bluuebunny/crossref_metadata_2025 huggingface dataset:
Reactions of Silicon–Silicon Bonds, VI. Reductive Trichloroslilylation Reactions Leading to Alkyl‐ and Dialkylaminobis(trichlorosilyl)phosphanes
Authors: Müller Lutz‐Peter , Zanin Andreas , Du Mont Wolf‐Walther , Jeske Jörg , Martens Reiner , Jones Peter G.
Published: July 2007

Reactions of hexachlorodisilane and of trichlorosilane/triethylamine with alkyl‐and dialkylaminodichlorophosphanes RPCl2 1a–i [R = iPr: a; (Me3Si)2CH: b; R=1‐adamantly: c: R=tBu: d; R=Et2N: e; R=iPr2M: f] furnish bis(trichlorosilyl)‐phosphanes RP(SiCl3)2 3a–f. However, when less bulky substituents are attached to the phosphorus atom, so that there is little steric crowding, the double reductive silylations leading from 1 to 3 are accompanied by side reactions and decomposition of 3. Therefore, only 3b, 3c, 3d, and 3f wre isolated in a pure state. These compounds are more readily prepared by the; trichlorosilane/triethylamine method. 1H‐, 31P‐ and 29Si‐Nmr spectra confirm their constitution. The structure of solid 3f, the first aminobis(trichlorosilyl)phosphane, was determined by X‐ray crystallography. 3f contains a phosphorus atom in a pyramidal environment surrounded by two silicon atoms and a planar nitrogen atom of the diisopropylamino group.
“Potassium Potassates” Based on Dihydrotriazinide Ligands: Syntheses, Crystal Structures, and Comparison with Other Alkali Metal Dihydrotriazinide Compounds
Authors: Clegg William , Elsegood Mark R. J. , Horsburgh Lynne , Mulvey Robert E. , Ross Michael J.
Published: July 2007

A series of dihydro‐s‐triazinidopotassium complexes have been synthesised and structurally characterised by X‐ray diffraction. Two of them, the sesqui‐pyridine solvate 2 and the mono‐THF solvate 3, can be classified in formal terms as “potassium potassates” in conforming to the structural pattern established previously for the sesqui‐THF solvate 1, the first reported ate of this type. Formally complex [(R2K)−] anions are linked to K+ cations in polymeric, zig‐zag chain arrangements. Solvate 3 also possesses a unique RK coordination as a direct result of having fewer solvent ligands. DMSO analogue 4 deviates from this uniformity in adopting a centrosymmetric, dimeric (OK)2 ring structure featuring both terminal and bridging DMSO ligands. The dihydro‐s‐triazinidosodium tris(THF) solvate 5 is found to be a monomer. For comparative purposes, the metal‐free, parent triazine molecule 6 has also been subjected to an X‐ray crystallographic study: it displays a 1,2‐dihydro ring setup as opposed to the 1,4‐dihydro alternative existing in the metallo examples. Triazine 6 is also found to form a N–H…Br bridge in the dimeric structure of the lithium bromide bis (THF) solvate 7, a suspected hydrolysis product from the reaction of dihydro‐s‐triazinidolithium 8 and magnesium bromide bis(ether) adduct.
Models for Vanadate‐Dependent Haloperoxidases: Vanadium Complexes with O4N‐Donor Sets
Authors: Bashirpoor Mandana , Schmidt Hauke , Schulzke Carola , Rehder Dieter
Published: July 2007

Reaction of vanadyl sulfate with the Schiff base H2L1 derived from o‐vanillin and glycine leads to [VIVO(H2O)L1 (1), treatment of which with acetyl chloride affords cis‐[VIVCl2L1] (2). Reaction of [VO(acac)2] with the Schiff base H2L2 derived from o‐hydroxynaphthaldehyde and o‐hydroxyaniline under aerobic conditions yields [{VVO(L2)}2μ‐O] (3), which undergoes methanolysis in excess methanol to form [VVO(MeOH)(OMe)L2] (5a). Complex 5a is also obtained via [VVOCl(L2)] (4) and MeOH. On treatment of 3 with an equimolar amount of ethanol, [VVOCl(L2)] (4) and MeOH. On treatment of 3 with an equimolar amount of ethanol. [VVO(OEt)L2] (5b) is obtained. With the chiral tertiary bis(ethanol)amine (S)‐ or (R)‐(HOCH2CH2)2NCH(Ph)Me, H2L3, [VO(acac)2] loses only one acetylacetonate (1‐) ligand, and the complexes (S)‐ and (R)‐[VVO(acac)L3] (6a) are formed. As is evident for the corresponding reaction with (HOCH2CH2)2NPh, H2L4, which affords [VVO(acac)L4 (6b), the substitution is a second‐order process (rate constant 0.013 M−1 h−1). 5a…MeOH, 5b, (R)−6a, and (S)−6a have been structurally characterized by single crystal X‐ray diffraction analysis. The molecular connectivities have also been established for 1‐H2O. All of the structurally characterized complexes contain an O*O3N donor set (O* denotes a doubly‐bonded oxo group) and thus model the coordination environment of the active site in vanadate‐dependent haloperoxidases. This model character is particularly pronounced in 5b, the coordination geometry of which is half‐way to trigonal‐bipyramidal. 5a and 6a contain, in addition to the O*O3N set, a labile V‐O or V‐N bond, respectively, which may mimic substrate binding to the active centre. 6a is also of relevance to the enantioselective peroxide oxidation of sulfides to sulfoxides by catalyst systems containing vanadium and H2L3.
On the Oxenoid Character of Alkylperoxy Anions and Their Lithium Compounds: A Combined Mass‐Spectrometric and Theoretical Investigation
Authors: Schalley Christoph A. , Schröder Detlef , Schwarz Helmut , Möbus Konrad , Boche Gernot
Published: July 2007

A combined mass‐spectrometric and theoretical approach has been used for an investigation of the gas‐phase chemistry of two representative alkylperoxy anions. Metastable CH3OO− ions undergo unimolecular loss of molecular hydrogen and formaldehyde yielding HCO−2 and OH−, respectively. The observed reactivity is in pleasing agreement with calculations of the [C,H3,O2− and [C,H,O2]‐ potential‐energy surfaces at the BECKE3LYP/6‐311+ + G** level of theory. Upon exhaustive methylation of the α‐position as in t‐C4H9OO− anions, the reactivity switches completely to an elimination of (CH3)2CCH2 giving rise to the formation of HOO−. The results obtained for the “bare” alkylperoxy anions are used for the analysis of the EI mass spectrum of (t‐C4H9OOLi)12 dodecamers, which thermally decompose in the inlet system at a probe temperature of ca. 130°C. The decomposition is rationalized by a mechanism involving nucleophilic attack of one t‐C4H9OOLi subunit on the oxenoid oxygen atom of a second t‐C4H9OOOLi moiety. This reaction may produce t‐C4H9OOOLi trioxy species as intermediates, which rapidly decompose to singlet dioxygen and t‐C4H9OLi.
Complexes of Early Transition Metal Alkoxides: Molecular Structure of Ti(OiPr)4[OPb4(tBuN)3]
Authors: Papiernik Renée , Hubert‐Pfalzgrl Liliane G. , Veith Michael , Huch Volker
Published: July 2007

The reaction between Ti(OiPr)4 and [Pb(NtBu)2] (1) in refluxing THF afforded the complex Ti(OiPr)4OPb4(NtBu)3] (2) which has been characterized by X‐ray diffraction studies and by 1H‐ and 13C‐NMR spectroscopy. Titanium is five coordinate and it displays a trigonal bipyramidal stereochemistry with the pb4(tBuN)3O cage ligand bonded to titanium through the oxygen atom and occupying an apical position. The origin of the cubane lead ligand is discussed.
Increasing the Number of Oxygen Vacancies on TiO2 by Doping with Iron Increases the Activity of Supported Gold for CO Oxidation
Authors: Carrettin Silvio , Hao Yalin , Aguilar‐Guerrero Veronica , Gates Bruce C. , Trasobares Susana , Calvino Jose J. , Corma Avelino
Published: July 2007

The addition of iron to high‐area TiO2 (Degussa P25, a mixture of anatase and rutile) increases the number of oxygen defect sites that react with O2 to form peroxide and superoxide species. In the presence of gold nanoclusters on the TiO2 surface, the superoxide species become highly reactive, and the activity of the supported gold catalyst for CO oxidation is approximately twice that of the most active comparable catalysts described in the literature. Images of the catalyst obtained by scanning transmission electron microscopy combined with spectra of the catalyst measured in the working state (Raman, extended X‐ray absorption fine structure, and X‐ray absorption near‐edge structure) indicate strong interactions of gold with the support and the presence of iron near the interfaces between the gold clusters and the TiO2 support. The high activity of the catalysts is attributed to the presence of defects in these sites that activate oxygen.
Supported Bilayer Lipid Membrane Arrays on Photopatterned Self‐Assembled Monolayers
Authors: Han Xiaojun , Pradeep Singh N. D. , Critchley Kevin , Sheikh Khizar , Bushby Richard J. , Evans Stephen D.
Published: July 2007

This work demonstrates the use of photocleavable cholesterol derivatives to create supported bilayer lipid membrane arrays on silica. The photocleavable cholesteryl tether is attached to the surface by using the reaction of an amine‐functionalized self‐assembled monolayer (SAM) and the N‐hydroxysuccinimide‐based reagent 9. The resultant SAM contains an ortho‐nitrobenzyl residue that can be cleaved by photolysis by using soft (365 nm) UV light regenerating the original amine surface, and which can be patterned using a mask. The photoreaction yield was ≈75 % which was significantly higher than previously found for related ortho‐nitrobenzyl photochemistry on gold substrates. The SAMs were characterized by means of contact angle measurements, ellipsometry and X‐ray photoelectron spectroscopy. Patterned surfaces were characterized with SEM and AFM. After immersing the patterned surface into a solution containing small unilamellar vesicles of egg phosphatidylcholine (PC), supported lipid membranes were formed comprised of lipid bilayer over the amine functionalized “hydrophilic” regions and lipid monolayer over the cholesteryl “hydrophobic” regions. This was confirmed by fluorescence microscopy and AFM. FRAP studies yielded a lateral diffusion coefficient for the probe molecule of 0.14±0.05 μm2 s−1 in the bilayer regions and ≈0.01 μm2 s−1 in the monolayer regions. This order of magnitude difference in diffusion coefficients effectively serves to isolate the bilayer regions from one another, thus creating a bilayer array.
Structure and Properties of α‐ and β‐CeCuSn: A Single Crystal and Moessbauer Spectroscopic Investigation.
Authors: Sebastian C. Peter , Rayaprol Sudhindra , Hoffmann Rolf‐Dieter , Rodewald Ute Ch. , Pape Tania , Poettgen Rainer
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Solid‐State 129Xe and 131Xe NMR Study of the Perxenate Anion XeO4‐6.
Authors: Forgeron Michelle A. M. , Wasylishen Roderick E. , Gerken Michael , Schrobilgen Gary J.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Structural, Magnetic and Transport Properties of Mn3.1Sn0.9 and Mn3.1Sn0.9N Compounds.
Authors: Feng W. J. , Li D. , Ren W. J. , Li Y. B. , Li W. F. , Li J. , Zhang Y. Q. , Zhang Z. D.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Density Functional Theory and ab initio Study of Electronic and Electrochemistry Properties of the Tetranuclear Sandwich Complex [FeIII4(H2O)2 (PW9O34)2]6‐.
Authors: Romo Susanna , Fernandez Jorge A. , Maestre Joan Miquel , Keita Bineta , Nadjo Louis , de Graaf Coen , Poblet Josep M.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ln2+xI2M2+y (Ln: Ce, Gd, Y; M: Al, Ga): Reduced Rare Earth Halides with a Hexagonal Metal Atom Network.
Authors: Lukachuk Mar'yana , Zheng Chong , Mattausch Hansjuergen , Banks Michael G. , Kremer Reinhard K. , Simon Arndt
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Expanding the Crystal Chemistry of Uranyl Peroxides: Synthesis and Structures of Di‐ and Triperoxodioxouranium(VI) Complexes.
Authors: Kubatko Karrie‐Ann , Forbes Tori Z. , Klingensmith Amanda L. , Burns Peter C.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis and Study of the Crystallographic and Magnetic Structure of HoFeMnO5.
Authors: Munoz Angel , Alonso Jose A. , Martinez‐Lope Maria J. , Martinez Jose L.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ba2Co9O14: New Inorganic Building Blocks with Magnetic Ordering Through Super‐Super Exchanges Only.
Authors: Ehora Ghislaine , Daviero‐Minaud Sylvie , Colmont Marie , Andre Gilles , Mentre Olivier
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
NOBIN‐Prolinamide Organocatalyzed Enantioselective Direct Aldol Reaction: Remarkable Activity in Apolar Medium.
Authors: Russo Alessio , Botta Giovanna , Lattanzi Alessandra
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Dynamic Kinetic Resolution of Primary Amines with a Recyclable Pd Nanocatalyst for Racemization.
Authors: Kim Mahn‐Joo , Kim Won‐Hee , Han Kiwon , Choi Yoon Kyung , Park Jaiwook
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
First Hypervalent Iodine(III)‐Catalyzed C—N Bond Forming Reaction: Catalytic Spirocyclization of Amides to N‐Fused Spirolactams.
Authors: Dohi Toshifumi , Maruyama Akinobu , Minamitsuji Yutaka , Takenaga Naoko , Kita Yasuyuki
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Reductive N‐Alkylation of Aromatic Amines and Nitro Compounds with Nitriles Using Polymethylhydrosiloxane.
Authors: Reddy Ch. Raji , Vijeender K. , Bhusan P. Bibhuti , Madhavi P. Phani , Chandrasekhar S.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Direct‐Type Catalytic Mannich Reactions of Amides with Imines.
Authors: Saito Susumu , Tsubogo Tetsu , Kobayashi Shu
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Highly Enantioselective Water‐Compatible Organocatalyst for Michael Reaction of Ketones to Nitroolefins.
Authors: Vishnumaya Vishnumaya , Singh Vinod K.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Asymmetric Addition of Alkynes to Imines in Water Catalyzed with a Recyclable Cu(I)—Bis(oxazoline) and Stearic Acid System.
Authors: Liu Juntao , Liu Bao , Jia Xian , Li Xingshu , Chan Albert S. C.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Base‐Catalyzed Mitsunobu Reactions as a Tool for the Synthesis of Aryl sec‐Alkyl Ethers.
Authors: Manivel Pitchai , Rai Neithnadka Premsai , Jayashankara Vaderapura Puttaramegowda , Arunachalam Pirama Nayagam
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Imidazolium‐Based Framework: Imidazolium Salt—Oxazoline/Palladium(II) Acetate in situ Catalyst Systems.
Authors: Alcalde Ermitas , Dinares Immaculada , Mesquida Neus , Rodriguez Sandra
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Novel One‐Pot Iridium‐Catalyzed Alder—Ene—Murahashi Sequence.
Authors: Kummeter Manuela , Ruff Christian M. , Mueller Thomas J. J.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Photochemically Catalyzed Ring Opening of Oxiranecarbonitriles and [3 + 2] Cycloaddition with Olefins: Synthesis of Polysubstituted Tetrahydrofurans.
Authors: Pan Jinhui , Zhang Wei , Zhang Jie , Lu Shenci
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of 5‐Substituted 4,5,6,7‐Tetrahydroindoles from Cyclohexanones.
Authors: Lee Chang Kiu , Lee In‐Sook Han , Noland Wayland E.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
New Functionalized Pyrazolines from 1‐Aroyl‐2‐phenylacetylenes and Thiocarbonohydrazides.
Authors: Dvorko M. Yu. , Albanov A. I. , Chipanina N. N. , Sherstyannikova L. V. , Samoilov V. G. , Komarova T. N. , Glotova T. E.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Microwave‐Assisted Dehydrosulfuration: An Efficient, Solvent‐Free Synthesis of 5‐(1‐Adamantyl)‐2‐arylamino‐1,2,4‐triazolo[3,4‐b][1,3,4]thiadiazoles.
Authors: Al‐Abdullah Ebtehal S. , Shehata Ihsan A. , Al‐Deeb Omar A. , El‐Emam Ali A.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Diastereoselective Synthesis of Chiral Methyl 2‐Piperidin‐2‐ylpropanoates.
Authors: Pereira Jennifer , Calvet‐Vitale Sandrine , Fargeau‐Bellassoued Marie‐Claude , Mouries‐Mansuy Virginie , Vanucci‐Bacque Corinne , Lhommet Gerard
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Non‐Catalytic Approach to the Synthesis of 5,6‐Dihydrobenzo[h]quinolines.
Authors: Pratap Ramendra , Ram Vishnu Ji
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Furano[3,2‐c]‐ and Pyrano[3,2‐c]quinolines upon Imino Diels—Alder Reactions Initiated by Nitrosonium (NO+).
Authors: Zhou Yu‐Lu , Jia Xiao‐Dong , Li Rui , Han Bing , Wu Long‐Min
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Isoindolo[1′,2′:2,3]pyrido[3′′,2′′:4′,5′]thieno[3′,2′:4,5]pyrimido [1,6‐a]benzimidazol‐8(12bH)‐one. A Novel Polycondensed Heterocyclic System
Authors: Makhmud Mokhamed Abdel‐Moneim , Vasilin V. K. , Krapivin G. D.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Sodium Hydride Mediated Cascade Reaction Towards the Synthesis of 1,5‐Disubstituted Uracil from Cyanamides Derived from Baylis—Hillman Adducts.
Authors: Nag S. , Yadav G. P. , Maulik P. R. , Batra S.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
An Orthogonal Protection Strategy for the Synthesis of 2‐Substituted Piperazines.
Authors: Clark Roger B. , Elbaum Daniel
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Simple and Environmentally Benign Method for the Synthesis of Naphthoxazin‐3‐one Derivatives.
Authors: Dabiri Minoo , Delbari Akram Sadat , Bazgir Ayoob
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Heterocycles [h]Fused on 4‐Oxoquinoline‐3‐carboxylic Acid. Part 2. A Facile Synthesis of Some 2,7‐Dioxo[1,4]thiazin[2,3‐h]quinoline‐8‐carboxylic Acids.
Authors: Al‐Huniti Mohammed H. , Zahra Jalal A. , El‐Abadelah Mustafa M.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis and anti‐HIV Activity of 4‐Chloro‐2‐mercapto‐N‐ (1,4,5,6‐tetrahydro‐1,2,4‐triazin‐3‐yl)benzenesulfonamide Derivatives.
Authors: Pomarnacka E.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Enantioselective Synthesis of Aminobenzazepinones.
Authors: Prasad C. V. C. , Mercer Stepen E. , Dubowchik Gene M. , Macor John E.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Novel Ligand‐Free, Cobalt‐Catalyzed [2 + 2 + 2] Cycloadditions: Syntheses of 1,4‐Disilatetralins and 1,3‐Disilaindans.
Authors: Doszczak Leszek , Fey Philipp , Tacke Reinhold
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ti(O‐iPr)4‐Catalyzed Hydrophosphonylation of Activated Alkenes by Diphenyl H‐Phosphonate.
Authors: Yao Qiang
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Structures of New Cucurbitane‐Type Triterpenes and Glycosides, Karavilagenins D and E, and Karavilosides VI, VII, VIII, IX, X, and XI, from the Fruit of Momordica charantia.
Authors: Matsuda Hisashi , Nakamura Seikou , Murakami Toshiyuki , Yoshikawa Masayuki
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis and Biological Evaluation of New Taxoids Derived from 2‐Deacetoxytaxinine J.
Authors: Botta Maurizio , Armaroli Silvia , Castagnolo Daniele , Fontana Gabriele , Pera Paula , Bombardelli Ezio
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthetic Approach to exo‐Glycals from 1‐C‐Vinyl‐D‐glycopyranose Derivatives via an SN1′‐Substitution Mechanism.
Authors: Yamanoi Takashi , Nara Yukari , Matsuda Sho , Oda Yoshiki , Yoshida Akihiro , Katsuraya Kaname , Watanabe Mikio
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Diels—Alder Approach to (‐)‐Ovalicin (I).
Authors: Tiefenbacher Konrad , Arion Vladimir B. , Mulzer Johann
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A General Route to 4‐C‐Substituted Pyrimidine Nucleosides.
Authors: Hennecke Ulrich , Kuch David , Carell Thoms
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Novel Isoflavone from Urophylluma chinensis.
Authors: Guo Hui , Cai Xiaohua , Qian Junqing
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Wittig—Horner—Emmons Reactions of Triethyl 3‐Methylphosphonocrotonate with 3‐Formylchromones en route to Benzophenone‐Based Retinoid Candidates.
Authors: Sun Weilin , Desai Shyam , Piao Huri , Carroll Patrick , Canney Daniel J.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Trichlorocyanuric Acid: An Efficient Reagent for One‐Pot Synthesis of Ptychodiscus brevis (PB‐1) Toxin and Its Derivatives.
Authors: Gupta Arvind K. , Acharya Jyotiranjan , Dubey Devendra K. , Kaushik Mahabir P.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of (S)‐2‐Ethoxy‐3‐phenylpropanoic Acid Derivatives and Their Insulin‐Sensitizing Activity.
Authors: Wu Ying‐Hua , Xia Bing
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Rational Syntheses of Multinuclear High‐Spin Complexes
Authors: Oshio Hiroki , Nihei Masayuki
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Design and Synthesis of Chiral α,α‐Disubstituted Amino Acids and Conformational Study of Their Oligopeptides
Authors: Tanaka Masakazu
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Fluorinated Inhibitors of Matrix Metalloproteinases
Authors: Viani Fiorenza , Bruche Luca , Candiani Gabriele , Huguenot Florent , Jagodzinska Monika , Maffezzoni Raffaella , Moussier Nathalie , Sani Monica , Sinisi Roberta , Zanda Matteo
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Lamellarins: Isolation, Activity and Synthesis
Authors: Cironi Pablo , Albericio Fernando , Alvarez Mercedes
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Rare Earth Triflate Catalysts in the Synthesis of Vitamin E and Its Derivatives
Authors: Bonrath Werner , Dittel Claus , Giraudi Lisa , Netscher Thomas , Pabst Thomas
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Phosphazenes
Authors: Van De Grampel J. C.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Water in Organocatalytic Process: Debunking the Myths
Authors: Blackmond Donna G. , Armstrong Alan , Coombe Vyv , Wells Andrew
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Alkylidenepyrrolidines: Synthesis and Applications in Heterocyclic Chemistry
Authors: Elliott Mark C. , Wood John L. , Wordingham Stuart V.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Detection and Characterization of Intermediates in Chemical Reactions
Authors: Watt C. I. F.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Advances in Indium Triflate Catalyzed Organic Syntheses
Authors: Ghosh Rina , Maiti Swarupananda
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Nitric Oxide, a Double Edged Sword in Cancer Biology: Searching for Therapeutic Opportunities
Authors: Mocellin Simone , Bronte Vincenzo , Nitti Donato
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The Chemical Imagination at Work in Very Tight Places
Authors: Grochala Wojciech , Hoffmann Roald , Feng Ji , Ashcroft Neil W.
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
NMR Spectra of Anilines
Authors: Kolehmainen Erkki , Gawinecki Ryszard , Osmialowski Borys
Published: July 2007

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Pathoplasticity of bulimic features and interpersonal problems
Authors: Hopwood Christopher J. , Clarke Analesa N. , Perez Marisol
Published: July 2007

Objective:

Recent research suggests that interpersonal problems and some forms of psychopathology are pathoplastic, or that they mutually affect one another in nonetiological ways. In the current study, the pathoplasticity of bulimic features and interpersonal problems was tested.

Method:

Inventory of Interpersonal Problems‐64 data from 130 women with scores in the top quartile on the Bulimia scale of the Eating Disorder Inventory‐2 from a sample of 517 college undergraduates were cluster analyzed. Age, weight, and scores on psychopathology scales were tested for mean differences across the four quadrants of the interpersonal problems circumplex.

Results:

Consistent with the pathoplasticity hypothesis, cluster means did not differ on external variables. Furthermore, bulimic features and interpersonal problems independently predicted depression in the total sample.

Conclusion:

The interpersonal problems reported in the current study suggest differential treatment process that could inform the therapeutic relationship and help prevent premature termination. © 2007 by Wiley Periodicals, Inc. Int J Eat Disord 2007
Photocycloaddition in Natural Product Synthesis
Authors: Iriondo‐Alberdi Jone , Greaney Michael F.
Published: July 2007

The application of photocycloaddition to natural product synthesis continues to produce innovative and effective strategies for key bond constructions in the complex molecule environment. This Microreview surveys the recent literature for examples that illustrate the power and versatility of photocycloaddition chemistry, drawing from [2+2], [3+2], [4+2], [5+2] and [4+4] reactions. The discussion is confined to natural product syntheses, and will include photocycloaddition key steps in both completed routes and those in progress.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Recent Developments in Catalytic Aryl Coupling Reactions
Authors: Catellani Marta , Motti Elena , Della Ca' Nicola , Ferraccioli Raffaella
Published: July 2007

The present microreview is aimed at describing the evolution of the methodology used in aryl coupling reactions towards catalytically efficient and highly selective procedures, which have been achieved through the use of assisted and metallacycle‐directed reactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Fabrication of Active Horseradish Peroxidase Micropatterns with a High Resolution by Scanning Electrochemical Microscopy
Authors: Li Xuemei , Geng Qiaohong , Wang Yingying , Si Zhikun , Jiang Wei , Zhang Xiaoli , Jin Wenrui
Published: July 2007

We used a new reactive species OH− to fabricate active horseradish peroxidase (HRP) micropatterns with a high resolution by scanning electrochemical microscopy (SECM) coupled with a carbon fiber disk electrode as the SECM tip. In this method, except for active HRP micropatterns predesigned other regions on a HRP‐immobilized substrate were deactivated by OH− generated at the tip held at −1.7 V in 1.0 mol/L KCl containing 2.0×10−3 mol/L benzoquinone (BQ) (pH 8.0). The feedback mode of SECM with a tip potential of −0.2 V was used to characterize the active HRP micropatterns in 1.0 mol/L KCl containing 2.0×10−3 mol/L BQ and 2.0×10−3 mol/L H2O2.
Analysis of a second‐order upwind method for the simulation of solute transport in 2D shallow water flow
Authors: Murillo J. , García‐Navarro P. , Burguete J.
Published: July 2007

A two‐dimensional model for the simulation of solute transport by convection and diffusion into shallow water flow over variable bottom is presented. It is based on a finite volume method over triangular unstructured grids. A first‐order upwind technique, a second order in space and time and an extended first‐order method are applied to solve the non‐diffusive terms in both the flow and solute equations and a centred implicit discretization is applied to the diffusion terms. The stability constraints are studied and the form to avoid oscillatory results in the solute concentration in the presence of complex flow situations is detailed. Some comparisons are carried out in order to show the performance in terms of accuracy of the different options. Copyright © 2007 John Wiley & Sons, Ltd.
Forecasting domestic liquidity during a crisis: what works best?
Authors: Moore Winston R.
Published: July 2007

The 1990s were a turbulent time for Latin American and Caribbean countries. During this period, the region suffered from no less than 16 banking crises. One the most important determinants of the severity of banking a crisis is commercial bank liquidity. Banking systems that are relatively liquid are better able to deal with the large deposit withdrawals which tend to accompany bank runs. This study provides an assessment of whether behavioural models, linear time series or nonlinear time series models are better able to account for liquidity dynamics during a crisis.  Copyright © 2007 John Wiley & Sons, Ltd.
Treatment of chronic dilated cardiomyopathy with immunoadsorption using the staphylococcal A‐Agarose column: A comparison of immunoglobulin reduction using two different techniques
Authors: Burgstaler Edwin A. , Cooper Leslie T. , Winters Jeffrey L.
Published: July 2007

Auto‐antibodies to myocardial antigens have been implicated in the pathogenesis of chronic dilated cardiomyopathy (DCM). A protein A immunoadsorption affinity column system was used to remove IgG antibodies, particularly IgG3. Two techniques, the standard technique (T‐1) used for removal of IgG Factor VIII inhibitors and a technique (T‐2) designed to enhance IgG3 removal and address issues in venous access, minimize positive fluid balance, and adverse reactions were compared. A total of four patients were treated, two patients were treated for 5 consecutive days with each technique. T‐2 resulted in larger, but not significantly so, IgG3 reduction (70% and 63%) than T‐1 (53% and 59%). Both techniques lowered total IgG levels by ≥93%. Because of venous access problems, 60% of T‐1 procedures reached the plasma volume target versus 100% for T‐2. Positive fluid balance was significantly lower for T‐2 (+507 ± 465) ml versus T‐1 (+2,206 ± 724) ml. Overall adverse event (AE) rate (T‐1:16, T‐2:15) was similar between the techniques but demonstrated a statistically significant difference in the types of reactions that occurred. All AE were mild in nature, common to other apheresis procedures, and were easily managed. This small study, demonstrated that a modified technique (T‐2) with superior fluid balance should be used when treating DCM with the Immunosorba® system. J. Clin. Apheresis. 2007 © 2007 Wiley‐Liss, Inc.
Tracking planar orientations of active MRI needles
Authors: Sathyanarayana Shashank , Aksit Pelin , Arepally Aravind , Karmarkar Parag V. , Solaiyappan Meiyappan , Atalar Ergin
Published: July 2007

Purpose

To determine and track the planar orientation of active interventional devices without using localizing RF microcoils.

Materials and Methods

An image‐based tracking method that determines a device's orientation using projection images was developed. An automated and a manual detection scheme were implemented. The method was demonstrated in an in vivo mesocaval puncture procedure in swine, which required accurate orientation of an active transvascular needle catheter.

Results

The plane of the catheter was determined using two projection images. The scan plane was adjusted automatically to follow the catheter plane, and its orientation with respect to a previously acquired target plane was displayed. The algorithm facilitated navigation for a fast and accurate puncture.

Conclusion

Using image‐based techniques, with no mechanical design changes, the orientation of an active intravascular probe could be tracked. J. Magn. Reson. Imaging 2007. © 2007 Wiley‐Liss, Inc.
Focal pancreatic mass: Distinction of pancreatic cancer from chronic pancreatitis using gadolinium‐enhanced 3D‐gradient‐echo MRI
Authors: Kim Jai K. , Altun Ersan , Elias Jorge , Pamuklar Ertan , Rivero Hedrick , Semelka Richard C.
Published: July 2007

Purpose

To determine the accuracy of MRI including T1‐weighted gadolinium (Gd)‐enhanced three‐dimensional‐gradient‐echo (3D‐GE) sequences to distinguish pancreatic cancer from chronic pancreatitis in patients with pancreatic mass or focal enlargement.

Materials and Methods

The study included 22 patients (15 males and seven females; mean age ± SD, 56.2 ± 11.5 years) with pancreatic mass or focal enlargement. Fourteen had pancreatic carcinoma and eight had chronic pancreatitis based on the histopathological and clinical findings. MRI examinations of all patients were retrospectively evaluated by two independent reviewers for the predetermined imaging findings of carcinoma and chronic pancreatitis. The accuracy of MRI for differentiating pancreatic carcinoma from chronic pancreatitis was determined. MRI findings of both entities were compared using t‐tests, chi‐squared tests, and logistic regression analyses for the differentiation of these two entities. The extent of agreement between two reviewers was determined with Kappa statistics.

Results

The sensitivity and specificity of MRI including T1‐weighted 3D‐GE sequences for differentiating pancreatic carcinoma from chronic pancreatitis were 93% (13/14) and 75% (6/8), respectively. The most discriminative finding for pancreatic carcinoma was relative demarcation of the mass compared to background pancreas in contrast to chronic pancreatitis on post‐Gd 3D‐GRE sequences (P < 0.05).

Conclusion

MRI including Gd‐enhanced T1‐weighted 3D‐GE sequences can differentiate pancreatic carcinoma from chronic pancreatitis successfully in most cases. J. Magn. Reson. Imaging 2007. © 2007 Wiley‐Liss, Inc.
Identification of phosphoproteins and determination of phosphorylation sites by zirconium dioxide enrichment and SELDI‐MS/MS
Authors: Cuccurullo Manuela , Schlosser Gitta , Cacace Giuseppina , Malorni Livia , Pocsfalvi Gabriella
Published: July 2007

Reversible protein phosphorylation mediated by protein kinases and phosphatases is the most studied post‐translational modification. Efficient characterization of phosphoproteomes is hampered by (1) low stoechiometry, (2) the dynamic nature of the phosphorylation process and (3) the difficulties of mass spectrometry to identify phosphoproteins from complex mixtures and to determine their sites of phosphorylation. Combination of the phosphopeptide enrichment method with MALDI‐TOFMS, or alternatively, with HPLC‐ESI‐MS/MS and MS3 analysis was shown to be a step forward for the successful application of MS in the study of protein phosphorylation. In our study we used phosphopeptide enrichment performed in a simple single‐tube experiment using zirconium dioxide (ZrO2). A simple protein mixture containing precipitated bovine milk caseins was enzymatically digested and the mixture of tryptic fragments was analysed before and after enrichment using nanoflow HPLC‐ESI‐MS/MS and surface‐enhanced laser desorption/ionization (SELDI)‐MS/MS on QqTOF instruments to compare the efficiency of the two methods in the determination of phosphorylation sites. Both approaches confirm the high selectivity obtained by the use of batch‐wise, ZrO2‐based protocol using di‐ammonium phosphate as the eluting buffer. More phosphorylation sites (five for β‐casein and three for αS1‐casein) were characterized by SELDI‐MS/MS than by nanoflow HPLC‐ESI‐MS/MS. Therefore, ZrO2‐based phosphopeptide enrichment combined with SELDI‐MS/MS is an attractive alternative to previously reported approaches for the study of protein phosphorylation in mixtures of low complexity with the advance of fast in situ peptide purification. The method was limited to successful analysis of high‐abundance proteins. Only one phosphorylation site was determined for the minor casein component αS2‐casein by ESI‐MS/MS and none for κ‐casein. Therefore an improvement in enrichment efficiency, especially for successful phosphoproteomic applications, is needed. Copyright © 2007 John Wiley & Sons, Ltd.
Determination of thiazolidine‐4‐carboxylates in urine by chloroformate derivatization and gas chromatography‐electron impact mass spectrometry
Authors: Shin Ho‐Sang , Ahn Hye‐Sil , Lee Byung‐Hoon
Published: July 2007

The derivatization method of thiazolidine‐4‐carboxylic acid (TZCA) and methyl‐thiazolidine‐4‐carboxylic acid (Me‐TZCA) in urine with alcohol/chloroformate was achieved. TZCA and Me‐TZCA were derivatized in one step in urine with ethyl chloroformate in 1 min at room temperature. The derivatives of TZCA and Me‐TZCA had very good chromatographic properties and offered very sensitive response for gas chromatography‐electron impact ionization‐mass spectrometry (GC‐EI‐MS). On the basis of derivatization, the method for simultaneous determination of TZCA and Me‐TZCA in human urine was developed. Deuterated Me‐TZCA (Me‐TZCA‐d4) was synthesized as the internal standard (IS) for the analysis of urine samples. TZCA and Me‐TZCA were derivatized and extracted from urine at pH 9.5 with toluene, and then the dried extract was dissolved with 100 µl ethyl acetate and injected in GC/MS system. The recoveries of TZCA and Me‐TZCA were about 102 and 103%, respectively, at the concentration of 0.05 mg/l. The method detection limits (MDL) were 1.0 and 0.5 µg/l, respectively, for TZCA and Me‐TZCA in 1 ml human urine. The coefficients of variation of TZCA and Me‐TZCA were less than 6% at the concentrations of 0.05 and 0.2 mg/l, respectively. To assess the formation of TZCA during inhalation with formaldehyde (FA) (about 3.1 and 38.1 ppm FA in air), urine samples from rats were taken during 3 days after initiation of treatment. The mean amount of TZCA determined was 0.07 mg/l in control group and 0.18 mg/l during treatment with 3.1 ppm. The TZCA levels increased up to about 1.01 mg/l during treatment with 38.1 ppm. It is planned to study whether urinary TZCA can be used as an indicator in the biological monitoring of exposure to FA. Copyright © 2007 John Wiley & Sons, Ltd.
Genetic heterogeneity, evolution, and recombination in noroviruses
Authors: Phan Tung Gia , Kaneshi Kunio , Ueda Yuichi , Nakaya Shigekazu , Nishimura Shuichi , Yamamoto Atsuko , Sugita Kumiko , Takanashi Sayaka , Okitsu Shoko , Ushijima Hiroshi
Published: July 2007

Norovirus is one of the most common causes of nonbacterial gastroenteritis in humans. A total of 603 fecal specimens collected from sporadic pediatric cases of acute gastroenteritis in Japan from 2004 to 2005 were tested for the presence of norovirus by RT‐PCR. It was found that 51 (8.5%) specimens were positive for norovirus. The norovirus genotypes detected in this study were GII/1, GII/2, GII/3, GII/4, GII/6, and GII/7. Of these, GII/3 was the most predominant (52.9%), followed by GII/4 (37.2%) and others. It was noticed that four distinct types of recombinant noroviruses were co‐circulating and the variant norovirus GIIb suddenly emerged to be the leading strain in Japan for the first time. A novel norovirus nomenclature was proposed, in which worldwide noroviruses were classified into seven distinct genogroups (I–VII). Norovirus GI and GII consisted of 16 genotypes with 32 subgenotypes and 23 genotypes with 34 subgenotypes, respectively. Of note, human and porcine noroviruses had a close genetic relationship within GII. Interestingly, multiple short amino acid motifs located at N terminus, S domain, P1 domain, P2 domain, and C terminus of capsid gene correctly defined the phylogenetic norovirus genogroups, genotypes, and subgenotypes. Another interesting feature of the study was the identification of eight hitherto unreported recombinant noroviruses. It was noteworthy that three different types (intergenogroup, intergenotype, and intersubgenotype) of recombination in noroviruses were also found. This is the first report to demonstrate the existence of intergenogroup and intersubgenotype recombinations in noroviruses and highlights a possible route of zoonoses in humans because porcine, bovine and murine noroviruses belong to genogroups II, III, and V, respectively. J. Med. Virol. 79:1388–1400, 2007. © 2007 Wiley‐Liss, Inc.