bluuebunny/crossref_metadata_2025 huggingface dataset:
A Rapid and Efficient One-Pot Synthesis of Substituted 2-(5H)-furanones under focused microwave irradiations
Authors: Liao Liang , Villemin Didier
Published: December 2009

3-Hydroxy-3-methyl-2-butanone 1 reacted with ethyl cyanocetate in 2 in the presence of sodium ethoxide under focused microwave irradiations to afford 3-cyano-4,5,5-trimethyl-2-( 5H)-furanone 3. Furanone 3 then condensed with aromatic or heteroaromatic aldehydes 4a–h to produce 3-cyano-4-( trans-aryl-vinyl)-5,5-dimethyl-2-( 5H)-furanones 5a–h in high overall yields (71–88%).
Ionic Strength Dependence of Formation Constants, Protonation and Complexation of Phenylalanine with Dioxovanadium(V) at different temperatures
Authors: Gharib Farrokh , Zare Karim , Majlesi Kavosh
Published: December 2009

The protonation constants of phenylalanine and the stability constants of the complexes between dioxovanadium(V) ion and phenylalanine have been determined spectrophotometrically, in the temperature range 15–35°C and ionic strength ranging from 0.1 to 1.5 mol dm−3 sodium perchlorate as a background salt, in the pH range 1.5–10.5, with high ligand to metal ratios. The values of enthalpy and entropy changes based on these formation constants were calculated. The dependence of protonation and the stability constants on ionic strength are described by a Debye-Huckel type equation.
Solvent Extraction of Zinc from Acidic Calcium Chloride Solutions by Cyanex 923
Authors: Martínez Susana , Alguacil Francisco José
Published: December 2009

The reaction of zinc chloride with Cyanex 923 (phosphine oxide) in Solvesso 100 has been studied from acidic calcium chloride solutions. The distribution coeffient of zinc is independent of equilibrium pH, thus, suggesting a solvation extraction mechanism. Experimental data indicate that the reaction is exothermic (Δ H° = −55.2 kJmol−1). Slope analysis for the system at various Cyanex 923 concentrations reveals the formation in the loaded organic phases of species which probable 1:2 (Zn: Cyanex 923) stoichiometries. The stoichiometric factor of water in the extraction reaction was found to be 0, 1 or 2, whereas experimental data indicated that two chloride ions are involved for each metal extracted.
Nickel (II) and Iron (II) / Dowex 50W: An Effective Catalyst for the Baeyer–Villiger Oxidation of Ketones using Molecular Oxygen and Benzaldehyde
Authors: Hashemi Mohammed M. , Beni Yousef A.
Published: December 2009

A mixture of Ni(II) and Fe(II) supported on Dowex 50W catalyses Baeyer–Villiger oxidation of ketones using molecular oxygen and benzaldehyde
[Tetra(n-butyl)ammonium] [di(μ-bromo) bis{dichloro(p-tolyl)antimonate(III)}]: Synthesis and crystal structure
Authors: Singh Ajai K. , Amburosea C.V. , Jha N. K. , Sharma P. , Cabrera A. , E-Perz G.
Published: December 2009

The crystal structure of a salt of mixed trihalo(aryl)antimonate(III) anion, [ n-Bu4N]2[( p-tol)Cl2Sb(μ-Br)2SbCl2( p-tol)] ( p-tol = p-tolyl) reveals that the anion is dimeric in nature and two Sb atoms of the dimer are asymmetrically bridged by bromide ions (Sb-Br(bridging) = 2.985(2) / 3.373(1) Å).
Oxidative cyclization of some 1-Aryl-5-(tetrazol-5-ylmethyl)pyrrolidin-2-ones and of a related piperidin-2-one. Preparation of fused tetracyclic tetrazolobenzodiazepinone derivatives
Authors: Giang Le Thanh , Fetter József , Kajtár-Peredy Mária , Lempert Károly , Bertha Ferenc , Keserü György M. , Czira Gábor
Published: December 2009

In contrast to compounds of type 1a, compounds 1c–1i, when treated with lead(IV) acetate or cerium(IV) ammonium nitrate, underwent oxidative cyclizations to afford the corresponding compounds of type 3 with both oxidants, while oxidation of compound 1p afforded compound 2a (m = n = 1).
Microwave assisted Willgerodt-Kindler reaction of styrenes
Authors: Moghaddam Firouz Matloubi , Ghaffarzadeh Mohammad , Dakamin Mohammad G.
Published: December 2009

Styrenes are efficiently transformed to thioamides via the Willgerodt-Kindler reaction under microwave irradiation.
Functionalization of 1-methyl-1H-imidazole-5-carboxylic acid at the C-2 position: Efficient syntheses of 2-substituted t-butyl 1-methyl-1H-imidazole-5-carboxylates
Authors: Collman James P. , Zhong Min , Boulatov Roman
Published: December 2009

A number of 2-substituted t-butyl 1-methyl-1H-imidazole-5-carboxylates, which can be readily converted to the corresponding acids, were efficiently prepared from t-butyl 2-bromo-1-methyl-1H-imidazole-5-carboxylate via brominelithium exchange or palladium-catalysed coupling.
Synthesis of 5-formyl-17-nitrocalix[4]arenes in the 1,3-alternate conformation
Authors: Arimura Takashi , Ide Seiji , Nishioka Takuya , Sugihara Hideki , Murata Shigeo , Yamato Takehiko
Published: December 2009

Three 1,3-alternate-5-formyl-17-nitrocalix[4]arenes (4, 5, 7) bearing two propoxyl groups at one side (at 25 and 27 positions) and two benzyloxyl or propoxyl groups at the other side were synthesized.
Synthesis of 3c,4r,5t-1,2-dimethyl-3,5-diaryl pyrazolidine-4-carboxylic acid via intermolecular [3++2] cycloaddition
Authors: Liu Ligang , Ji Min , Hua Weiyi , Liu Hong
Published: December 2009

1,2-Dimethyl-3,5-diarylpyrazolidine-4-carboxylic acid derivatives 4a–d were synthesised stereo-selectively via intermolecular [3++2] cycloaddition of aldehydes 1a–d and 1,2-dimethylhydrazine dihydrochloride (2) with ethyl trans-cinnamate (3), stereochemistries of which were assigned by 1H-NOESY spectroscopy, and relative configurations confirmed by X-ray diffraction of one of them (4a).
Four new sesquiterpenoids from the soft coral Nephthea chabrollii
Authors: Rao M. Rama , Sridevi K.V. , Venkatesham U. , Rao T. Prabhaker , Lee S.S. , Venkateswarlu Y.
Published: December 2009

Chemical examination of the soft coral Nephthea chabrolii collected from the Mandapam coast in the Gulf of Mannar, afforded nine sesquiterpenoids of which four (1–4) are new. The structures of the new compounds (1–4) have been established by the interpretation of spectral data (UV, IR, 1H NMR, 13C NMR, 1H-1H COSY, NOESY and mass) and chemical methods.
A novel method for the chemoselective reduction of azides to amines with a Sm/CoCl2 · 6H2O system
Authors: Wu Huayue , Chen Rener , Zhang Yongmin
Published: December 2009

Azides can be easily reduced to the corresponding amines with Sm/CoC12 · 6H2O in excellent yields under mild and neutral conditions.
A model complex for carbonic anhydrases: Crystal structure of tris-imidazole maleato zinc(II) dihydrate
Authors: Zhang Cungen , Du Wenzhong , Mei Yamin
Published: December 2009

A novel zinc complex containing three simple imidazole rings as a model compound for carbonic anhydrase and as a rare model for the carboxylate–imidazole–zinc triad interactions frequently observed in zinc enzymes has been made and its structure determined by X-ray diffraction in which the zinc atom has a distorted tetrahedral geometry.
A Simple Method for the Preparation of Monomethyl Esters of Dicarboxylic Acids by Selective Esterification of the Nonconjugated Carboxyl Group in the Presence of an Aromatic or Conjugated Carboxyl Group
Authors: Ram Ram N. , Meher Nabin Kumar
Published: December 2009

Various dicarboxylic acids have been converted selectively into monomethyl esters in which the nonconjugated carboxyl group is selectively esterified in the presence of an aromatic or conjugated carboxyl group at room temperature (~ 25–27° C) in methanol using a catalytic amount of thionyl chloride.
A Simple Synthesis of Novel 6,7,8,9-Tetrahydro-2-Thia-3,5,6,9-Tetraazabenz[Cd]Azulenes
Authors: Tumkevicius Sigitas , Kaminskas Andrius , Kulbokaite Jolanta
Published: December 2009

A convenient method for the synthesis of ethyl 6-substituted 6,7,8,9-tetrahydro-2-thia-3,5,6,9-tetraazabenz[cd]azu-lene-1-carboxylates – representing a new heterosystem – from the corresponding ethyl 4,5-diaminothieno[2,3-d]pyrimidine-6-carboxylates, by a two-step protocol is described.
Tellurium Mediated Reduction of Aromatic Nitro Groups
Authors: Khan Rahat H.
Published: December 2009

Treatment of a wide range of aromatic nitro compounds with tellurium powder in aqueous methanolic ammonium chloride results in selective reduction of the nitro groups; ester, nitrile, amide and halide substituents are unaffected.
Samarium Diiodide Induced Reductive Cyclization of Nitro Compounds with Ketones: A Novel Synthesis of 3,4-Dihydro-(2H)-1,2,4-Benzothiadiazine-1,1-Dioxides
Authors: Zhong Weihui , Chen Xiaoyuan , Zhang Yongmin
Published: December 2009

The intermolecular reductive cyclization of o-nitrobenzenesulfonamides with ketones induced by samarium diiodide has been studied and 3,3-disubstituted-3,4-dihydro-(2H)-1,2,4-benzothiadiazine-1,1-dioxides were obtained in satisfactory yields under mild and neutral condition.
Novel Bifunctional Catalysts of Cobalt Phthalocyanine Bonded to Organic-Functionalized Basic Calcined Mg–Al Hydrotalcite for Autoxidation of Mercaptans
Authors: Liu Haichao , Yang Xiyao , Ran Guopeng , Min Enze
Published: December 2009

Two novel bifunctional catalysts, cobalt(II) 2,9,16,23-tetraaminophthalocyanine CoPc(NH2)4 bound to basic calcined Mg–Al hydrotalcite (Mg/Al=3:1) modified with organic functional groups by complexation and by covalent linkage, respectively, have been found to exhibit higher catalytic activity and stability in 1-octanethiol autoxidation than the corresponding supported CoPc(NH2)4 catalyst under equivalent reaction conditions.
Synthesis of Ionone and Methylionone Analogues from Delta-Pyronene
Authors: Lambertin Frédéric , Taran Martine , Delmond Bernard
Published: December 2009

“Iso”-beta-ionone and “iso”-beta-isomethylionone have been prepared from delta-pyronene via 1,6,6-trimethyl-2-methylene cyclohexan-1-ol.
Determination and Structural Correlation of PkA Values of P-Substituted Trans-β-Aroylacrylic Acids
Authors: Pfendt Lidija , Popović Gordana , Kostić Milka , Stevović Ljubomir , Drakulić Branko , Juranić Ivan
Published: December 2009

For a series of 10 p-substituted trans-β-aroylacrylic acids, pKa values were determined spectrophotometrically in water at 25°C and at ionic strength 0.1 M (NaCl). The thermodynamic pKa values were correlated with Hammett σp constants.
Kinetics and Mechanism of the Oxidation of Aliphatic Alcohols by Benzyltrimethyl-Ammonium Chlorobromate
Authors: Sharma Anjana Pradeep K. , Banerji Kalyan K.
Published: December 2009

The oxidation of alcohols by benzyltrimethylammonium chlorobromate, to the carbonyl compounds, proceeds by a hydride transfer from the alcohol to chlorobromate ion.
Synthesis of Novel Dna Binding Agents: Indole-Containing Analogues of Bis-Netropsin
Authors: Khalaf Abedawn I , Pitt Andrew R. , Scobie Martin , Suckling Colin J. , Urwin John , Waigh Roger D. , Fishleigh Robert V. , Young Stephen C.
Published: December 2009

Molecular modelling studies showed that indole dicarboxylic acids are potential linkers for the synthesis of bis-netropsin analogues with a good fit to the minor groove of DNA. To test this hypothesis, 2-carboxyindole-6-acetic acid, indole-2,6-dicarboxylic acid, 6-(2-carboxyethyl)indole-2-carboxylic acid, 6-(2-carboxy-1-ethenyl)indole-2-carboxylic acid were prepared and coupled to 3-[1-methyl-4-(1-methyl-4-aminopyrrole-2-carboxamido)pyrrole-2-carboxamido]dimethylaminopropane. Similarly indole-2,5-dicarboxylic acid was prepared and coupled to 3-[1-methyl-4-(1-methyl-4-aminopyrrple-2-carboxamido)pyrrole-2-carboxamido]propionamidine hydrochloride. The derivatives of 26–28 showed especially strong binding to AT rich regions as shown by footprinting studies.
An Efficient Conversion of P-Hydroxybenzylic Alcohols into P-Hydroxybenzylic Ethers and Thioethers
Authors: Das Biswanath , Venkataiah Bollu , Madhusudhan Purushotham
Published: December 2009

Different p-hydroxybenzylic alcohols were converted into p-hydroxybenzylic ethers and thioethers in excellent yields by treatment with alcohols and thiols respectively in the presence of catalytic amounts of ceric ammonium nitrate (CAN).
Behaviour of 2,3-Dihydro-1H-Benzo[D]Imidazole-2-Thione towards Amines under Mannich-Type Condition
Authors: Hamama W.S.
Published: December 2009

2,3-Dihydro-1H-benzo[d]imidazole-2-thione (1) was subjected to a Mannich reaction with either dimethylamine, urotropine, morpholine, thiomorpholine, (±) 3,3,5 trimethylhexahydroazepine, piperazine or p-bromoaniline and formalin in different molar ratios to afford the Mannich bases. The reactivity of the Mannich base 5a towards indole was also investigated. In addition the condensation of hydroxymethyl derivative 10 with morpholine, benzimidazole, p-bromoaniline, tryptamine and aminiothiazole was achieved.
Montmorillonite Catalysed Synthesis of Novel Spiro[3H-Indole-3,3′- [3H-1,2,4] Triazol]-2(1H) Ones in Dry Media under Microwave Irradiation
Authors: Dandia Anshu , (nee’ Taneja) Harshita Sachdeva , (Singh) Ruby Devi
Published: December 2009

A new route for the one pot synthesis of novel spiro[3H-indole-3,3′-[3H-1,2,4] triazol]-2 (1H) ones utilizing 3-arylimino-2H-indol-2-ones (3) and thiosemicarbazide (4) as starting material under microwave irradiation is reported. Complete conversion was observed by TLC which also showed the formation of a single product.
The Reaction of Heteroaroyl-Substituted Heterocyclic Ketene Aminals with Arylhydroximic Acid Chloride: An Efficient Synthesis of Polysubstituted Isoxazoles
Authors: Liu Bo , Wang Mei-Xiang , Huang Zhi-Tang
Published: December 2009

The heteroaroyl-substituted heterocyclic ketene aminals 1 or 2 reacted smoothly with arylhydroximic acid chlorides 3 to give the polysubstituted isoxazoles 4–7.
Cathodic Reduction of O-Ethyl S-Phenacyl Dithiocarbonate
Authors: Picazo O. , Batanero B. , Barba F.
Published: December 2009

The cathodic reduction of O-ethyl S-phenacyl dithiocarbonate (1) yields O-ethyl (benzoyl)-thioacetate (2) and O-ethyl S-[(ethoxythiocarbonyl)(phenacyl)]-dithiocarbonate (3) through an Eschenmoser process with an electrogenerated base (EGB).
Synthesis, Spectral Studies and Biological Activity of 4′-Oxothiazolidinyl Benzimidazoles
Authors: Kokitkar S.V. , Shetgiri N.P.
Published: December 2009

New 2-methyl-1-[(2′-substituted phenyl-4′-oxothiazolidinyl)aminocarbonylmethyl)]-1H-benzimidazoles (3) and 2-methyl-1-[(2′-substituted phenyl-5′-methyl-4′-oxothiazolidinyl) aminocarbonylmethyl]-1H-benzimidazoles (4) are synthesized, characterized and evaluated for their antimicrobial and antitubercular activity.
Desilylation-acetylation of Trimethylsilyl Ethers with Acetic Anhydride Catalysed by Montmorillonite K-10
Authors: Movassagh Barahman , Lakouraj Moslem M. , Fasihi Jalal
Published: December 2009

Two mild and simple one-step desilylation-acetylations of a variety of alkyl- and aryl-trimethylsilyl ethers, Me3SiOR(Ar), with acetic anhydride in the presence of montmorillonite K-10 clay are described.
Synthesis of Organic Sulfides from Disulfides Using a Zn/Alcl3 System in Aqueous Media
Authors: Movassagh Barahman , Lakouraj Moslem M. , Fadaei Zahra
Published: December 2009

A convenient procedure for the synthesis of organic sulfides from different alkyl halides and aryl disulfides by a Zn/AlCl3 system in aqueous media is presented.
Microwave-Assisted Efficient synthesis of Dihydro Pyrimidines: Improved High Yielding Protocol for the Biginelli Reaction
Authors: Yadav J.S. , Reddy B.V. Subba , Reddy E. Jagan , Ramalingam T.
Published: December 2009

Dihydropyrimidines were synthesised in high yields by one-pot cyclocondensation reaction of aldehydes, aceto-acetates and urea using various acid catalysts like Amberlyst-15, Nafion-H, KSF clay and dry acetic acid under microwave irradiation.
Tributyltin Hydride-Mediated Tandem reactions of Dehydroalanines Leading to α-Substituted Pyroglutamates
Authors: Baker S. Richard , Goodall Karen , Parsons Andrew F. , Wilson Michelle
Published: December 2009

Tributyltin hydride-mediated cyclisation of dehydroalanines produces an intermediate captodative radical, which can be trapped by reaction with oxygen- or carbon-centred radicals or (principally) electron-poor alkenes, to provide a quick approach to a variety of α-substituted pyroglutamates.
Indium-Mediated Barbier allylations of Hydroxyanthraquinones: An Expedient synthesis of Novel 10-Alkenyl-10-Hydroxy-9(10H)-Anthracenones
Authors: Kumar Subodh , Kumar Vijay , Chimni Swapandeep Singh
Published: December 2009

Indium-mediated allylations of 1,8-dihydroxy-9,10-anthraquinone with allyl, cinnamyl and crotonyl bromides/ chlorides and 1,4- and 1,5- dihydroxy derivatives with allyl bromide in THF–MeOH–H2O gave the respective 10-alkenyl-10-hydroxy-9(10H)-anthracenones in excellent yields.
Samarium-Mediated Iodine-Catalysed Reductive amination of the Adamantyl Methyl Ketone
Authors: Banik Bimal K. , Zegrocka Oliwia , Becker Frederick F.
Published: December 2009

Adamantyl amines were prepared by samarium-metal induced iodine-catalysed reduction of the imines in a one-pot operation.
Am1 study of Conformational properties of (E)-Cyclononene
Authors: Yavari Issa , Kabiri-Fard Hassan , Moradi Shahram
Published: December 2009

The unsymmetrical chair–chair (CC) conformation of (E)-cyclononene is calculated to be 5.7 kJ/mol more stable than the axial-symmetrical twist-chair-chair (TCC) form; the calculated energy barrier for ring inversion of the CC conformation is 45.6 kJ/mol, while the barrier for swivelling of the double bond through the polyethylene bridge is 119.5 kJ/mol.
A Mechanistic Study concerning the Carbon-Silicon Bond Cleavage in Acylsilane Bioreductions
Authors: Patrocínio Amauri F. , Moran Paulo J. S.
Published: December 2009

Some mechanistic proposals are made for the competitive desilylation reactions affording the corresponding primary alcohol and carboxylic acid that frequently occur in the bioreduction of acylsilanes.
An Efficient synthesis of Dimethoxyphthalides
Authors: Paradkar Madhusudan V. , Kulkarni Sanjeev A. , Joseph Augustine R. , Ranade Anup A.
Published: December 2009

This communication describes a convenient route for the synthesis of naturally occurring dimethoxyphthalides using a Vilsmeier-Haack formylation.
Reduction of carboxylato-bound chromium(IV) by hydrazine
Authors: Kumar Manjuri , Ghosh Sanchita P. , Koley Aditya P. , Ghosh Manik C.
Published: December 2009

Aqueous chromium(IV), stabilised through ligation by 2-ethyl-2-hydroxybutanoate ion, undergoes facile reduction with hydrazine, and this electron transfer process is inhibited by excess ligand anion, as well as by hydrogen ion.
Molecular electronic branching ratios of CaI(A2Π1/2,3/2,B2Σ+) resulting from the reaction of Ca[4s4p(3PJ)] with CH3I following the pulsed dye-laser excitation of atomic calcium
Authors: Husain D. , Geng J. , Castaño F. , Rayo M.N. Sanchez
Published: December 2009

Molecular electronic branching ratios to yield CaI(A2Π1/2), CaI(A2Π3/2) and CaI(B2Σ+) have been determined following the reaction of Ca[4s4p(3PJ)], 1.888 eV above the 4s2(1S0) ground state, with CH3I. These were determined from the combination of time-dependence and calibrated integrated intensity measurements of the atomic resonance fluorescence from Ca(43P1 → 41S0) and the molecular chemiluminescence from CaI(A2Π1/2,A2Π3/2,B2Σ+ → ×2Σ+) following pulsed dye-laser generation of Ca(43P1). The results were found to be as follows: A1/2 (2.7 ± 1.1) × 10−3, A3/2 (2.6 ± 1.3) × 10−3 and B, (2.0 ± 0.8) × 10−3.
Intramolecular nitrone- and azomethine ylidecycloaddition reactions at the periphery of pyrido[1,2-a]pyrimidin-4(4H)-one system
Authors: Noguchi Michihiko , Akao Ryosuke , Gotoh Mitsuhiro , Kawamoto Hideyasu , Kakehi Akikazu
Published: December 2009

Isoxazolo[4′,3′:4,5]pyrido- and pyrrolo[2′,3′:4,5]pyrido-[2,3-d]pyrido[1,2-a]-pyrimidines were obtained in the intramolecular cycloaddition reactions of the nitrone and azomethine ylide at the periphery of pyrido[1,2-a]pyrimidin-4(4H)-one system, respectively.
A Novel Catalytic role of Molecular Iodine in the Oxidation of Benzylic Alcohols: Microwave-Assisted Reaction
Authors: Mukhopadhyay Chhanda , Becker Frederick F. , Banik Bimal K.
Published: December 2009

Molecular iodine was used to catalyse the oxidation of several benzylic alcohols to the corresponding ketones under the microwave-irradiated method, and the role of iodine was explored.
Main NMR Characteristics of Synthetic (25r)-5α-furostanes
Authors: Iglesias-Arteaga Martin A. , Martínez Carlos Pérez , Manchado Francisco Coll
Published: December 2009

The assignment of 13C signals of synthetic (25R)-5α -furostanes together with the main 1H characteristics of the furostane side chain are presented. The main effects on chemical shifts due to conversion of ring F into an open chain are briefly discussed.
Potassium Ferrate Supported onto Montmorillonite K-10: A Mild, Efficient and Inexpensive Reagent for Oxidative Deprotection of Trimethylsilyl Ethers in Non-Aqueous Conditions
Authors: Tajbakhsh Mahmood , Heravi Majid M. , Habibzadeh Setareh , Ghassemzadeh Mitra
Published: December 2009

Potassium ferrate supported onto montmorillonite K-10 was found to deprotect trimethylsilyl ethers oxidatively to the corresponding carbonyl compounds in non-aqueous conditions.
Synthesis of 1-Substituted Indole-3-Carboxaldehyde related to Acyclic Nucleosides and their Condensed Pyrenyl Derivatives
Authors: Zahran Magdy A. , Afify Hanan M. , Pedersen Erik B. , Nielsen Claus
Published: December 2009

Indole-3-carboxaldehyde was N-alkylated to give the corresponding acyclic nucleosides 3a–h which were condensed with 1-pyrenamine and 1-acetylpyrene to give 5a,c,e–g and 7b–d,e,g, respectively. The Schiff's bases 5a and 5e with 2-hydroxyethyl and methylthiomethyl N-1 substituents were found moderately active against HIV-1.
Oxidation of Benzylamine by ClOH and N-Chlorosuccinimide: A Kinetic Study
Authors: Antelo Juan M. , Arce Florencio , Crugeiras Juan , Pastoriza Cristina , Ríos Ana
Published: December 2009

The reaction of benzylamine with N-chlorosuccinimide involves addition of the amine to electrophilic chlorine to yield N-chlorobenzylamine and not hydride abstraction at the α-carbon of the amine by the oxidant as proposed in the literature.
Carbanion induced synthesis of pyrido[2,1-b] benzothiazoles through ring transformation reactions
Authors: Ram Vishnu Ji , Srivastava Pratibha , Agarwal Nidhi
Published: December 2009

3-Aryl-1-[(E)-cyanomethylidene]-1H-pyrido[2,1-b]benzothiazole-4-carbonitriles (3) and the polysubstituted pyrido[2,1-b]benzothiazoles (8, 9) have been prepared from the reaction of 2-benzothiazoleacetonitrile (2) with 6-aryl-4-methylsulfanyl-2-oxo-2H-pyran-3-carbonitrile (1) and the ketenedithioacetals (6, 7), respectively.
Synthesis of naturally occurring cinnamyl cinnamates
Authors: Mali Raghao S. , Papalkar Abhijit S.
Published: December 2009

A convenient, high yield and general method is described for the synthesis of cinnamyl cinnamates (1a–f, 2a–c and 2e) from benzaldehydes (7a–f). The aldehydes (7a–f) on reaction with phosphorane (6) provide the (E,E) - cinnamyl cinnamates (1a–f) in high yields together with the (E,Z) - esters (2a–c and 2e) in low yields in the same reaction.
Synthesis and evaluation of antifungal and antibacterial activity of ethyl 3,5-diarylisoxazole-4-carboxylates
Authors: Kumar K. Ajay , Rai K.M. Lokanatha , Umesha K.B.
Published: December 2009

Nitrile oxides generated in situ by the oxidative dehydrogenation of aldoximes (2) react with α-cyanocinnamate esters (1) to afford ethyl 3,5-diarylisoxazole-4-carboxylates (4) in good yield. The esters (4) were tested for their antimicrobial activity.
Bromination of steroidal 3-keto-4,6-diene
Authors: Jaime Arelys , Reyes Mayra , Ruiz José A. , Vélez Hermán , Méndez José M. , Suárez Margarita
Published: December 2009

The bromination reaction on 3-keto-4,6-diene steroids, via an epoxide intermediate, with hydrobromic acid in acetic acid medium gives the corresponding 6-bromo derivative. On the other hand, bromination with molecular bromine and subsequent dehydrobromination in an aprotic solvent and basic media afforded the unexpected 4-bromo derivative. In this work we suggest an alternative mechanism for explaining the bromine transposition from C6 to C4.
A Novel Derivative of Hexathiocane having the 4,5-Dimethylthio-1,3-Dithiol-2-Ylidene Moiety
Authors: Dai Jie , Zhou Min-Yan , Bian Guo-Qing , Wang Xin , Qing-Feng  , Xu  , Munakata  , Megumu  , Maekawa Masahiko
Published: December 2009

An unexpected reaction forming 4,8-bis(4,5-dimethylthio-1,3-dithiol-2-ylidene)-1,2,3,5,6,7-hexathiocane is described.
Selective Preparation of Fluorescent 1,8-Naphthalimides using Acidic Alumina under Microwave Irradiation
Authors: Pourjavadi Ali , Marandi Gholam Bagheri
Published: December 2009

7 H-benzimidazo[2,1- a]benz[ de]isoquinolin-7-one compounds were prepared in a selective manner by reaction between o-phenylenediamines and appropriate 1,8-naphthalenedicarboxylic anhydrides using acidic alumina under microwave irradiation.
Synthesis and Stereochemistry of 1,2,4,5-tetraarylimidazolidines
Authors: Dryanska Veneta , Pashkuleva Iva , Simova Svetlana , Angelova Silvia
Published: December 2009

Phase-transfer catalysed reaction of N-(benzylidene)benzylamine with arylmethyleneanilines afforded the stereoisomeric 1,2,4,5-tetraarylimidazolidines 3 and 4; a two-step addition–cyclisation mechanism was suggested on the basis of NMR analysis of the isolated products and the observed epimerisation of the prepared imidazolidines.
Stereochemistry of the [4 + 2] Cycloaddition Reactions of 5-Arylmethylene-2,4-Dithioxo-1,3-Thiazolidines with Acrylonitrile, 1-Ethoxy-3-Phenyl-E-2-Propen-1-One and 3-Phenyl-E-2-Propen-1-One
Authors: Omar Mohamed T. , El-Aasar Nadia K , Saied Khaled F.
Published: December 2009

The [4 + 2] cycloaddition reactions of 5-arylmethylene-2,4-dithioxo-1,3-thiazolidines with different dienophiles and separation of pure stereoisomeric products are reported.
Fluorescence Quenching of 2-amino-7-bromofluorene by Chloromethanes – Static and Dynamic Model for CCl4 Quenching in Polar Solvents
Authors: Radha N. , Swaminathan M.
Published: December 2009

The study of fluorescence quenching of 2-amino-7-bromofluorene (ABF) by chloromethanes (CH2Cl2, CHCl3, CCl4) in various solvents reveals that (i) the quenching constant kq depends on solvent viscosity for CCl4 and on solvent polarity for CH2Cl2 and CHCl3; (ii) the observed positive deviation in methanol and acetonitrile in the Stern–Volmer plot is due to the presence of a static component in quenching; (iii) the fluorescence quenching is mainly due to the formation of a non-emissive charge transfer complex in the excited state.
Microwave assisted Reduction of Schiff Bases by Triethylammonium Formate/Formic Acid System
Authors: Moghaddam Firouz Matloubi , Khakshoor Omid , Ghaffarzadeh Mohammad
Published: December 2009

Aryl schiff bases were efficiently reduced to the corresponding secondry amines by triethylammonium formate/formic acid system under microwave irradiation in solvent–free condition.
The Configuration of N-alkyl-anilino-s-triazine derivatives
Authors: Wu Zuwang , Yang Haiyan , Sun Zhonghai
Published: December 2009

The alkyl group on the imino bridge of heterobifunctional reactive dyes plays a major role in improving the dyeing properties. The configurations of a pair of model compounds 2,4-dimethoxy-6-anilino-s-triazine and 2,4-dimethoxy-6-(N-metyl-anilino)-s-triazine have been determined by X-ray diffraction analysis of single crystals. The planar angle between the triazinyl and phenyl rings of the above models are 8.35° and 72.22° respectively. It indicates that the steric effect of the ethyl group produces a non-planar configuration and leads to the improvement of the dyeing properties.
A Facile One-Pot Synthesis and Temperature Dependence of NMR Spectra of Stable Heterocyclic Phosphorus Ylids
Authors: Baharfar Robabeh , Heydari Akbar , Saffarian Narges
Published: December 2009

The addition of dialkyl acetylenedicarboxylates to isatin, a strong NH acid, in the presence of triphenylphosphine leads to stable crystalline phosphorus ylids in excellent yields and one of the three synthesised compounds (3a) exists as a mixture of two rotational isomers on the basis of variable temperature nmr spectroscopy.
Studies in Sigmatropic Rearrangement: Thermal Rearrangement of 3-(4′-aryloxybut-2-ynyloxy)thiochromen-4-ones
Authors: Majumdar Krishna C. , Roy Brindaban
Published: December 2009

Reaction of 3-hydroxythiochromen-4-ones 1a,b with appropriate1-aryloxy-4-chlorobut-2-ynes 2a–f furnished 3-(4′-aryloxybut-2-ynyloxy)thiochromenones 3a–g in 80–90% yields. Substrates 3a–g on refluxing in chlorobenzene for 8–10 h gave 3-aryloxymethyl-2-methylfuro[3,2- b]-thiochromen-9-ones in 90–95% yields.
A Revised Synthesis of the Antitumour Antibiotic L-azatyrosine via 2-iodo-5-methoxypyridine
Authors: Seton Alison W. , Stevens Malcolm F. G. , Westwell Andrew D.
Published: December 2009

A revised synthesis of the antitumour antibiotic L-azatyrosine is reported, the main features of which are the unam-biguous synthesis of the previously misinterpreted 2-iodo-5-methoxypyridine and subsequent palladium-catalysed coupling with an iodoalanine-derived zinc reagent.
Novel Fulvenes Capto-Datively Substituted at C6
Authors: Chandrasekhar Sosale , Sridharan Rajagopal
Published: December 2009

A set of four fulvenes bearing both electron-withdrawing and -donating aryl groups at C6 was prepared and shown to be fairly stable, except for the dimerisation of the anisyl-nitrophenyl-fulvene 1a, which also underwent a (4π + 2π) cycloaddition with C,N-diphenylnitrone.
Synthesis of Sulfones from Arenesulfonyl Chlorides and Alkyl Halides using the Sm/HgCl2 bimetallic system
Authors: Zhang Jiming , Zhang Yongmin
Published: December 2009

A simple and convenient procedure for the synthesis of sulfones from arenesulfonyl chlorides and alkyl halides using the Sm/HgCl2 bimetallic system in tetrahydrofuran is presented.
A Facial Synthesis of 7-Selenodaunomycinone Derivatives
Authors: Zhang Shu Jia , Wang Yan Guang
Published: December 2009

7-selenodaunomycinone derivatives 3a–e were synthesised by condensation of daunomycinone 2 with aryl selenols catalysed by trifluoroacetic acid in dichloromethane at room temperature. When the concentration of aryl selenol exceeds 2 to 2–3 times, 7-deoxydaunomycinone 4 can be obtained. Also 7 S-configuration of 3a can turn into 7 R-isomer catalysed by boron trifluoride-etherate.
Mechanism and Diastereoselectivity of the reactions between Naphthols and Imines
Authors: Boga Carla , Di Martino Emanuela , Forlani Luciano , Torri Federica
Published: December 2009

The mechanism of the title reactions involves a proton donor-acceptor interaction which is responsible also for the observed equilibration of diastereomers.
Deoximation with Hexamethylenetetramine-Bromine supported on Alumina in non-aqueous Condition
Authors: Beheshtiha Yahya Sh , Heravi Majid M , Sarmad Nooshin , Shoar Rahim Hekmat
Published: December 2009

Hexamethylenetetramine-bromine on alumina rapidly regenerates carbonyl compounds from their corresponding oximes in non-aqueous condition.
Microwave-assisted Synthesis of Derivatives of Chromanones
Authors: Barbry Didier , Champagne Philippe
Published: December 2009

A variety of chromanones are prepared from resorcinol and phloroglucinol in four steps: two of these reactions are conducted under microwave irradiation, the synthesis of cinnamic acids and the cyclisation of N-cinnamoylazoles.
Synergistic Complexes of Tributyl Phosphate and Dibutyl (Butyl) Phosphonate with Uranyl bis(β-diketonates). Synthesis, Characterisation and Molecular Structure of [UO2(TTA)2.TIBP]
Authors: Kannan S. , Raj S. Shanmuga Sundhara , Fun Hoong-Kun
Published: December 2009

Tributyl phosphate or dibutyl (butyl) phosphonate complexes of the type [UO2 (OO)2.X] (OO = TTA or DBM; X = TBP, TIBP or DBBP) have been prepared and characterised by 1H and 31P{1H} NMR, IR and elemental analyses. The structure of complex [UO2(TTA)2.TIBP] shows that the TIBP ligand coordinates through its phosphoryl oxygen atom to the uranyl ion.
Sulfurated Borohydride Exchange Resin: Reductive Cleavage of Aryl Acetates under Mild Conditions
Authors: Bandgar B.P. , Kamble V.T.
Published: December 2009

A variety of aryl acetates are selectively cleaved to the corresponding phenols using sulfurated borohydride exchange resin in methanol at 25°C. Other sensitive groups present elsewhere in the molecule remain unaltered under these reaction conditions.
Synthesis of 4,4′-di(mercaptomethylthio)-2,2′-bipyridine and in situ spectroscopic characterization of its electropolymerized films
Authors: Demets Gregoire J.F. , Toma Henrique E. , de Castro Mauricio C.R. , Donnici Claudio L.
Published: December 2009

Reported are the synthesis of 4,4 ‘-di(mercaptomethylthio)-2,2 ‘-bipyridine and its electrochemical polymerization in acetonitrile, producing films which are strongly adsorbed onto gold electrodes.
Regioselective Alkylation of Anthrone, 5,5-dimethyl-3-isoxazolidinone and 4-methylquinolone by phase transfer catalysis
Authors: Dehmlow Eckehard Volker , Bollhöfer Jörg , Thye Gorden
Published: December 2009

Anthrone (1) can be alkylated selectively to give O-, C,O- or C,C-substituted compounds 2, 4, or 5, respectively. Similarly, 5,5-dimethyl-3-isoxazolidinone (6) and 4-methylquinolone (9) yield N- or O-derivatives 7 and 8 or 10 and 11, respectively. The product ratios can be influenced strongly sometimes by use of different phase transfer catalysts, but the sensitivity of each reaction towards the catalysts is unique.
‘Through-space’ Csp-F Spin–Spin Couplings in Fluoroarenes
Authors: Szczeciński Przemysław , Mamiński Mariusz
Published: December 2009

Dicyanomethylene fluoroarenes, in which interaction between non-bonding electrons of fluorine atom and one of CN groups is expected, have been prepared and their 1H and 13C{H} NMR spectra have been measured and interpreted in terms of ‘through-space’ 19F,13C coupling.
Hypervalent Iodine in Synthesis 72: A Tandem Dimerisation-Cyclocondensation of Enaminones with [bis(trifluoroacetoxy)iodo]benzene: An Effective Method for the Synthesis of Highly Substituted Pyrroles
Authors: Zhang Peng-Fei , Chen Zhen-Chu
Published: December 2009

A tandem dimerisation–cyclocondensation of enaminones with [bis(trifluoroacetoxy)iodo]benzene(BTI) provides an effective method for the synthesis of highly substituted pyrroles. It has some advantages over existing methodologies such as accessible starting material, nontoxic reagents, mild reaction conditions.
The 1,3-dipolar Cycloaddition of Ethyl N-(ethoxycarbonylmethyl)benzimidate with N-aryl maleimides
Authors: Chen Ji-Jun , Rong Ya-Qian , Xu Ming-Hua , Pan Yi , Shi Yao-Zeng
Published: December 2009

1,3-Dipolar cycloaddition of ethyl N-(ethoxycarbonylmethyl)benzimidate (1) with N-aryl maleimides (2) gave a pair of pyrrolo[3,4- c]pyrrole isomers (3, 4) and a 7-azabicyclo[2.2.1]heptane derivative (5). The configuration of isomers 3 and 4 was confirmed by 1H-NMR.
Reduction of Cyclopropanecarboxylic Acids by Borane, a Chemoselective Reduction Sensitive to Steric Interactions and Reaction Conditions
Authors: Sydnes Leiv K. , Pereira Paula F. F. , Sandberg Marcel , Øvrebø Hans H.
Published: December 2009

A number of cyclopropanecarboxylic acids have been reduced by BH3 reagents in THF to the corresponding cyclopropyl alcohols; the yield is sensitive to the steric influence of the substituents attached to the ring, the reaction temperature, and the nature of the borane reagent.
Intramolecular (4π+4π) Photocycloaddition via Naphthalene-Furan Exciplex
Authors: Chiyonobu Kazuhiko , Konishi Gen-ichi , Inoue Yohtaro , Mizuno Kazuhiko
Published: December 2009

Irradiation of benzene solutions containing 4-cyano- and 4-methoxycarbonyl-1-naphthylmethyl furfuryl ethers afforded the (4π+4π) photocycloadducts via intramolecular singlet exciplexes as reactive intermediates in excellent yields.
Solvation and Temperature Effects on the Proton Transfer Equilibria between 2,5-dihydroxy-p-benzoquinone and amines
Authors: Habeeb Moustafa M. , Al-Wakil Hoda A. , El-Dissouky Aly , Refat Nesrine M.
Published: December 2009

Solvation and temperature effects on the proton transfer equilibrium constant KPT between 2,5-dihydroxy- p-benzoquinone (DHBQ) and some aliphatic and aromatic amines have been investigated spectrophotometrically by using UV-Vis spectroscopy.
Reactions of Pyrylium Salts with Nucleophiles. Part 26.1 the Reaction with the Cyanide Anion Revisited
Authors: Uncuta Cornelia , Tudose Adriana , Cãproiu Miron T. , Stavarache Carmen , Balaban Alexandru T.
Published: December 2009

Reaction mechanisms are provided for the formation of diastereomeric 2,4-dialkyl-6-oxo-2,4-heptadienonitriles (including minor diastereoisomers observed for the first time) from 2,4,6-trialkylpyrylium salts and aqueous sodium cyanide.
A Dinuclear Peroxo-Vanadium(V) Complex with Coordinated Tripeptide. Synthesis, Spectra and reactivity in Bromoperoxidation
Authors: Sarmah Swapnalee , Islam Nashreen S.
Published: December 2009

Synthesis of a triglycine peroxo-vanadate complex, [V2O2(O2)3(Gly-Gly-Gly)2].H2O by the reaction of V2O5 with H2O2 and the tripetide at pH 2 is described; the peroxo-bridged complex is highly effective in generating a bromination competent intermediate at physiological pH.
Oxygen Plasma Preparation of Nickel Oxide Layers
Authors: Bellakhal N. , Brisset J. L.
Published: December 2009

Nickel oxide thin films form and grow when Nickel foils are exposed to an inductively coupled low pressure oxygen plasma. The resulting oxide (NiO) is identified by near-grazing X-ray diffraction and by FTIR specular reflectance spectroscopy methods. The thickness of the NiO layer increases with exposure time.
Novel Organic Crystals as Candidates for Frequency Up-Converted Materials: Syntheses and Crystal Structures of Two Tröger's Bases
Authors: Bu Xian-He , Du Miao , Zhao Li-Juan , Tanaka Kentaro , Shionoya Mitsuhiko , Shiro Motoo
Published: December 2009

The syntheses and crystal structures of two novel Tröger's bases as candidates for frequency up-coverted organic materials are reported.
Reaction of Ferrocene Carboxylic Acid with Dicyclohexylcarbodiimide
Authors: Wang Qing Min , Huang Run Qiu
Published: December 2009

Ferrocene carboxylic acid was reacted with DCC in tetrahydrofuran at room temperature to give N,N′-dicyclohexyl-O-ferrocenoylisourea, which can be converted to N,N′-dicyclohexyl-N-ferrocenoylurea in dioxane at reflux temperature.
Synthesis and Electrochemical Properties of Bis([2.2]Metacyclophane) Bipyridinium
Authors: Tsuge Akihiko , Fukumaru Yoshihiro , Taniguchi Ryousuke , Moriguchi Tetsuji , Sakata Kazunori , Araki Koji
Published: December 2009

Bis([2.2]metacyclophane) bipyridinium was synthesized for the first time and it was found that this cyclophane compound was reduced at more negative potentials than the corresponding bipyridinium, having no cyclophane skeleton, due to a transannular CH–p interaction between the aromatic ring of the cyclophane and CH portion next to nitrogen atom.
Kinetics and Mechanism of Ruthenium(III) Chloride Catalysed Oxidation of Propane-1,3-Diol by Ceric Sulfate in Aqueous Sulfuric Acid Medium
Authors: Agrawal Anju , Sharma Indu , Gupta Divya , Khandelwal C.L. , Sharma P.D.
Published: December 2009

A mechanism based on kinetic and spectral studies has been proposed for the oxidation of propanediol by cerium(IV)
The Generation of Organic Radical Cations: A Guide to Current Practice for EPR Spectroscopic Studies
Authors: Davies Alwyn G.
Published: December 2009

A wide variety of methods is now available, each with its particular advantages and disadvantages, for generating radical cations for EPR or other spectroscopic studies in fluid solution or in matrix. This field is critically surveyed, together with recent developments in the understanding of the mechanisms of these reactions.
Oxidative Deprotection of Oximes with Peroxodisulfate under Heterogeneous Conditions1
Authors: Hirano Masao , Kojima Kazuma , Yakabe Shigetaka , Morimoto Takashi
Published: December 2009

A reagent combination of (NH4)2S2O8, a catalytic amount of AgNO3, in general, or Cu(NO3)2 in particular, and moist montmorillonite K10 clay in hexane regenerates the parent carbonyl compounds in high yields under relatively mild conditions.
Palladium-Catalysed Cross-Coupling of Organotellurium Compounds with Organoboronic Acids
Authors: Kang Suk-Ku , Hong Young-Taek , Kim Doo-Hwan , Lee Sun-Hwan
Published: December 2009

The palladium-catalysed cross-coupling of diaryl- and divinyl-tellurium dichlorides with organoboronic acids has been accomplished in the presence of PdCl2(PPh3)2 and NaOMe (2 equiv) in DME/H2O (4: 1) at 50 °C in moderate yields.
Heterogeneous Catalysts in the Preparation of 2-Aryl-1,3-Dinitropropanes from β-Nitrostyrenes or Benzaldehydes
Authors: Fierro Angélica , Rezende Marcos Caroli , Sepúlveda-Boza Silvia , Reyes-Parada Miguel , Cassels Bruce K.
Published: December 2009

The use of heterogeneous basic catalysts (KF, NaHCO3) in the preparation of 2-Aryl-1,3-dinitropropanes from β-nitrostyrenes or benzaldehydes is described, with one example followed kinetically by HPLC analysis of aliquots of the reaction.
Oxidation of Aromatic Alcohols and Diols with Peroxodisulfate under Heterogeneous Conditions1+
Authors: Hirano Masao , Kojima Kazuma , Yakabe Shigetaka , Morimoto Takashi
Published: December 2009

A combined use of (NH4)2S2O8 as the terminal oxidant and AgNO3 as the catalyst can effect the oxidation of aromatic alcohols and diols in hexane in the presence of montmorillonite K10 preloaded with a small amount of water, giving the corresponding carbonyl compounds in high yields under relatively mild conditions.
Metal–sulfur chemistry relevant to modelling the active sites of some enzymes of environmental importance
Authors: Evans David J.
Published: December 2009

Recent advances in the synthesis of metal-sulfur complexes may lead to the development of alternative catalysts for use in fuel cell technology.
Synthetic route to 4,5-dihydro-9H-pyrido[1,2-a] thieno[3,2-e]pyrimidine derivatives through 1,3-dipolar cycloaddition
Authors: Santagati Andrea , Granata Giuseppe , Santagati Maria
Published: December 2009

A synthetic route to the title heterocyclic system through 1,3-dipolar cycloaddition of the mesoionic compound 9 with DMAD is described. The structure elucidation of the above system is also reported.
Cyanoacetylurea in Heterocyclic Synthesis: A Simple Synthesis of Heterocyclic Condensed Uracils
Authors: Allam Yehia A. , Swellem Randa H. , Nawwar Galal A. M.
Published: December 2009

The condensation products of cyanoacetylurea with carbonyl compounds were utilized to prepare fused uracils through the intermediate formation of o-aminoureidocarbonyl heterocycles.
Chemoselective dithioacetalisation of carbonyl compounds under solvent-free conditions
Authors: Laskar Dhrubojyoti Dey , Prajapati Dipak , Sandhu Jagir S.
Published: December 2009

Dithioacetalisation of carbonyl compounds in the presence of other structurally different aldehydes and ketones was achieved chemoselectively in the presence of CdI2 under microwave irradiation in solvent free conditions.
Regioselective synthesis of 2-arylimidazo[2,1-a] isoquinolines
Authors: Weixing Qian , Yongzhou Hu
Published: December 2009

Substituted phenacyl bromides react with isoquinoline to form the corresponding quaternary salts which, when heated in ammonium acetate and acetic acid in the presence of Cu(II)O, undergo regioselective cyclisation to give 2-arylimidazo[2,1-a]isoquinolines uniquely.
Access to new Steroids via a (1,2) Wittig Rearrangement
Authors: Stéphan Elie , Dousset Magali , Foy Nicolas , Jaouen Gérard
Published: December 2009

Novel steroids are obtained by reaction of 9,11-dehydro-dibenzylestradiol and dibenzylestradiol with phenyllithium in THF at room temperature.
Synthesis and Crystal Structure of 4,7-bis (2-thienylethynyl)-2,1,3-benzothiadiazole
Authors: Kitamura Chitoshi , Saito Kakuya , Ouchi Mikio , Yoneda Akio , Yamashita Yoshiro
Published: December 2009

4,7-Bis(2-thienylethynyl)-2,1,3-benzothiadiazole was prepared by Sonogashira coupling. The crystal structure showed that one thiophene ring is coplanar and the other is perpendicular to the benzothiadiazole ring.
The Thermodynamics of Tertiary Phosphine Cobalt (III) Schiff Base Complexes
Authors: Asadi Mozaffar , Sarvestani Ali Hossein , Hemateenejad Bahram
Published: December 2009

In this work, the thermodynamics of some other cobalt (III) Schiff base complexes with different ligands and the solvent effect have been examined. Comparison of their properties, spectrally and thermodynamically, aimed to investigate the effects of different electronic and steric situations.
Synthesis, NMR Characterisation, X–ray Crystal Structure and Solution Studies of Ni(II) Complexes of a Pyridine Containing Self–assembling System
Authors: Moghimi A. , Ranjbar M. , Aghabozorg H. , Jalali F. , Shamsipur M. , Chadah Raj K.
Published: December 2009

X-ray analysis of Ni(II) complexes of the self-assembling system LH2, [pyda.H2][pydc] (pydc.H2 = 2,6-pyridinedicarboxylic acid and pyda = 2,6-pyridinediamine), indicated that two six-coordinated anionic [pyda.H]2[Ni(pydc)2].H2O (I) and neutral [Ni(pydc.H)2].3H2O (II) complexes are formed at different temperature conditions in water; in agreement with the results obtained from potentiometric pH titrations in the pH range 3.5–5.5.
[1,2,4]triazolo[1,5-c]quinazolin-2(3H)-ones and their thio analogues: a one pot synthesis†1
Authors: Rajan K. Subramanian , Rao A. Raghu Ram , Mogilaiah K. , Prasad M. Raghu
Published: December 2009

A facile synthetic route for 5-aryl[1,2,4]triazolo[1,5-c]quinazolin-2(3H)-ones and 2(3H)-thiones (3, 4) via 3,1-benzoxazin-4(3H)-ones in good yields under anhydrous conditions has been devised in an effort to develop new bronchodilators for the treatment of asthma.
A Novel Synthesis of α-Thio- and Seleno-Arsonium Ylides via the Mixed Iodonium-Arsonium Ylides
Authors: Deng Guisheng
Published: December 2009

The mixed iodonium-arsonium ylides 3, which were prepared from arsonium ylides 1 and a mixture of PhI(OAc)2 and HBF4, reacted with MYAr (M=H, Na; Y=S, Se) to afford α-arylthio (or arylseleno) arsonium ylides 5.
Oxidative Coupling of Thiols to Disulfides with Iodine in Wet Acetonitrile
Authors: Zeynizadeh Behzad
Published: December 2009

Different types of thiols were oxidatively coupled to their disulfides with iodine in wet acetonitrile at room temperature and in excellent yields.
The Biotransformation of 4-oxa- and 6-oxa-5a-androstan-17-one by Mucor plumbeus
Authors: Al-Fouti Khaled , Hanson James R.
Published: December 2009

Although the title steroids are metabolised by the fungus, Mucor plumbeus, they are not hydroxylated suggesting that the cyclic ether does not facilitate binding to a steroid hydroxylase in this organism.
Synthesis of 4-aryl-butylamine Fluorescent Probes
Authors: Afonso Carlos A. M. , Farinha J. P. S.
Published: December 2009

A short synthesis of the fluorescent probes 4-(9-anthracenyl)butyl amine (three steps), 4-(9-phenanthrenyl)butyl amine (three steps) and 4-(1-pyrenyl)butyl amine (two steps) without chromatographic purification is described.
Hypervalent Intramolecular Coordination in Main Group Chemistry: A Template Synthesis and Crystal Structure of an Ortho-Oximinoarylphosphonium Salt
Authors: Allen David W , Light Mark E , Hursthouse Michael B.
Published: December 2009

The nickel(II)-catalysed reaction of triphenylphosphine with the oxime of ortho-bromoacetophenone gives an ortho-oximinoarylphosphonium salt, which shows a hypervalent intramolecular coordinative interaction between the oximino-nitrogen and the phosphonium centre.
Quinazoline, Pyrazolo[1,5-c]Quinazoline and Spiro Quinazoline Dimers from the Reaction of 2-Aminoacetophenone Hydrazones with Triphosgene
Authors: Alkhathlan H.Z. , Al-Saad M.A. , Al-Hazimi H.M. , Al-Farhan K.A. , Mousa A.A.
Published: December 2009

The reaction of hydrazones of 2-aminoacetophenone with triphosgene in dichloromethane or benzene in the presence of triethylamine gave quinazolines, pyrazolo[1,5-c]quinazoline and spiro quinazoline dimers. The latter compounds are being reported for the first time. In addition, a 4,4-disubstituted quinazoline derivative is prepared and its x-ray crystal structure is reported.