bluuebunny/crossref_metadata_2025 huggingface dataset:
Medium-sized Cyclophanes. Part 54.1 Bromination of 5-tert-butyl-8-methoxy[2.2]metaparacyclophane-1,9-diene and Dehydrobromination of the Bromine Adduct
Authors: Yamato Takehiko , Noda Kozo
Published: December 2009

Bromination of 5- tert-butyl-8-methoxy[2.2]metaparacyclophane-1,9-diene 1 with bromine affords the cis-adduct to the bridged double bond; when treated with potassium tert-butoxide in refluxing THF, the cis-adduct endo, exo-2 gives a mixture of [2.2]metaparacyclophan-9-ene-1-one (4) and 2-one (5) in 59% yield.
Zn Mediated Transesterification of β-Ketoesters
Authors: Bandgar B.P. , Sadavarte V.S. , Uppalla L.S.
Published: December 2009

Methyl/ethyl β-ketoesters when treated with various alcohols along with catalytic amount of Zn dust in refluxing toluene undergo smooth transesterification.
The Synthesis of Ledgerquinone
Authors: Slamet Riskiono , Wege Dieter
Published: December 2009

Ledgerquinone (1,4-dimethoxy-2,3-methylenedioxyanthracene-9,10-dione), isolated from the callus tissue of Cinchona ledgeriana, has been prepared by intercepting the benzyne, 3,6-dimethoxy-4,5-methylenedioxy-1,2-didehydrobenzene, with the anion of 3-oxo-1,3-dihydroisobenzofuran-1-carbonitrile.
A Convenient One-Pot Synthesis of Thiol Esters from Disulfides using a Zn/AlCl3 system
Authors: Movassagh Barahman , Lakouraj Moslem M. , Fadaei Zahra
Published: December 2009

A novel synthetic procedure for the direct preparation of thiol esters from various disulfides and symmetrical anhydrides using a Zn/AlCl3 system is described.
Nitration of methyl-3-hydroxy- and 5-methyl-3-hydroxy-thiophene-2-carboxylate, and some chemistry of the products
Authors: Barker John M. , Huddleston Patrick R. , Wood Michael L. , Burkitt Simon A.
Published: December 2009

The nitration of methyl-3-hydroxythiophene-2-carboxylate furnishes two products, the lower melting of which was previously thought to be the 4- (3) and the other the 5-isomer (2); these assignments have been reversed on the basis of carbon-13 NMR. data and the revised structures have been confirmed both by O to N acyl migrations and by the preparation of the first examples (20) and (23) of the thieno[3,4-b][1,4]oxazine ring system from derivatives of the 4-nitro isomer.
A facile synthesis of 1,3-diphenyl-4-arylspiro[pyrazoline-5, 3′-flavan-4′-one]
Authors: Manikandan S. , Raghunathan R.
Published: December 2009

Synthesis of a series of novel 1,3-diphenyl-4-arylspiro[pyrazoline–5,3′-flavan-4′-ones] has been accomplished in good yields by the regioselective 1,3-dipolar cycloaddition of diphenylnitrilimine with (E) 3-benzylideneflavan-4-ones.
The synthesis and properties of some novel azo group containing calix[n]arene derivatives
Authors: Deligöz Hasalettin , Çetişli Halil
Published: December 2009

Two different azo derivatives of p-tert-butylcalix[4 and 6]arene 5a, 5b have been synthesised; treatment of the monomers (phenol and p-tert-butyl phenol) with diazonium chloride (3) provided corresponding compounds 4a, 4b.
Cation radical mechanisms — α, β γ - tribenzoyloxylation of 2-allyl-1,4,5-trimethoxybenzene
Authors: Zhao Yu , Li Wei , Zhao Chengxue
Published: December 2009

Threo- and erythro-1-(2,4,5,-trimethoxyphenyl-1,2,3-tri(4-nitro) benzoyloxypropanes were formed in a one-electron transfer reaction between 2-allyl-1,4,5-trimethoxybenzene and 4-nitrobenzoyl peroxide and a mechanism is proposed for this very unusual, subtle reaction.
The Reaction of Dimethyl N-cyanodithioiminocarbonate with Amino- and Oxo-azoles: A New General Synthesis of Methylsulfanylazoloazines
Authors: Elgemeie Galal H. , Sood Soha A.
Published: December 2009

A novel and efficient method for the synthesis of a new variety of methylsulfanylazoloazines by the reaction of dimethyl N-cyanodithioiminocarbonate with diazoles containing amino and active methylene functions. The synthetic potential of the method is demonstrated.
Preparation of an insoluble polymer-supported Mn (III) porphyrin and its use as a new alkene epoxidation and alkane hydroxylation catalyst
Authors: Tangestaninejad S. , Habib M.H. , Mirkhani V. , Moghadam M.
Published: December 2009

An easy and effective method to prepare a new supported Mn(III)-porphyrin by immobilisation of Mn(III)-5,10,15, 20-Tetrakis(p-sulfonatophenyl)porphyrin, [Mn(TPPS)], on poly(4-styrylmethyl)pyridinium chloride (PSMP) is reported. This catalyst was found to be efficient for catalysing alkene epoxidation and alkane hydroxylation with sodium periodate. This new heterogenised metalloporphyrin catalyst is of high stability and reusability.
One-step Beckmann rearrangement from carbonyl compounds and hydroxylamine hydrochloride in Al2O3/CH3SO3H (AMA) as a new reagent
Authors: Sharghi Hashem , Sarvari Mona Hosseini
Published: December 2009

A facile and efficient synthetic procedure, for one-step Beckmann rearrangement of aldehydes and ketones with hydroxylamine hydrochloride and Al2O3/CH3SO3H (AMA) has been developed; cyclohexanone has been converted into ∊-caprolactam in a quantitative yield.
O-Nitroaryldioxolanes for Protection of Pheromones. Study of the Photodelivery of Carbonyl Compounds
Authors: Ceita Luisa , Maiti Amiya K. , Mestres Ramon , Tortajada Amparo
Published: December 2009

o-Nitrophenyldioxolanes 1 to 12 have been prepared and the rate of their photocleavage determined. Steric congestion in the molecule causes a decrease of the reaction rate. The decrease in the rate is especially important in the presence of a nitro group in a second phenyl ring.
New polymer bearing hydroxamic acid chelating resin for binding of heavy metal ions
Authors: Lutfor M.R. , Silong S. , Yunus W.M.Z.W. , Rahman M.Z.A. , Ahmad M. , Haron M.J.
Published: December 2009

A new polymer containing the hydroxamic acid functional group was prepared from poly(methyl acrylate) grafted sago starch and the binding capacities of copper, iron, chromium, nickel, dysprosium, gadolinium and uranium were found excellent; other metal ions have significant sorption capacities.
Ternary interaction between copper(II), imidazolinone herbicides and glycylglycine
Authors: Garribba Eugenio , Micera Giovanni , Chruscinska Elzbieta , Sanna Daniele , Pusino Alba
Published: December 2009

The ternary interaction between CuII, (±)-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-5-ethyl-nicotinic or (±)-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)nicotinic acid and glycylglycine, was studied in aqueous solution.
NMR Evidence for Cationic Behaviour of the Benzotriazole Ring in Novel α-(benzotriazol-1-yl)-N-acylglycines
Authors: Khalaj Ali , Pirali Morteza , Dowlatabadi Reza
Published: December 2009

Spin coupling of a proton to a nitrogen in the benzotriazole ring of novel α-(benzotriazol-1-yl)-N-acylglycines 1–3 revealed the zwitterionic properties of these compounds.
Spectral Analysis of Amide Conformers (s-cisand s-trans) of N-isopropylidenehydrazinocarbonyl Derivatives
Authors: O'Callaghan Conor N. , Brian T. , McMurry H. , O'Brien John E.
Published: December 2009

New N-isopropylidenehydrazinocarbonyl derivatives and other, related compounds display in solution two sets of characteristic NMR signals which are attributable to the presence of s-cis and s-trans conformers; the conformations are established by extensive NMR experiments.
Chaos in a Three-Variable Chemical Reaction Model
Authors: Li Qian Shu , Xu Weiguo
Published: December 2009

A three-variable chemical reaction model that exhibits chaotic behaviour is presented.
Unusual Difference in the Reactivity of Seven-Coordinated Mo(II) and W(II) Carbonyl Complexes, [MI2(CO)3(NCCH3)2] with Derivatised-DPPM, Me3SiN=PPh2CH2PPh2
Authors: Balakrishna M. S. , Panda R. , Priya S. , George P.P.
Published: December 2009

The reaction of [Mo(CO)3I2(NCCH3)2] with a stoichiometric amount of Me3SiN=PPh2CH2PPh2 gives an octahedral complex, [Mo3I(CO)(η2-N=PPh2CH2PPh2)] by the metathetical elimination of Me3SiI. Interestingly, similar reaction of the analogous tungsten complex gives a seven-coordinated complex, [WI2(CO)3(η2-Me3SiN=PPh2CH2PPh2)] which ultimately hydrolyses to give an amide complex, [W(CO)3I2(η2-HN=PPh2CH2PPh2)]. The complexes have been characterised by microanalysis, IR and NMR (1H and 31P) spectroscopic data.
Rapid Synthesis of 1,4-Diaryl Thiosemicarbazides using Microwave Technology
Authors: Li Jian-Ping , Liu Ping , Wang Yu-Lu , Luo Qian-Fu
Published: December 2009

A new and rapid method for the preparation of 1,4-diaryl thiosemicarbazides is reported. Ten 1,4-diaryl thiosemicarbazides have been synthesised in excellent yields (89.8–96.3%). The reaction proves to be extremely simple and highly efficient (in 1.5-5 min).
Aluminium Chloride and Sodium Iodide (AlCl3-NaI): A Versatile Dehydrating Agent
Authors: Konwar Dilip , Boruah Monalisa , Sarmah Gautom Kumar , Bhattacharyya Nayan Kamal , Borthakur Naleen , Goswami Birendra Nath , Boruah Kumar Ranjan
Published: December 2009

AlCl3-Nal is an efficient reagent for dehydration of oximes, amides and the Beckmann rearrangement of ketoximes to anilides; it forms isoquinoline derivatives 8(a–c) by cyclodehydrating amides 7(a–c) in very good yields at room temperature.
Tetraethylammonium Permanganate. A New Selective and Mild Reagent for Deoximation in Solvent-Free Conditions
Authors: Bigdeli Mohammad A. , Nikje Mir. M. Alavi , Heravi Majid M.
Published: December 2009

A variety of oximes are easily and efficiently cleaved in excellent yields by tetraethylammonium permanganate in a solventless system.
Preparation of Optically Active β-Amino Acids from Microbial Polyester Polyhydroxyalkanoates
Authors: Park Sang Hyun , Lee Seung Hwan , Lee Sang Yup
Published: December 2009

An efficient method for the preparation of optically active ethyl β-aminobutyrate from the biopolymer, poly-( R)-(-)-3-hydroxybutyrate (PHB) obtained from bacterial cells has been established using chemical transformations: simple recovery of PHB from bacterial cells followed by acidic alcoholysis, tosylation, nucleophilic substitution by azide, and an indium mediated reduction.
Vicinal Dihydroxylation of Alkenes with Tetradecyltrimethylammonium permanganate and potassium hydroxide in a two phase Solvent System
Authors: Hazra Braja G. , Pore Vandana S. , Chordia Mahendra D. , Bahule Bharat B. , Basu Sourav
Published: December 2009

Vicinal cis-dihydroxylation of alkenes has been carried out in good yields using tetradecyltrimethylammonium permanganate in a two phase solvent system with an inorganic base present from the beginning of the reaction. With benzyltrimethylammonium hydroxide as an organic base in nonaqueous solvent system reasonably good yields of diols are realised.
Samarium Diiodide Mediated Reductive Addition Reaction of 1-(phenylsulfonylmethyl) Benzotriazole and 1-(Benzoyloxymethyl) Benzotriazole to Aldehydes and Ketones
Authors: Li Zhifang , Zhang Yongmin
Published: December 2009

1-(β-hydroxyalkyl) benzotriazoles were prepared via reductive addition reactions of Bt1CH2SO2Ph or Bt1CH2OC(O)Ph with aldehydes and ketones under mild conditions promoted by SmI2.
A Facile and Chemoselective Cleavage of Trityl Ethers by Indium Tribromide
Authors: Yadav J.S. , Reddy B.V.Subba , Srinivas R. , Maiti A.
Published: December 2009

Trityl ethers are chemoselectively deprotected to the corresponding alcohols in high yields by a catalytic amount of indium tribromide in aqueous acetonitrile. The method is compatible with various functional groups such as acetonides, acetates, benzoates, olefins, carbamates, esters and ethers present in the substrate.
Solute–Solvent effects on the Dissociation of Oxalic Acid in Aqueous Mixtures of Ethylene Glycol Solvent at Different Temperatures
Authors: el-Naggar G.A. , el-Batouti M.
Published: December 2009

The dependence of the dissociation constants of oxalic acid on temperature and composition of ethylene glycol–water binary mixtures have been studied. Thermodynamic and extrathermodynamic analysis of the obtained results have been examined. The p K values have been correlated with the dielectric constant of the medium according to Born's electrostatic equation.
Synthesis of 1,5,6,10b-tetrahydroimidazo[2,1-a]isoquinolin-2(3H)-one derivatives and their rearrangement to 2,3,5,6-tetrahydropyrrolo-[2,1-a]isoquinoline-3-carboxamides
Authors: Degutyte Rimgaile , Sackus Algirdas , Berg Ulf
Published: December 2009

Condensation of 10b-methyl-1,5,6,10b-tetrahydroimidazo[2,1- a]isoquinolin-2(3 H)-one with aromatic aldehydes affords 10b-(2-arylethenyl)-1,5,6,10b-tetrahydroimidazo[2,1- a]isoquinolin-2(3 H)-one derivatives, which on heating in ethanol easily transform to 2,3,5,6-tetrahydropyrrolo[2,1- a]isoquinoline-3-carboxamides.
Reactions of Cytosine, Thymine and Uracil toward 2,4,6-trinitro-chlorobenzene
Authors: Boga Carla , Bonamartini Anna C. , Forlani Luciano , Modarelli Vincenzo , Righi Lara , Sgarabotto Paolo
Published: December 2009

The title reactions are an example of direct introduction of an aryl group into DNA bases.
Asymmetric Dihydroxylation of trans-stilbene with a New Chiral Ligand Prepared using dihydrocinchonine and the C2 symmetric chiral trans-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboxylic acid
Authors: Periasamy Mariappan , Ramanathan C. Ramaraj , Kumar Nangunoori Sampath , Thirumalaikumar Muniappan
Published: December 2009

The role of linker chirality on the osmium catalysed asymmetric dihydroxylation of trans-stilbene has been examined using the ligand prepared from the C2 symmetric chiral trans-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboxylic acid 1 and dihydrocinchonine (+)-2. Whereas the ligand prepared using (11 S,12 S)-(-)-1 as linker with dihydrocinchonine gave the diol in 85% ee in the asymmetric dihydroxylation of trans-stilbene, the diol was obtained in 52% ee using the ligand prepared from the (11R,12R)-(+)-1.
Synthesis of Three of the Four Diastereomers of 2-(1′,2′-Isopropylidenedioxyethyl)-3-Methyloxetane from D-Mannitol
Authors: Christlieb Martin , Warren Stuart
Published: December 2009

The synthesis of three highly oxygenated, diastereomeric and optically active oxetanes from D-mannitol is described.
Soft Cleavage of THP Protected Estradiols Mediated by TMSI
Authors: Foy Nicolas , Stéphan Elie , Jaouen Gérard
Published: December 2009

Treatment of 3-tetrahydropyranyloxy-17α-aryl estradiols, dissolved in acetonitrile or acetonitrile/THF/pentane mixture, with trimethylsilyl iodide resulted in the soft deprotection of THP ether in good yields without side dehydratation.
Total Synthesis of Bernumicine and Bernumidine, Two Alkaloids from Berberis Nummularia
Authors: Pinet Sandra , Chavant Pierre Yves , Averbuch-Pouchot Marie-Thérèse , Vallée Yannick
Published: December 2009

Bernumicine and bernumidine are two alkaloids extracted from Berberis nummularia. Their total synthesis has been completed and it has been shown that the configuration of the stereogenic carbon of both is ( R).
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 N–H acid, in the presence of triphenylphosphine leads to stable crystalline phosphorus ylids in excellent yields. Some of these ylid derivatives exist as a mixture of two rotational isomers. Interconversion between these two forms was investigated by variable temperature NMR spectroscopy.
Two New Sesquiterpenes from the Chinese Herb Saussurea Petrovii and their Antibacterial and Antitumor Activity
Authors: Dai Jingqiu , Zhao Chenyang , Wang Yuli , Zhang Qi , Liu Zhong-Li , Zheng Rongliang , Yang Li
Published: December 2009

Two new sesquiterpenes petrovin A (1) and petrovin B (2) have been isolated from Chinese herb Saussurea petro-vii and their structures established by spectroscopic methods. Compounds 1 and 2 showed significant antibacterial and antitumour activity.
A Convenient Synthesis of Azines under Solvent-free Conditions using Microwave Irradiation
Authors: Loghmani-Khouzani Hossein , Sadeghi Majid M. M. , Safari Javad , Abdorrezaie Mohammad S. , Jafarpisheh Masood
Published: December 2009

In an extremely fast method the reaction of hydrazine sulfate with a number of aldehydes and ketones, is accelerated by microwave irradiation under solvent free conditions in the presence of CH3CO2Na/CaCl2 to afford high yields of relevant azines.
Synthesis of a Novel Asymmetrical Octasubstituted Zinc Naphthalocyanine
Authors: Qiu Xiao-Qun , Cheng Gong-Zhen , Wu Cheng-Tai
Published: December 2009

The synthesis and characterization of a novel asymmetrical octasubstituted zinc naphthalocyanine (ZnNc(OR1)6(OR2)2, R1=C4H9, R2=CH2CH2OCH3) made by mixed condensation are described.
Fluorescent Compounds from Reactions of Nitrobenzimidazylbenzisoquinolines from 4-nitronaphthalic Anhydride with Alkylamines
Authors: Alexiou M.S. , Tyman J.H.P.
Published: December 2009

The nitro group in the isomeric condensation products of 4-nitronaphthalic-1,8-anhydride with 1,2-diaminobenzene namely 3-nitro and 4-nitro-7H-benzimidazo[2,1-a]benz[de]isoquinolin-7-one is displaced by reaction with 1-octylamine, to give in the case of the 4-nitro compound the highly fluorescent 4-octylamino derivative. The condensation product from 4,5-dinitronaphthalic-1,8-anhydride and 1,2-diaminobenzene afforded, by nitro group displacement with either 1-butylamine or 1-octylamine, complex mixtures without exhibiting significant fluorescence.
Hypervalent Iodine in Synthesis 68: Palladium-Catalysed Double Carbonylation of Diaryliodonium Salts to give α-keto-amides
Authors: Zhou Tao , Chen Zhen-Chu
Published: December 2009

In the presence of a palladium catalyst and the cocatalyst CuI, several diaryliodonium salts have been converted into α-keto amides on treatment with secondary amines and carbon monoxide in good yield and selectivity under mild reaction conditions.
Synthesis of Tricyclic β-Lactams via Palladium Acetate-Induced Heck Reaction
Authors: Ng Sze Sze , Banik Indrani , Okawa Atsushi , Becker Frederick F. , Banik Bimal K.
Published: December 2009

Synthesis of tricyclic β-lactams via palladium acetate mediated cyclization of the unsaturated bromo β-lactam was accomplished in good yield.
Thermal Cyclisation of β-Hydroxyamides to Oxazolines
Authors: Somanathan Ratnasamy , Aguilar Hugo R. , Rivero Ignacio A. , Aguirre G. , Hellberg Lars H. , Yu Zheng , Thomas Jacquelyn A.
Published: December 2009

Thermal conversion is described of amides derived from erythro and threo ephedrines yields stereospecific oxazolines.
Structural Flexibility in Octahedral Tin(IV) Bischelates: Electronic and Hybridization Effects
Authors: Laavanya Parthasarathi , Selvaraju Radhakrishnan , Thenmozhi Swaminathan , Panchanatheswaran Krishnaswamy
Published: December 2009

PM3 calculations on the bis chelates containing acetylacetonato and dithiocarbamato groups with two monodentate ligands reveal the existence of cis and skew trapezoidal bipyramid( STB) octahedral geometry for these complexes. The calculations also show that the nitrato complexes assume bicapped tetrahedral geometry. Crystallographic investigation on the complex, Br2Sn[S2CN(C2H5)2]2 confirms the cis orientation of the bromine atoms, as predicted by the calculations.
2-Methoxy-5-(2-Bromoethyloxy)-2,5-Dihydrofuran: A Useful Building Block for the Synthesis of Dihydro- and Tetrahydro-Furan Moieties
Authors: Malanga Corrado , Mannucci Serena , Lardicci Luciano
Published: December 2009

New syntheses of structures of biological interest containing the tetrahydro-, dihydro- and furo-furan rings are reported employing simple experimental procedures and mild reaction conditions.
Coordination Chemistry of a Pyrazoline Derived from 2,4-Pentanedione bis(4-Methylthiosemicarbazone). Crystal Structure of the Pyrazoline and Evidence for Metal-Mediated Ring Opening
Authors: Davies Sian C. , Durrant Marcus C. , Hughes David L. , Pezeshk Abbas , Richards Raymond L.
Published: December 2009

The heterocyclic structure of the pyrazoline obtained from reaction of 2,4-pentanedione with 4-methyl-3-thiosemicarbazide has been confirmed by X-ray crystallography. Reactions of the pyrazoline with CuII and ZnII have been probed by EPR and NMR spectroscopies respectively. The results suggest that the pyrazoline undergoes ring-opening back to the bis-thiosemicarbazone upon coordination to the transition metal, accompanied by oxidation of the central methylene group when the reactions are carried out under air.
A Facile Method for the Synthesis of Hepta-O-Acetyl-β-D-lactosyl substituted Benzoates
Authors: Dai Zhiqun , Qu Fanqi , Wu Chengtai , Li Wei
Published: December 2009

Hepta-O-acetyl-β-D-lactosyl substituted benzoates were synthesised by the condensation of acetobromolactose with substituted benzoic acids in DMF at room temperature in the presence of Et3N.
A Convenient Synthesis of Conjugated Acetylenic Ketones by Copper(I)-Catalysis under Microwave Irradiation
Authors: Wang Jin-Xian , Wei Bangguo , Liua Zhanxiang , Yulai Hu , Kang Liqing
Published: December 2009

A rapid and efficient synthesis of conjugated acetylenic ketones is reported involving copper(I)-catalysed aroylation of phenylacetylene with aroyl chloride under microwave irradiation.
Abietane Diterpenes from Rabdosia Serra (Maxim) Hara
Authors: Xiao Chen , Renan Liao , Qinglan Xie
Published: December 2009

Three new abietane diterpenoids which were assigned the structures of 16-hydroxyhorminone, 16-acetoxy horminone, and 6,12,15-trihydroxy-5,8,11,13-abietetriene-7-one were isolated, together with horminone, 16-acetoxy-7-0-acetylhorminone, β-sitosterol, stigmasterol, ursolic acid and palmitic acid from the leaves of Rabdosia serra (maxim) hara.
Hypervalent Iodine in Synthesis 79: Reductive Homocoupling of Diaryliodonium Salts in the Presence of Palladium Catalyst and Indium
Authors: Zhou Tao , Chen Zhen-Chu
Published: December 2009

In the presence of palladium catalyst and indium diaryliodonium salts can undergo reductive homocoupling under mild reaction conditions to give biaryls in excellent yields.
Kinetics and Mechanism of the Oxidative Regeneration of Carbonyl Compounds from Oximes by Cetyltrimethylammonium Permanganate
Authors: Sankhla Rekha , Kothari Seema , Kótai László , Banerji Kalyan K.
Published: December 2009

The oxidative deoximination of several aldo- and keto-oximes by cetyltrimethylammonium permanganate (CTAP), in dichloromethane, proceeding through the formation of a cyclic intermediate, in the rate-determining step, has been proposed.
Synthesis of New 7-Alkylated Theophyllines by Chemical Modification of Dyphylline
Authors: Ashry El Sayed H. El , Rashed Nagwa , Awad Laila F. , Abdel-Rahman Adel A.H. , Rasheed Hanna A.
Published: December 2009

Chemical modification of the propyl side chain of 7-(2,3-dihydroxyprop-1-yl)theophylline led to a variety of hetero-cyclic compounds linked to the theophylline by a methylene group.
Some reactions of bicyclo[6.1.0]non-4-enes and–133 tricyclo[7.1.0.44,6]decanes
Authors: Dehmlow Eckehard Volker , Plückebaum Olaf
Published: December 2009

Synthetic pathways toward the saturated skeleton of tetracyclo[4.4.2.02,10.05,7]dodeca-3,8,11-triene (1) or compounds close to it were probed via derivatives of the title carbon skeletons.
Yellow HgO as an efficient Cyclodesulfurising agent in the Synthesis of 2-substituted Aminobenzoxazoles from N-(2-hydroxyphenyl)-N′-phenylthioureas
Authors: Qian Xuhong , Li Zhibin , Song Gonghua , Li Zhong
Published: December 2009

2-Substituted aminobenzoxazoles 2 were prepared in good yields by cyclodesulfurisation of N-(2-hydroxyphenyl)-N′-phenylthioureas 1 with yellow HgO.
One-pot Synthesis and Dynamic Studies of Stable Dialkyl-2-(1H-Isoindol-1,3(2H)-dione-2-yl)-3-(Triphenylphosphoranylidene) Butanedioate ylides
Authors: Shaabani Ahmad , Safaei Hamid Reza , Hemyari Kiana , Moghimi Abolghasem
Published: December 2009

The title compounds were prepared in high yield by protonation of the reactive 1:1 intermediates produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylate by phthalimide, followed by nucleophilic addition of the imidic nitrogen anion to the vinyl phosphonium salts. A dynamic NMR study was also performed.
Difunctional Heterocycles: A Convenient Synthesis of bis(pyridinyl-2,3-dihydrooxadiazolyl)benzenes
Authors: Elwahy Ahmed H. M. , Ahmed Mohamed M. , El-sadek Mohamed
Published: December 2009

Bis(pyridinyl-2,3-dihydrooxadiazolyl)benzenes 5a-e and 9a, b are obtained in 25-85% yields by heating the corresponding bis(hydrazones) 4a-f and 8a, d in refluxing Ac2O–AcOH for 3–5 h, while the bishydrazones 19 and 17b give 33–54% yields of the phthalazine derivatives 20a, b upon heating in refluxing ethanol containing acetic acid.
Ruthenium (VI) Catalysed Oxidation of Diols by Alkaline Hexacyanoferrate(III) ion – a Kinetic Study
Authors: Behari Kunj , Srivastava Roli , Veena
Published: December 2009

The kinetics of Ru(VI) catalysed oxidation of 1,5 pentane diol; 1,6-hexane-diol, 1-pentanol and 1-hexanol by hexacyanoferrate (III) ion in an aqueous alkaline medium at constant ionic strength shows zero order dependence on hexacyanoferrate (III) and first order dependence on Ru(VI) and substrate. The result suggest that a complex is formed between Ru(VI) and diol, which slowly decomposes to give a reduced form of ruthenium, which is reoxidised to Ru(VI) in a fast step be alkaline hexacyanoferrate(III). A plausible reaction mechanism is proposed.
Benzyltriphenylphosphonium Peroxodisulfate: A Mild and Inexpensive Reagent for Selective Oxidative Deprotection of Trimethylsilyl and Tetrahydropyranyl Ethers, Ethylene Acetals and Ketals under Non-Aqueous and Aprotic Conditions
Authors: Tajbakhsh Mahmood , Mohammadpoor-Baltork Iraj , Ramzanian-Lehmali Farhad
Published: December 2009

Benzyltriphenylphosphonium peroxodisulfate has been found to be an effective reagent for the oxidative deprotection of trimethylsilyl (TMS) and tetrahydropyranyl (THP) ethers, ethylene acetals and ketals to their corresponding carbonyl compounds in excellent yields. Selective oxidative deprotection of TMS ethers in the presence of THP ethers and ethylene acetals (ketals) makes this method a useful and practical procedure in organic synthesis.
Microwave-assisted efficient one-pot synthesis of nitriles in dry media
Authors: Yadav J.S. , Reddy B.V. Subba , Madan Ch.
Published: December 2009

A rapid and efficient procedure is reported for the synthesis of nitriles by condensation of aldehydes with hydroxylamine hydrochloride in the presence of dibutyltin oxide supported on Al2O3 under microwave irradiation
The Crystal Structure of the Molybdenum Complex of [70]Fullerene Mo(ẽ2-C70)(CO)2(Phen)(Dbm) · 2C3H8O · 2.5H2O (Phen = 1,10-Phenanthroline, Dbm = Dibutyl Maleate)
Authors: Cui Peng , Li Lei , Tang Kaluo , Jin Xianglin
Published: December 2009

The molybdenum complex of C70, [Mo(ẽ2-C70)(CO)2(phen)(dbm)] (1) (phen = 1,10-phenanthroline, dbm = dibutyl maleate) has been synthesised by heating a solution of C70 with [Mo(CO)2(phen)(dbm)2] in toluene followed by chromatography over silica gel and the crystal structure has been determined.
Kinetics and Mechanism of Ruthenium (III) Chloride Catalysed Oxidation of Propanol by N-Chloro-P-Toluene Sulfonamide (Chloramine-T) in Aqueous Acid Medium
Authors: Bansal Savita , Gupta Divya , Sharma Indu , Khandelwal C.L. , Sharma P.D.
Published: December 2009

Kinetics of ruthenium (III) chloride catalysed oxidation of propanal has been studied.
Kinetics and Mechanism of the Oxidation of Organic Sulfides by Quinolinium Fluorochromate
Authors: Bhandari Abhinav , Sharma Pradeep K. , Banerji Kalyan K.
Published: December 2009

The oxidation of organic sulfides to corresponding sulfoxides by quinolinium fluorochromate proceeds through a sulfurane intermediate.
Novel Unsymmetrical Tetradentate Schiff Base Complexes of Cobalt (II) and Palladium (II) with N2O2 Donor Sets
Authors: Boghaei Davar M. , Mohebi Sajjad
Published: December 2009

The novel unsymmetrical tetradentate Schiff base complexes of Co(II) and Pd(II) with the general formula M(Sal. Phen. Acac.) and M(Sal. Phen. Naph.), have been synthesised by template and non-template method.
Ab Initio Study of Conformational Properties of (Z,E,Z)-Cyclonona-1,3,5-Triene
Authors: Yavari Issa , Adib Behrooz , Zare K.
Published: December 2009

Ab initio HF/6-31G* and MP2/6-31G*//HF/6-31G* methods were used to calculate the relative energies of the important energy-minimum conformations and transition-state geometries of ( Z,E,Z)-cyclonona-1,3,5-triene; the calculated energy barrier for ring inversion of the twist–chair (C1) conformation is 29.35 kJ/mol, while the barrier for swivelling of the trans double bond through the polymethylene bridge is 59.76 kJ/mol.
A Convenient and Chemoselective Acetylation and Formylation of Alcohols and Phenols Using Acetic Acid and Ethyl Formate in the Presence of Bi(III) Salts
Authors: Mohammadpoor-Baltork Iraj , Khosropour Ahmad Reza , Aliyan Hamid
Published: December 2009

A variety of alcohols are acetylated and formylated efficiently with acetic acid and ethyl formate in the presence of catalytic amounts of Bi(III) salts such as BiCl3, Bi(TFA)3 and Bi(OTf)3. BiCl3 and Bi(OTf)3 are also effective catalysts for acetylation of phenols. All of these catalysts are ineffective in formylation of phenols. Selective acetylation and formylation of alcohols in the presence of phenols is an additional advantage of this procedure.
3-Aryl-3-Hydroxy-2,2,4,4-Tetramethylcyclobutanones and Related Compounds
Authors: Lin Shaw-Tao , Lin Wen-Chung , Yeh Yuen-Han , Lee Chuan-Chen
Published: December 2009

3-aryl-3-hydroxy-2,2,4,4-tetramethylcyclobutanones and 1-aryl-2,2,4-trimethyl-1,3-pentadiones were prepared from arylation of 1,1,3,3-tetramethyl-5,8-dioxapiro [3,4]octan-2-one followed by hydrolysis using THF and HCl respectively.
N-Alkylation of Amines Under Microwave Irradiation: Modified Eschweiler–Clarke Reaction
Authors: Torchy Séverine , Barbry Didier
Published: December 2009

The N-alkylation of hexahydroazepine and benzylamine is performed under microwave irradiation in the presence of formic acid and different aldehydes or ketones. Good yields were obtained with reactive carbonyl compounds.
One-Step Synthesis of Pyridine Derivatives from Malononitrile with Bisarylidenecycloalkanone under Microwave Irradiation
Authors: Zhou Jian-Feng , Tu Shu-Jiang , Feng Jun-Cai
Published: December 2009

Six pyridine derivatives were synthesised by one-step reaction of malononitrile with 2,5-bisarylidenecyclopentanones or 2,6-bisarylidenecyclohexanones in methanol / sodium hydroxide under microwave irradiation in 75~92% yields.
Reaction between Isocyanides and N,N′-Dimethylbarbituric Acid. Synthesis of Push–Pull Olefinic Systems
Authors: Yavari Issa , Hazeri Norollah , Maghsoodlou Malek Taher , Moradi Ashraf
Published: December 2009

Polarised olefinic systems are synthesised from the reaction between alkyl or aryl isocyanides and N,N′-dimethylbarbituric acid in 62–74% yield.
Preparation and chiral discrimination of R-(-)-2-phenylglycinol modified β-cyclodextrin
Authors: Ye Chengfeng , Zhao Yongde , Chang Junbiao , Liu Weimin
Published: December 2009

R-(-)-2-phenylglycinol monomodified β-cyclodextrin (β-CD) was synthesised under microwave irradiation. It displayed high chiral discrimination when it was complexed with amino acids.
Cooxidation of Formic Acid and Oxalic Acid by Chromium(VI) in Aqueous Acid Media: A Kinetic Study
Authors: Das Asim K. , Roy Aparna , Saha Bidyut , Das Mahua
Published: December 2009

The Cr(VI) oxidation of a mixture of formic acid and oxalic acid in aqueous acid media occurs much faster than that of either of the two substrates alone; in the mixture, both substrates undergo oxidation simultaneously in a ternary complex of Cr(VI) through a three-electron transfer step (i.e. Cr(VI) → Cr(III)).
An interesting dihedral angle expansion in a series of monophosphoramides of (R)-(+)-1,1′-binaphthyl-2-2′-diamine
Authors: Shi Min , Sui Wen-Sheng , Chan Albert S.C.
Published: December 2009

The dihedral angle of the two naphthyl rings in the chiral ligands monodiphenylphosphoramide 1, monodiphenyl-thiophosphoramide 2 and monodiphenylselenophosphoramide 3 of (R)-(+)-1,1′-binaphthyl-2-2′-diamine increased by 10° for each step along the series: O, S, Se as demonstrated by X-ray crystal analysis
Synthesis and crystal structures of two new (Te, N,) type hybrid organotellurium ligands
Authors: Singh Ajai K. , Sooriyakumar J. , Kadarkaraisamy M. , Drake J.E. , Hursthouse M.B. , Light M.E. , Butcher R.J.
Published: December 2009

The reaction of N-(2-chloroethyl)benzamide and N-[3-bromopropyl]phthalimide with ArTe- Na+ generated in situ by borohydride reduction of Ar2Te 2, has resulted in N-[2-(4-methoxyphenyltelluro)ethyl] benzamide (L1) and N-[2-(4-methoxyphenyl telluro)propyl] phthalimide (L2) respectively, which are potentially (Te, N)-type ligands. Their NMR (1H and 13C) spectra are characteristic and single crystal structures are solved. The Te-C(alkyl) distance [2.140(8)/2.151(4) Å] is longer than Te-C(aryl) distance [2.107(8)/2.128(5) Å].
Synthesis of new pyrazinomethylviologens and the substituent effect of the nitrogen ylid on their absorption spectra
Authors: Jaung Jae-yun , Fukunishi Koushi , Kim Sung Dong , Jeong Sung Hoon , Kim Sung Hoon
Published: December 2009

Dicyanopyrazinylviologens (4-5) can be prepared by the reaction of 2-bromomethyl-3-phenyl-5,6-dicyanopyrazine with some bipyridines. Their absorption spectra and electronic properties are correlated with their chemical structures.
Difluorinated carbaacyclonucleosides: Synthesis and evaluation of antiviral activity
Authors: Lewis Maureen , De Clercq Erik
Published: December 2009

The synthesis of 4-benzoyloxy-5,5-difluoropentan-1-ol from ethyl difluoroacetate is described; its condensation with pyrimidine bases gave carbaacyclonucleosides. which were evaluated, and found inactive, in a large variety of antiviral assays.
Synthesis and structural analysis of novel supramolecular structures based upon N-(2-pyridyl)-3-pyridinecarboxamide
Authors: Su Xun-Cheng , Zhu Shou-Rong , Lin Hua-Kuan , Leng Xue-Bing , Weng Lin-Hong , Chen Yun-Ti
Published: December 2009

The transition metal Cu(II) and Co(II) complexes based on N-(2-pyridyl)-3-pyridinecarboxamide have been synthesised and characterised and single crystal analysis indicated that the two mononuclear complexes self-assembled into supramolecular architectures through intermolecular hydrogen bonding and π–π stacking interactions in the solid state.
Synthesis of β-lactams and oxazolidines from phenoxyacetic acid and ethanolimines promoted by benzenesulfonyl chloride
Authors: Sharma S.D. , Bhaduri Susmita
Published: December 2009

β-Lactams and oxazolidines have been synthesised by the reaction of phenoxyacetic acid with ethanolimines induced by benzenesulfonyl chloride under mild reaction conditions.
A Series of 7-ω-carboxamidoalkyl-substituted estra-1,3,5(10),6-tetraenes
Authors: Thiemann Thies , Umeno Kuniharu , Inohae Eiko , Imai Masao , Shima Yuji , Mataka Shuntaro
Published: December 2009

A number of 7-ω-carboxamidoalkyl-substituted estra-1,3,5(10),6-tetraenes as potential ligands for the estrogen receptor ERα have been prepared using either a conjugate addition of α,ω-iodoalkanenitriles or a Michael addition to steroidal ketone 3 as the key step.
Synthesis and Inclusion Properties of Novel Host Compounds Derived from Abietic Acid
Authors: Tanaka Koichi , Horino Tomoyuki , Shiro Motoo
Published: December 2009

The novel host compounds, (7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,6,10,10a-decahydro-phenanthren-1-yl)-diphenyl-methanol (2a) and its p-chlorophenyl- (2b) and p-methoxyphenyl- (2c) derivatives, have been synthesised by the Grignard reaction of abietic acid ethyl ester with the corresponding ArMgBr. The host compounds (2a-2c) include various organic compounds by hydrogen bonding between the host and guest compounds.
Palladium-Catalysed Arylation of Butyl Acrylate and Acrylamide with Aryl Iodides in Water
Authors: Zhao Hong , Cai Ming-Zhong , Peng Chun-Yun , Song Cai-Sheng
Published: December 2009

The Heck arylation of butyl acrylate and acrylamide with aryl iodides in the presence of catalytic amounts of palladium acetate and tetra- n-butylammonium bromide in pure water using potassium carbonate as base gave the corresponding substituted ( E)-butyl cinnamates and ( E)-cinnamamides in good yields, respectively.
A Simple and efficient Synthesis of 3,4-Dihydropyrimidin-2-Ones catalysed by Amidosulfonic Acid
Authors: Jin Tongshou , Zhang Suling , Zhang Suyun , Guo Junjie , Li Tongshuang
Published: December 2009

A general and practical route for the synthesis of dihydropyrimidines by the one-pot cyclocondensation of aldehydes, β-ketoesters and urea is described using NH2SO3H as catalyst. Yields and selectivities are significantly better than under classical Biginelli reaction conditions.
Further Studies of Regioselective Alkoxydehalogenation of 2,4-dichloroquinolines, 2,6-dichloropyridine and 2,4-dichloronitrobenzene
Authors: Osborne Alan G. , Dimitrova Galya T. , Galbally Paul , Hughes David D. , Jones Clare , Lipman Anthony L. , Wilstead Nicola
Published: December 2009

A comparison of regioselective (solid sodium alkoxide/toluene) and standard (alcoholic alkoxide solution) alkoxydehalogenation reactions with a series of 2,4-dichloroquinolines and with 2,6-dichloropyridine and 2,4-dichloronitrobenzene, with product analysis by NMR spectroscopy, is reported.
A Facile Route for the Synthesis of Thienopyrimidines
Authors: Prasad M. Raghu , Rao A. Raghuram , Rao P. Shanthan , Rajan K. Subramanian
Published: December 2009

Thieno[2,3-d]pyrimidines have been synthesized by a novel route via thieno[2,3-d]oxazinones which were in turn prepared by a facile single pot method.
Reaction of 1-Azaazulenes with Benzyne
Authors: Abe Noritaka , Mori Makoto , Fujii Hiroyuki
Published: December 2009

The reaction of 2-chloro-1-azaazulene (1a) with the benzyne prepared from (phenyl)[ o-(trimethyl-silyl)phenyl]iodonium triflate with tetrabutylammonium fluoride gave 1-phenyl-1-azaazulen-2(1 H)-one and 8-[2-(2-chloro-1-azaazulen-6-yl)phenyl]-1-azaazulen-2(1 H)-one (5), whereas the reaction of 1a with the benzyne prepared from benzenediazonium-2-carboxylate gave 6,10b-etheno-1-azabenz[e]azulen-2(3 H)-one (11) together with 12.
Tetrahydrofuran Ring Opening with Acyloxyphosphonium Bromide Catalysed by Allylsamarium Bromide: A Novel and Effective Method for the Preparation of 4-Bromobutyl Esters
Authors: Liu Yunkui , Zhang Yongmin
Published: December 2009

A tetrahydrofuran ring can be opened with acyloxyphosphonium bromide generated in situ catalysed by allylsamarium bromide to afford 4-bromobutyl esters under mild conditions in good to excellent yields.
Early Transition Metal Complexes of Polydentate and Macrocyclic Thio- and Seleno-Ethers
Authors: Levason William , Reid Gillian
Published: December 2009

Recent work on the syntheses, structures and properties of complexes of polydentate and macrocyclic thio- and seleno-ether ligands with Groups 3-6 metals in positive oxidation states (≥3) is described.
Synthesis and the Crystal Structure of a Copper(II) Complex Dervied from Novel Tridentate Ligand: An Unexpected One
Authors: Dey Subrata Kumar , Choudhury Chirantan Roy , Dey Sankar Prasad , Dey Dilip Kumar , Mondal Nijhuma , Mahalli S. Ozra Ghodsi , Malik K.M. Abdul , Mitra Samiran
Published: December 2009

A novel tridentate ligand C5H4NCONHCOC5H4N (HL) has been formed by Cannizzaro type reaction of pyridine-2-carboxaldehyde and NaNCO in the presence of copper metal ion and its mononuclear distorted square pyramidal complex [Cu(L)(NCO)(H2O)], 1 has been synthesised and characterised.
Trichloro(Triphenylmethylcyclopentadienyl)Titanium/MAO Catalyst, Catalytic Activities for the Polymerisation of Styrene and Conjugated Diolefins
Authors: Miyazawa Akira
Published: December 2009

The catalyst composed η5-C5H4(CPh3)TiCl3 with methylaluminoxane showed catalytic activity for stereo specific polymerisations of styrene and 1,3-butadiene
Octan-1-ol / Water Partition Coefficients of p-benzo-and p-naphthoquinones corrected for pH effect
Authors: Dayan Franck E.
Published: December 2009

A method was developed to quench the effect of pH on the determination of octan-1-ol / water partition coefficients (kow) of p-benzo- and p-naphthoquinones by using a mildly buffered aqueous phase.
Synthesis and X-ray Crystal Structures of Novel Spiro 1,3-benzoxazine Dimers
Authors: Alkhathlan H.Z. , Al-Saad M.A. , Al-Hazimi H.M. , Al-Farhan K.A. , Mousa A.A.
Published: December 2009

Novel spiro 1,3-benzoxazine dimers are obtained when hydrazones of 2-hydroxyacetophenone are treated with triphosgene. An X-ray crystal structure, and the NMR and mass spectra of these new compounds, are reported and discussed.
Synthesis and Rearrangement Reactions of Dihydrobenzhomobarrelene Derivatives: Influence of Double Bond on Product Distribution
Authors: Menzek Abdullah , Gökmen Melek
Published: December 2009

Distributions of rearrangement products from a dihydrobenzhomobarrelene and the analogous benzyhomobarrelene are different. Isomeric alkenes 18 and 20 have been synthesised.
Structural Studies on Bioactive Compounds. Part 37.1 Suzuki Coupling of Diaminopyrimidines: A New Synthesis of the Antimalarial Drug Pyrimethamine
Authors: Richardson Marianne L. , Stevens Malcolm F.G.
Published: December 2009

Suzuki reactions have been used successfully to effect cross-coupling of 5-halopyrimidines with 4-chlorobenzeneboronic acid and 2,4-diamino-5-(4-chloro-3-halo)-6-ethylpyrimidines with 4-methoxybenzeneboronic acid. The antimalarial drug pyrimethamine has been prepared by coupling 2,4-diamino-6-ethyl-5-iodopyrimidine with 4-chlorobenzeneboronic acid.
A Novel Two-Dimensional Non-Interpenetrating Coordination Polymer [Ag2.5L(NO3)2.5]∞ with three different coordination modes of AgI (L = diquinoxalino[2,3-a:2′,3′-c]phenazine)
Authors: Du Miao , Bu Xian-He , Biradha Kumar , Shionoya Mitsuhiko
Published: December 2009

A novel 2-D AgI neutral infinite framework of a large delocalised system diquinoxalino[2,3-a:2′,3′-c]phenazine (L), [Ag2.5L(NO3)2.5]∞ (1), has been synthesised and structurally determined, in which three kinds of different coordination modes are found for the AgI centers.
A Practical Palladium-Catalysed Heteroannulation of 2-bromobenzaldehyde with Alcohols and Carbon Monoxide Leading to 3-alkoxy-3H-isobenzofuran-1-ones
Authors: Cho Chan Sik , Lim Dong Kwon , Kim Tae-Jeong , Shim Sang Chul
Published: December 2009

2-Bromobenzaldehyde is carbonylatively cyclised with alcohols in the presence of a catalytic amount of PdCl2(PPh3)2/PPh3 together with a base to afford the corresponding 3-alkoxy-3 H-isobenzofuran-1-ones in good yields.
Regioselection in 1,3-Dipolar Cycloadditions of 3-Methylpyridine N-Imide to Aromatic Carbonitriles. Synthesis of 2-Aryl-8-Methyl[1,2,4]Triazolo [1,5-a]Pyridines
Authors: Guolin Zhang , Yongzhou Hu
Published: December 2009

1-Amino-3-methylpyridinium mesitylenesulfonate (3) reacts with aromatic nitriles in the presence of potassium hydroxide, undergoing 1,3-dipolar cycloaddition followed by elimination of H2 to give 2-aryl-8-methyl[1,2,4]triazolo[1,5- a]pyridines as the major products, rather than the 6-methyl isomers.
Asymmetric Synthesis of Chiral δ-lactones using BINAP-ruthenium(II) Complexes Hydrogenation Catalysts
Authors: Li Yanjun , Izumi Taeko
Published: December 2009

Asymmetric hydrogenation of keto-acids was accomplished by catalytic amounts of BINAP-ruthenium complexes to afford the corresponding δ-lactones in high yields. The optical purity of the synthesised δ-lactones was determined by chiralcel (OD) in the 9–56% range.
Synthesis, Characterisation and Antimicrobial Activity of Manganese(II), nickel(II), cobalt(II), Copper(II) and Zinc(II) Complexes of a Binucleating Tetradentate Ligand
Authors: El-Tabl Abdou Saad
Published: December 2009

The binucleating, tetradentate Schiff base ligand (H2L) has been synthesised by condensation of bis-(4-aminophenyl)-methane with salicyladehyde. The resulting metal(II) complexes [metal = Mn||, Ni||, Co||, Cu|| and Zn||] have been characterised by elemental analyses, molar conductances, magnetic moment, IR, UV-vis spectra, thermal analyses (DTA and TGA) and ESR spectra. Antimicrobial activities of the ligand and its metal(II) complexes have been tested against different microorganisms. The electrochemical data of complexes (2), (9) and (10) are discussed.
A Novel Method for the Synthesis of Unsymmetrical Sulfides, Thioesters and β-thioesters
Authors: Tian Fengshou , Zhu Yong Ming , Zhang Songlin , Wang Yulu
Published: December 2009

The S–S bond in disulfides was reduced by the Zn/ZrCl4 system in THF to produce sulfur anions, which react with alkyl halides, α,β-unsaturated esters and acyl chlorides or anhydrides to afford unsymmetrical sulfides, thioesters and β-thioesters, respectively.
The Hydrolytic Reactivities of N-methyl-N-(methylthiomethyl)acetamide and N-acetyl-1,3-thiazolidine: The Influence of the Sulfur Atom
Authors: Chandrasekhar Sosale , Gopalan S. Srinivasa
Published: December 2009

The sulfur atom in the substrates leads to modest enhancements in the titled phenomena: these are essentially derived from favourable enthalpies of activation, the negative entropies of activation possibly indicating a measure of stereoelectronic control.
Free Radical Intervention in the Oxidation of Nicotinamide by Alkaline Permanganate – A Kinetic Study
Authors: Pol P.D. , Mahesh R.T. , Nandibewoor S.T.
Published: December 2009

The reaction proceeds in two different stages. A mechanism is proposed and the constants involved in the mechanism are evaluated. The activation parameters for the slow step were calculated and are discussed.
A Simple and Efficient Method for the Dehydrogenation of Symmetric Hydrazo Compounds with NaNO2/NaHSO4•H2O/SiO2
Authors: Li Xiao-Chuan , Wang Yu-Lu , Wang Jin-Ye
Published: December 2009

In this paper, 18 symmetric hydrazo compounds undergo rapid oxidation to corresponding azo compounds using NaNO2/NaHSO4•H2O/SiO2 as a novel oxidising agent under mild conditions for the first time.
Ab initio Study of Configurations of Cycloundeca-1,2,4,5,7,8,10-heptaene
Authors: Nori-Shargh Davood , Soltani Bita , Jameh-Bozorghi Saeed , Olyai Mohammad-Reza Talei Bavil
Published: December 2009

Ab initio molecular orbital and density function theory (DFT) calculations as used to calculate the structure optimisation and configurational features of cycloundeca-1,2,4,5,7,8,10-heptaene (2) showed that the combination of two allenic units of the same chirality and a unit of opposite chirality yields an enantiomeric Z-isomer pair ( RSR and SRS) of C2 symmetry, which is the most stable configuration.
Synthesis and Reaction of a Chiral Cluster Containing an SRuNiW Core
Authors: Bian Zhi-Guo , Chen Yu-Gang , Yin Yuan-Qi , Sun Jie
Published: December 2009

The new cluster [NiRuW(CO)5(μ3-S)(η5 –C5H5)(η5 –C5H4COCH3)] 2 was isolated from the reaction of [CoRuW(CO)8(μ3-S) (η5 –C5H4COCH3)] 1 with NiCp2. Through the further reaction of cluster 2 with 2,4-dinitrophenylhydrazine, a new cluster [NiRuW(CO)5(μ3-S)(η5 –C5H5)(η5 –C5H4C(NNH-C6H3-2,4-(NO2)2)CH3)] 3 was obtained and the structure of cluster 2 has been established using single crystal X-ray diffraction method.
The Role of the Site Sizes in Hydridation of Laves Phases (C14)
Authors: Boulghallat Mustapha , Jouaiti Ahmed , Gerard Norbert
Published: December 2009

New materials, especially AB2 substituted compounds are able to form reversible hydrides and are good candidates to substitute the cadmium in rechargeable nickel–cadmium batteries. These systems have been the subject of several theoretical and experimental studies, particularly concerning the reaction between hydrogen and the Laves phases(C14) containing zirconium. We have shown previously that the A2B2 site size is the basic criterion which allows manipulation of the characteristic properties (kinetic and thermodynamic) of intermetallic compound hydrides Zr(MxCr1-x)2 with M=Fe, Ni. In order to generalise the validity of our criterion, we have extended our study to other Laves phases (C14) in the literature. The results are found to be in good agreement.
Syntheses and Characterisation of New Rh–Co Mixed-Metal Octahedral Linked Clusters
Authors: Zhu Bao-Hua , Hu Bin , Zhang Yu-Hua , Zhang Wei-Qiang , Yin Yuan-Qi , Sun Jie
Published: December 2009

The new Rh-Co mixed-metal dimer [Rh2Co2(CO)8(μ-CO)2(μ4,η2-HC≡CCH2O-)]2C6H4 4 and trimer [Rh2Co2(CO)8 (μ-CO)2(μ4,η2-HC≡CCH2O-)]3B 5 have been synthesised from reactions between Rh2Co2(CO)12 1 and the appropriate diyne and triyne ligands. The crystal structure of cluster 4 has been determined.