashima Takayuki
Published: April 2004

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Reaction of β‐Nitro‐ and β‐Halo‐β‐nitroethenylphosphonates with Furan.
Authors: Kuzhaeva A. A. , Anisimova N. A. , Deiko L. I. , Berkova G. A. , Berestovitskaya V. M.
Published: April 2004

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Synthesis of Difluoromethyl Substituted Iysophosphatidic Acid Analogues.
Authors: Xu Yong , Qian Lian , Pontsler Aaron V. , McIntyre Thomas M. , Prestwich Glenn D.
Published: April 2004

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Synthesis and Biological Evaluation of Ebselen and Its Acyclic Derivatives.
Authors: Chang Tsu‐Chung , Huang Mei‐Lan , Hsu Wen‐Lin , Hwang Jing‐Min , Hsu Ling‐Yih
Published: April 2004

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Synthesis of 5‐R‐Benzyl‐2‐iminoselenazolidin‐4‐ones.
Authors: Matiichuk V. S. , Obushak N. D. , Tsyalkovskii V. M.
Published: April 2004

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Selenium‐Containing Heterocycles from Isoselenocyanates: Synthesis of 2‐Arylaminoselenazolo[5,4‐b]pyridines.
Authors: Atanassov Plamen K. , Linden Anthony , Heimgartner Heinz
Published: April 2004

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Novel Approach Toward the Preparation of 1,6‐Enynes — Substrates for the Intramolecular Pauson—Khand Cyclization.
Authors: Smit W. A. , Tumanov V. V. , Zatonsky G. V.
Published: April 2004

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Preparation of 10‐Trifluoromethyl Artemether and Artesunate. Influence of Hexafluoropropan‐2‐ol on Substitution Reaction.
Authors: Magueur Guillaume , Crousse Benoit , Ourevitch Michele , Begue Jean‐Pierre , Bonnet‐Delpon Daniele
Published: April 2004

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A New Route to Furanoeremophilane Sesquiterpenoids. Synthesis of (.+‐.)‐6β‐Hydroxyeuryopsin.
Authors: Shanmugham M. Sundaram , White James D.
Published: April 2004

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Hexafluoroacetone as Protecting and Activating Reagent: An Efficient Strategy for Activation of Pyroglutamic Acid and Homologues.
Authors: Pumpor Ksenia , Boettcher Christoph , Fehn Susanna , Burger Klaus
Published: April 2004

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Substituted 1,2‐Thiazetidine 1,1‐Dioxides. Synthesis and Properties of N‐Alkylated and N‐Acylated Derivatives of 1,2‐Thiazetidine‐3‐acetic Acid 1,1‐Dioxide.
Authors: Roehrich Till , Thaher Bassam Abu , Otto Hans‐Hartwig
Published: April 2004

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Synthesis of Galactopyranosyl Amino Alcohols as a New Class of Antitubercular and Antifungal Agents.
Authors: Tripathi R. P. , et al. et al.
Published: April 2004

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A New Bismuth Nitrate‐Induced Stereospecific Glycosylation of Alcohols.
Authors: Banik Bimal K. , Adler Dorothy , Nguyen Phuong , Srivastava Neeta
Published: April 2004

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Asymmetric Synthesis of (‐)‐Indolizidine 209D via B‐Alkyl Suzuki Coupling and Amination Reactions.
Authors: Kim Guncheol , Shim Jae Hak , Kim Jin Hee
Published: April 2004

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Acremonidins, New Polyketide‐Derived Antibiotics Produced by Acremonium sp., LL‐Cyan 416.
Authors: He Haiyin , Bigelis Ramunas , Solum Eric H. , Greenstein Michael , Carter Guy T.
Published: April 2004

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Bhimamycin A≈E and Bhimanone: Isolation, Structure Elucidation and Biological Activity of Novel Quinone Antibiotics from a Terrestrial Streptomycete.
Authors: Fotso Serge , Maskey Rajendra P. , Gruen‐Wollny Iris , Schulz Klaus‐Peter , Munk Morton , Laatsch Hartmut
Published: April 2004

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First Synthesis of an Amythiamicin Pyridine Cluster.
Authors: Bagley Mark C. , Dale James W. , Jenkins Robert L. , Bower Justin
Published: April 2004

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Total Synthesis of (+)‐Isoschizandrin Utilizing a Samarium(II) Iodide Promoted 8‐Endo Ketyl—Olefin Cyclization.
Authors: Molander Gary A. , George Kelly M. , Monovich Lauren G.
Published: April 2004

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EI‐2128‐1, a Novel Interleukin‐1β Converting Enzyme Inhibitor Produced by Penicillium sp. E‐2128.
Authors: Koizumi Fumito , Agatsuma Tsutomu , Ando Katsuhiko , Kondo Hidemasa , Saitoh Yutaka , Matsuda Yuzuru , Nakanishi Satoshi
Published: April 2004

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R176502, a New Bafilolide Metabolite with Potent Antiproliferative Activity from a Novel Micromonospora Species.
Authors: Laakso Jodi A. , Mocek Ursula M. , Van Dun Jacky , Wouters Walter , Janicot Michel
Published: April 2004

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New Quinones and Hydroquinones from Malbranchea cinnamomea HKI 286 and HKI 296 and Interaction with Tax/CREB Expression System in Yeast.
Authors: Schlegel Brigitte , Haenel Frank , Gollmick Friedrich A. , Saluz Hans‐Peter , Graefe Udo
Published: April 2004

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Synthesis and Pharmacological Evaluation of Prenylated and Benzylated Pterocarpans Against Snake Venom.
Authors: da Silva Alcides J. M. , Coelho Antonio L. , Simas Alessandro B. C. , Moraes Raphael A. M. , Pinheiro Diogo A. , Fernandes Fabricio F. A. , Arruda Emerson Z. , Costa Paulo R. R. , Melo Paulo A.
Published: April 2004

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MOCVD Growth, Micro‐Structural, and Superconducting Properties of a‐Axis Oriented TlBaCaCuO Thin Films.
Authors: Malandrino Graziella , Perdicaro Laura M. S. , Fragala Ignazio L. , Testa Alberto M. , Fiorani Dino
Published: April 2004

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Parallel Synthesis and Characterization of Photoelectrochemically and Electrochemically Active Tungsten—Molybdenum Oxides.
Authors: Baeck Sung‐Hyeon , Jaramillo Thomas F. , Jeong Dae Hong , McFarland Eric W.
Published: April 2004

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Low‐Temperature Catalytic Growth of β‐Ga2O3 Nanowires Using Single Organometallic Precursor.
Authors: Chang Ko‐Wei , Wu Jih‐Jen
Published: April 2004

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Electrochemical Fabrication of Large‐Area, Ordered Bi2Te3 Nanowire Arrays.
Authors: Jin Chuangui , Xiang Xiaoqiang , Jia Chong , Liu Weifeng , Cai Weili , Yao Lianzeng , Li Xiaoguang
Published: April 2004

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Large‐Scale Synthesis of High‐Quality Double‐Walled Carbon Nanotubes by Catalytic Decomposition of n‐Hexane.
Authors: Lyu Seung Chul , Liu Bao Chun , Lee Su Hwan , Park Chong Yun , Kang Hee Kwang , Yang Cheol‐Woong , Lee Cheol Jin
Published: April 2004

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Design and Synthesis of Aminopropyl Tetrahydroindole‐Based Indolin‐2‐ones as Selective and Potent Inhibitors of Src and Yes Tyrosine Kinase.
Authors: Guan Huiping , Laird A. Douglas , Blake Robert A. , Tang Cho , Liang Chris
Published: April 2004

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Structure—Activity Relationships of Novel Potent MurF Inhibitors.
Authors: Gu Yu Gui , et al. et al.
Published: April 2004

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Aluminum and Gallium Hydrazides
Authors: Uhl Werner
Published: April 2004

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Stabilization of Molecular LiF, LiFHF, and Na2SiF6 Using Metallamacrocyclic Hosts
Authors: Lehaire Marie‐Line , Severin Kay
Published: April 2004

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Iron Oxide Chemistry. From Molecular Clusters to Extended Solid Networks
Authors: Jolivet Jean‐Pierre , Chaneac Corinne , Tronc Elisabeth
Published: April 2004

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Novel Compounds of Elements of Group 14: Ligand‐Stabilized Clusters with “Naked” Atoms
Authors: Schnepf Andreas
Published: April 2004

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The Way into the Bridge: A New Bonding Mode of Tertiary Phosphanes, Arsanes, and Stibanes.
Authors: Werner Helmut
Published: April 2004

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Synthetic and Mechanistic Pathways in Platinum(II) Chemistry
Authors: Romeo R. , Scolaro L. Monsu
Published: April 2004

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Interionic and Intermolecular Solution Structure of Transition Metal Complexes by NMR
Authors: Macchioni A.
Published: April 2004

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Results and Perspectives of High Oxidation State Organomolybdenum Chemistry in Water
Authors: Collange Edmond , Demirhan Funda , Gun Jenny , Lev Ovadia , Modestov Alexandre , Poli Rinaldo , Richard Philippe , Saurenz Dirk
Published: April 2004

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Arylcyclopropanes in the Synthesis of Nitrogen‐ and Oxygen‐Containing Heterocycles
Authors: Mochalov S. S. , Gazzaeva R. A.
Published: April 2004

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Stable, Self‐Assembling, Equilibrating Catalysts for Green Chemistry
Authors: Hill Craig L.
Published: April 2004

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Photochemical Reactions of α‐Halocyclic Ketones and Related Systems
Authors: Horiuchi C. Akira , Ji Shun‐Jun
Published: April 2004

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Cyclization of Stilbene and Its Derivatives
Authors: Gilbert Andrew
Published: April 2004

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Photochemistry of Heteroarene‐fused Barrelenes
Authors: Liao Chun‐Chen , Peddinti Rama Krishna
Published: April 2004

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Photochemically Induced Alkylation Reactions
Authors: Huther Nathalie , Parsons Andrew F.
Published: April 2004

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Photobehavior of Alkyl Halides
Authors: Kropp Paul J.
Published: April 2004

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Enantioselective Synthesis of Oxygen‐, Nitrogen‐ and Halogen‐Substituted Quaternary Carbon Centers
Authors: Ramon Diego J. , Yus Miguel
Published: April 2004

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Study on the Fluorine‐Containing Reactive Intermediates and Their Application in the Organic Synthesis
Authors: Zhu S. Z. , He P.
Published: April 2004

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Ionic Liquids from Biorenewable Resources: Nicotine and Fructose
Authors: Handy Scott T. , Okello Maurice , Egrie Christina , Dickenson Gary
Published: April 2004

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New Reactions of 1‐Alkynes Catalyzed by Transition Metal Complexes
Authors: Wakatsuki Yasuo , Hou Zhaomin , Tokunaga Makoto
Published: April 2004

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Heliannanes:A Structure—Activity Relationship Study
Authors: Macias F. A. , Molinillo J. M. G. , Chinchilla D. , Galindo J. C. G.
Published: April 2004

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Recent Developments in the Synthesis of Acetylcholinesterase Inhibitors
Authors: Marco Jose L. , Carreiras M. Carmo
Published: April 2004

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Natural Product‐Like Combinatorial Libraries
Authors: Abreu Pedro M. , Branco Paula S.
Published: April 2004

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Supramolecular Cluster Catalysis: A Case Study of Benzene Hydrogenation
Authors: Therrien Bruno , Vieille‐Petit Ludovic , Tschan Mathieu , Romakh Vladimir B. , Suess‐Fink Georg
Published: April 2004

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Fulgides and Related Systems
Authors: Yokoyama Yasushi , Kose Mahmut
Published: April 2004

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Photoinduced Electron‐Transfer Processes of Phthalimides
Authors: Oelgemoeller Michael , Griesbeck Axel G.
Published: April 2004

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Photochemical Rearrangement and Trapping Reactions of 4‐Pyrones
Authors: West Frederick G.
Published: April 2004

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Photochemically Induced Tautomerism of Salicylic Acid and Its Related Derivatives
Authors: Yoon Minjoong
Published: April 2004

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The Photochemistry of Esters of Carboxylic Acids
Authors: Pincock James A.
Published: April 2004

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Induced Diastereoselectivity in Photodecarboxylation Reactions
Authors: Pitchumani K. , Madhavan D.
Published: April 2004

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Recommended Critical Temperatures. Part 1. Aliphatic Hydrocarbons
Authors: Owczarek Iwona , Blazej Krystyna
Published: April 2004

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G‐Quartets 40 Years Later: From 5′‐GMP to Molecular Biology and Supramolecular Chemistry
Authors: Davis Jeffery T.
Published: April 2004

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Layer‐by‐Layer Deposition of Polyelectrolytes — A Versatile Tool for the in vivo Repair of Blood Vessels.
Authors: Groth Thomas , Lendlein Andreas
Published: April 2004

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IgE‐Independent Activation of Human Mast Cells Indicates Their Role in the Late Phase Reaction of Allergic Inflammation
Authors: Munitz A. , Piliponsky A. M. , Levi‐Schaffer F.
Published: April 2004

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Chemical Substances and Contact Allergy‐244 Substances Ranked According to Allergenic Potency
Authors: Schlede E. , Aberer W. , Fuchs T. , Gerner I. , Lessmann H. , Maurer T. , Rossbacher R. , Stropp G. , Wagner E. , Kayser D.
Published: April 2004

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Application of Evolutionary Algorithms to Combinatorial Library Design
Authors: Gillet Valerie J.
Published: April 2004

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Chemical Insights from EPR Spectra of Organometallic Radicals and Radical Ions
Authors: Rieger Anne L. , Rieger Philip H.
Published: April 2004

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Reactions of Polypeptide Ions with Electrons in the Gas Phase
Authors: Zubarev Roman A.
Published: April 2004

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Dimensionally Oriented Redox‐Active π‐Conjugated Systems
Authors: Hirao Toshikazu , Saito Kaori
Published: April 2004

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In situ Synthesis and Characterization of Fullerene Derivatives by Knudsen‐Cell Mass Spectrometry
Authors: Boltalina Olga V. , Goryunkov Alexey A. , Markov Vitaly Yu. , Ioffe Ilya N. , Sidorov Lev N.
Published: April 2004

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A surrogate marker profile for PML/RARα expressing acute promyelocytic leukemia and the association of immunophenotypic markers with morphologic and molecular subtypes
Authors: Paietta E. , Goloubeva O. , Neuberg D. , Bennett J. M. , Gallagher R. , Racevskis J. , Dewald G. , Wiernik P. H. , Tallman M. S.
Published: April 2004

Background

The availability of genotype‐specific therapy for PML/RARαpos acute promyelocytic leukemia (APL) requires that this disease be precisely diagnosed. Immunophenotypic characteristics heretofore proclaimed as reliably characterizing APL (HLA‐DRlow, CD34low, P‐glycoproteinlow myeloid phenotype) do not differentiate from APL‐like immune profiles unassociated with the PML/RARα fusion transcript.

Methods

To establish a surrogate marker profile for APL, we explored 19 potentially predictive markers compared with differentiated acute myeloid leukemia using the classification tree approach with recursive partitioning.

Results

In a test group of 58 APL patients, the most predictive immune profile was HLA‐DRlow, CD11alow (αL subunit of the leukocyte integrin LFA‐1), CD18low (β2 subunit of LFA‐1). APL cells always expressed CD117 (c‐kit) but lacked the progenitor antigen CD133 and the more mature myeloid antigen, CD11b (αM leukocyte integrin). This antigen pattern was validated in 90 additional APL patients. M3v APLs (n = 30) had more leukemic promyelocytes expressing the T‐cell antigen, CD2 (P < 0.0001) or the stem cell marker, CD34 (P = 0.0003) and demonstrated higher fluorescence intensity for the binding of antibody to the common leukocyte antigen, CD45 (P = 0.0008) than M3 (n = 102). S‐form APL (n = 45) had a higher percent of cells expressing CD2 or CD34 (P < 0.0001 for both) or the neural cell adhesion molecule CD56 (P = 0.001) than L‐form APL (n = 66).

Conclusions

PML/RARαpos APL cells typically lack leukocyte integrins. HLA‐DRlow, CD11alow, CD18low is a reliable surrogate antigen expression profile for PML/RARαpos APL, irrespective of morphology and transcript isoform. © 2004 Wiley‐Liss, Inc.
A flow cytometric assay for simultaneous assessment of drug efflux, proliferation, and apoptosis
Authors: Barbier M. , Gray B. D. , Muirhead K. A. , Ronot X. , Boutonnat J.
Published: April 2004

Background

Proliferative status and multidrug resistance play a key role in determining cell response to chemotherapy. There is a need to develop multiple labeling method that allows simultaneous assessment of multidrug resistant (MDR) phenotype, proliferative status, apoptosis related changes in mitochondrial potential, in chemosensitive and chemoresistant tumor cell populations.

Methods

A three‐color labeling was performed using Hoechst 33342 (DNA), JC1 (mitochondrial potential), and a far red fluorescent membrane intercalating dye: PTIR271 (proliferation).

Results

Combined staining of DNA and mitochondrial potential allows identification of subpopulations expressing and MDR phenotype mediated by P‐glycoprotein (Pgp), and, in Pgp negative subpopulations, identification of apoptotic cells and evaluation of cell cycle status in viable cells. Addition of a far red fluorescent membrane intercalating dye, PTIR271, allows simultaneous monitoring of cell division status by dye dilution in both drug sensitive and drug resistant populations.

Conclusion

This triple labeling is an interesting method to study the proliferation status of drug sensitivity and drug resistance in viable tumor cells. © 2004 Wiley‐Liss, Inc.
The Reaction of μ‐η2:η2‐Peroxo‐ and Bis(μ‐oxo)dicopper Complexes with Flavonol
Authors: Kaizer József , Pap József , Speier Gábor , Párkányi László
Published: April 2004

The [Cu2(μ‐O)2]2+ and [Cu2(μ‐η2:η2‐O)2]2+ motifs with coordinated N,N,N‐tribenzyl‐1,4,7‐triazacyclononane and N,N,N‐triisopropyl‐1,4,7‐triazacyclononane auxiliary ligands in their reaction with flavonol do not lead to ring scission products of the heterocycle, but the formation of the corresponding (flavonolato)copper(II) complexes [Cu(fla)(Bz‐TAC)]ClO4 and [Cu(fla)(iPr‐TAC)]ClO4. The subsequent oxygenolysis of the coordinated flavonolate ligand leads to O‐benzoylsalicylate at elevated temperature, resulting in the enzyme mimicking products [Cu(O‐bs)(Bz‐TAC)]ClO4, [Cu(O‐bs)(iPr‐TAC)]ClO4) as well as carbon monoxide. The X‐ray structures of [Cu(fla)(Bz‐TAC)]ClO4, [Cu(O‐bs)(Bz‐TAC)]ClO4, and [Cu(O‐bs)(iPr‐TAC)]ClO4) are presented. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Supramolecular Structures in [Ag(dppf)] Complexes [dppf = 1,1′‐Bis(diphenylphosphanyl)ferrocene] Stabilized by Coordinatively Versatile Trifluoroacetate (TFA) Ligands
Authors: Lu Xiu Lian , Leong Weng Kee , Goh Lai Yoong , Hor Andy T. S.
Published: April 2004

The interaction of silver(I) trifluoroacetate and dppf in different molar equivalents has led to the isolation of dinuclear complexes [Ag2(μ‐O2CCF3)2(μ‐dppf)] (1) and [Ag2(η1‐O2CCF3)2(dppf)2] (2). Treatment of 1 with excess dppf gave a coordination polymeric compound [Ag(η2‐O2CCF3)(dppf)]n (3). Reaction of 1 with PMe2Ph in MeOH in the presence of NH4PF6 led to displacement of trifluoroacetate, forming the mononuclear compound [Ag(PMe2Ph)2(η2‐dppf)]PF6 (4). All compounds have been characterized by microanalytical and spectroscopic analyses [IR, MS and NMR (1H, 19F and 31P{1H})] as well as X‐ray diffraction studies. Molecular structures of the solvates of 1, viz. 1A (1·0.5THF) and 1B (1·0.5CH2Cl2), 2 and 3 show that they contain trifluoroacetate in bridging, monodentate and bidentate bonding modes, respectively, with dppf as a bridging co‐ligand. Compound 3 is an infinite linear [−dppf−Ag−dppf−Ag−dppf−Ag−]n coordination polymer. Interestingly, 1A and 1B form two different supramolecular network structures through C−H···F and C−H···O hydrogen‐bonding interactions. Such secondary bonding interactions also lead to the formation of a 3D supramolecular structure in 3. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Complexation Properties of Ethylenediaminetetramethylenephosphonic Acid (EDTMP) with AlIII and VIVO
Authors: Di Marco Valerio , Kilyen Melinda , Jakusch Tamás , Forgó Péter , Dombi György , Kiss Tamás
Published: April 2004

The complexation properties (including stoichiometries and stability constants of the complexes formed) of ethylenediaminetetramethylenephosphonic acid with AlIII and VIVO were studied in aqueous solution at an ionic strength of 0.2 M KCl, at 25 °C by means of pH potentiometry. For AlIII both mononuclear (AlLHn) and dinuclear (Al2LHn) species were found in solution, whereas for VIVO only mononuclear complexes were detected. For each metal ion, a solid complex was isolated at acidic pH and was characterized stoichiometrically. 1H and 31P NMR (for AlIII), UV/Vis and EPR (for VIVO) spectra were used to confirm the potentiometric results and to suggest the most probable binding mode of the complexes formed in solution. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Dimeric 2,2′‐Bipyridylruthenium(II) Complexes Containing 2,2′‐Bis(1,2,4‐triazin‐3‐yl)‐4,4′‐bipyridine‐Like Bridging Ligands: Syntheses, Characterization and DNA Binding
Authors: Jiang Cai‐Wu
Published: April 2004

Three new bridging ligands 2,2′‐bis(1,2,4‐triazin‐3‐yl)‐4,4′‐bipyridine (btb), 2,2′‐bis(1,2,4‐triazino[5,6‐f]acenaphthylen‐3‐yl)‐4,4′‐bipyridine (btapb), 2,2′‐bis(5,6‐diphenyl‐1,2,4‐triazin‐3‐yl)‐4,4′‐bipyridine (bdptb) and their dimeric 2,2′‐bipyridylruthenium(II) complexes [Ru(bpy)2(btb)Ru(bpy)2]4+ (1), [Ru(bpy)2(btapb)Ru(bpy)2]4+ (2), [Ru(bpy)2(bdptb)Ru(bpy)2]4+ (3) have been synthesized and characterized by elemental analysis, fast atom bombardment (FAB) mass spectrometry or electrospray mass spectrometry (ES‐MS), 1H NMR and UV/Visible spectroscopy. The binding behavior of these dimeric complexes with calf thymus DNA (CT‐DNA) was investigated by electronic absorption spectroscopy, viscosity measurements, and equilibrium dialysis experiments. The hypochromism of the metal‐ligand charge transfer (MLCT) band in the electronic absorption spectra of the dinuclear complexes 1, 2, and 3 is 8.7%, 19% and 33%, respectively, with bathochromic shifts of 5, 5 and 14 nm, respectively. The binding constants are 7.5×104 M−1, 4.8×105 M−1 and 7.6×105 M−1, respectively. Increasing the size of the plane of the bridging ligand increases the hydrophobicity of their complexes, leading to stronger binding by the complexes to calf thymus DNA. The effect of increasing concentrations of these novel dimeric ruthenium(II) complexes on the relative viscosities of CT‐DNA is less notable than that of well‐known intercalators such as [Ru(bpy)2(dppz)]2+. The equilibrium experiments showed that ΛΛ−3 binding is stronger than ΔΔ−3 binding to CT‐DNA. This is the first example of a dinuclear complex binding enantioselectively to CT‐DNA measured by equilibrium dialysis. The experiments suggest that the three complexes may be DNA groove binders. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Synthesis and Characterisation of Novel Main Group Element Clusters with Tin‐Phosphorus, Tin‐Arsenic, and Germanium‐Phosphorus Skeletons
Authors: Nikolova Donna , von Hänisch Carsten , Adolf Ariane
Published: April 2004

The reaction of iPr3SiPLi2 with SnCl2 in the mol ratio 1:1 leads to the formation of [Sn7(PSiiPr3)7] (1). The cluster [Sn8(PSiiPr3)6Cl2] (3) is obtained, if the same reaction is carried out with a slight excess of the metal salt. Similar lithium chloride elimination reactions between SnCl2 and iPr3SiAsLi2 in the mol ratio 1:1 and 2:3, however, yield [Sn7(AsSiiPr3)7] (2) and [Sn4(AsSiiPr3)6Li4(Et2O)2] (4), respectively. The metal salt GeCl2(diox)2 (diox = 1,4‐dioxane) reacts with iPr3SiPLi2 to give [Ge6(PSiiPr3)6] (5). Compounds 1−5 were characterised by NMR and IR spectroscopic techniques as well as elemental analysis. The crystal structures were identified by X‐ray diffraction analysis, which confirmed that the heptameric skeletons of 1 and 2 are structurally analogous. The Sn/P cluster 3 contains subvalent tin atoms, while 4 forms a Sn4As6Li4 rhombododecahedron and 5 a slightly distorted hexagonal prism. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
First ICN Adduct with a Selenium Donor (R = Se): Is It an Ionic [RSeCN]+I− or a “T‐Shaped” R(I)SeCN Hypervalent Compound?
Authors: Aragoni M. Carla , Arca Massimiliano , Demartin Francesco , Devillanova Francesco A. , Garau Alessandra , Grimaldi Patrizio , Isaia Francesco , Lelj Francesco , Lippolis Vito , Verani Gaetano
Published: April 2004

The reaction between 1,3‐dimethyl‐4‐imidazoline‐2‐selone (2) and ICN gave the adduct 2·ICN, whose crystal structure features dimers made up of two [2·CN]+ and two I− which strongly interact. Hybrid DFT calculations on the adduct 2·ICN, on the cation [2·CN]+, and on the dimer (2·ICN)2 account for a partially hypervalent selenium atom in 2·ICN and for the observed structural features. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Bis[di‐n‐alkyl(fluoro)stannyl]methanes, (R2FSn)2CH2 (R = n‐octyl, n‐dodecyl): Stable Fluoride‐Selective Carriers
Authors: Chaniotakis Nikolas , Jurkschat Klaus , Müller Dirk , Perdikaki Katerina , Reeske Gregor
Published: April 2004

The synthesis of bis[di‐n‐alkyl(fluoro)stannyl]methanes, [(R2)FSn]2CH2, (3, R = n‐octyl; 4, R = n‐dodecyl), is reported and their unprecedented dimeric structure in solution with pentacoordinate tin atoms is rationalized on the basis of 19F and 119Sn NMR spectroscopy, osmometric molecular mass determination and electrospray mass spectrometry (ESMS). 19F and 119Sn MAS NMR and Mössbauer spectroscopy also indicate pentacoordinate tin atoms for the solid state. The ability of compounds 3 and 4 to bind fluoride ion selectively and reversibly is evaluated through potentiometric measurements. Compared with the previously reported organotin(IV)‐based fluoride ionophore [Cl(Ph2)Sn]2CH2, 3 and 4 exhibit a drastically improved lifetime, while retaining their high preference for fluoride over all other lipophilic anions evaluated. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
A Fulvene Route to Group 4 Metallocene Complexes Bearing 4,7‐Bis(dimethylamino)‐Substituted Indenyl Ligands
Authors: Sierra Jesus Cano , Kehr Sierra Gerald , Fröhlich Roland , Erker Gerhard
Published: April 2004

N,N,N′,N′‐Tetramethylsuccinamide (15) was selectively converted into the functionalized aminofulvene 16. Subsequent treatment with reagent 17, [ZrCl2(NMe2)2(L)2] (L = THF or 0.5 DME), resulted in the formation of the cyclization product 4,7‐bis(dimethylamino)indene (21). Deprotonation with n‐butyllithium, followed by the reaction of the resulting substituted indenyllithium reagent 22 with ZrCl4, gave the metallocene [4,7‐bis(dimethylamino)indenyl]2ZrCl2 (23). The reaction of 22 with ZrCl3Cp furnished the complex [4,7‐bis(dimethylamino)indenyl]CpZrCl2 (24). Fulvene 16, as well as the metallocene dichlorides 23 and 24, were characterized by X‐ray diffraction. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)