bluuebunny/crossref_metadata_2025 huggingface dataset:
Alkynylsilanes as Convenient Precursors for the Stereoselective Synthesis of (E)-Disubstituted Alkenes
Authors: Zhao Hong , Cai Mingzhong
Published: December 2009

Hydromagnesiation of alkynylsilanes 1 gives (Z)-α-silylvinyl Grignard reagents 2, which are reacted with alkyl iodides or aryl iodides in the presence of CuI or Pd(PPh3)4 catalysts to afford (Z)-1,2-disubstituted vinylsilanes 3 in good yields. Intermediates 3 can undergo a desilylation reaction to give (E)-disubstituted alkenes 4 in high yields.
The Hydroboration of Steroidal Vinyl Halides
Authors: Al-Fouti Khaled , Hanson James R. , Hitchcock Peter B.
Published: December 2009

The hydroboration of 2- and 3-dibromo and dichioromethylene 5α-androstanes has been shown to afford the 2β-and 3α- and 3β-hydroxymethyl-5α-androstanes respectively; a 3-chloro substituent changed both the regio- and stereochemistry of the hydroboration of a 3,5-diene.
Copper-Catalysed Oxidative Homo-Coupling of Terminal Acetylenes on Alumina Assisted by Microwave Irradiation
Authors: Sharifi Ali , Mirzaei Mojtaba , Naimi-Jamal Mohammad Reza
Published: December 2009

A variety of diacetylenes were prepared in a microwave irradiation promoted reaction on alumina in the presence of catalytic amounts of a copper catalyst with up to 90% yields, in short times and under solvent-free conditions.
A Folded Conformation around the Methylene Group in Simple Boc–NH–(CH2)3–NH–Boc: An X-ray Diffraction Study
Authors: Mazumdar Pooja Anjali , Das Amit Kumar , Bertolasi Valerio , Kundu Sandip Kumar , Pramanik Animesh
Published: December 2009

Structural studies on model compounds Boc–NH–(CH2)2–NH–Boc (1) and Boc–NH–(CH2)3–NH–Boc (2) have shown the inherent tendency of the propylene group to adopt a folded conformation, which may help in peptide and peptide nucleic acid (PNA) design.
Synthesis and Molecular Structure of a Head-to-Tail [4+4] Dimer of a Hexa-Substituted Anthracene
Authors: Choi Michael T.M. , Yang Qingchuan , Mak Thomas C.W. , Ng Dennis K.P.
Published: December 2009

Two hexa-substituted anthracenes have been synthesised; the molecular structure of a [4+4] head-to-tail anthracene dimer has also been determined by X-ray diffraction analysis.
Bromination of Tricyclo[6.3.1.02,7]Dodeca-2,4,6,10-Tetraene Derivatives: Electronic and Neighbouring Group Effects on Bromination
Authors: Daştan Arif
Published: December 2009

The bromination reactions of tricyclo[6.3.1.02,7]dodeca-2,4,6,10-tetraene derivatives have been studied and the possible role of a substituent in rearrangements was investigated.
Facile Synthesis of 2,3-Dihydro-2-Aryl-4(1H)-Quinazolinones Promoted by SmI2
Authors: Su Weike , Yang Bibo
Published: December 2009

2,3-Dihydro-2-aryl-4(1H)-quinazolinones were prepared in good yields via reductive cyclisation of o-azidobeneamides with aldehydes and ketones promoted by SmI2 under mild and neutral conditions.
Dioxomolybdenum(VI) Complexes as Catalytic Neutral Esterification Agents
Authors: Nag Purnima , Bohra Rakesh , Mehrotra Ram C.
Published: December 2009

Esterification reactions of carboxylic acids with different alcohols in neutral nonaqueous media have been carried out in excellent yields using catalytic amounts of dioxomolybdenum(VI) complexes of the type [MoO2L2] (where LH = acetylacetone, salicylaldehyde, o-aminophenol, 8-hydroxyquinoline, and 2-acetyl pyridoxime). The reactions of propionic acid with primary, secondary and tertiary alcohols in the presence of catalytic amounts of MoO2(acac)2 result in higher yields of the esters with primary alcohols, compared to those with secondary or tertiary alcohols. The results of the esterification reactions of propionic acid with methanol and tertiary butanol in the presence of different dioxomolybdenum(VI) complexes suggest that the homogeneous catalysts are better than heterogeneous analogues.
Microwave Accelerated Synthesis of Cyclopentadienyl Bis-Phosphine Ruthenium (II) Thiolato Complexes Using Focused Microwave Irradiation
Authors: Kuhnert Nikolai , Danks Timothy N.
Published: December 2009

The synthesis of cyclopentadienyl bis-phosphine ruthenium thiolato complexes of the type [RuCp(dppm)SR] from [RuCp(PPh3)2 Cl] using conventional heating and microwave irradiation using a focused monomode reactor is described and the protocols compared. A considerable decrease of the reaction time is observed under microwave conditions. Yields by both methods are comparable. Functionalities such as esters, carboxylic acids and amides on the thiolato ligands are tolerated under the reaction conditions.
Unusual Aminations with Tetramethylguanidine
Authors: Gabbutt Christopher D. , Heron B. Mark , McCreary Janice M. , Thomas David A.
Published: December 2009

Heating activated halobenzenes with 1,1,3,3-tetramethylguanidine affords mixtures of dimethylaminobenzenes and 2-aryl-1,1,3,3-tetramethylguanidines.
Unsymmetrical Tetradentate Schiff Bases Derived from 2-[(2-2 Amino-Phenylimino)-Methyl]-Phenol and 2-[1-(2-Amino-Phenylimino)-Ethyl]-Phenol
Authors: Boghaei Davar M. , Mohebi Sajjad
Published: December 2009

The novel unsymmetrical, diimino-tetradentate Schiff bases derived from 2-[(2-amino-phenylimino)- methyl]-phenol and 2-[1-(2-amino-phenylimino)-ethyl]-phenol were synthesised and characterised by template and non-template methods.
Nickel (II) Catalysed 1,4- Addition Reactions of Functionalised Organozinc Reagents with Enones
Authors: Yang Danfeng Huang Yihua , Wang Jin-Xian , Hu Yulai
Published: December 2009

An efficient catalytic 1,4 addition reaction of functionalised organozinc reagents with enones has been developed using a nickel complex as catalyst.
A Novel Microwave-Activated Sonogashira Coupling Reaction and Cleavage using Polyethylene Glycol as Phase-Transfer Catalyst and Polymer Support
Authors: Xia Min , Wang Yan-Guang
Published: December 2009

Under microwave-activation polyethylene glycol bound 4-iodobenzoic acid could be readily reacted with various terminal alkynes in excellent yields and purity using polyethylene glycol (PEG) as a solid-liquid phase-transfer catalyst and polymer support; the cleavage could be dramatically accelerated under microwave activation.
Regioselective Synthesis of [1,2,4]Triazolo[3,2-b] [2,4]Benzothiazepin-10(5H)-Ones: A New Heterocyclic Ring System
Authors: Bakavoli Mehdi , Davoodnia Abolghasem , Rahimizadeh Mohammad , Heravi Majid M. , Ghasemzadeh Mitra
Published: December 2009

[1,2,4]Triazolo[3,2-b][2,4]benzothiazepin-10(5H)-ones, members of a novel heterocyclic ring system, are synthesised in a regioselective manner via reaction of unsubstituted or substituted 1,2,4-triazole-3-thiones with 2-chloromethyl-benzoyl chloride in good yields.
Microwave-Assisted Condensation Reactions Exploiting Hexamethylenetetramine as a Catalyst under Solvent-Free Conditions
Authors: Karchgaudhuri Nilay , De Aparna , Mitra Alok Kumar
Published: December 2009

Hexamethylenetetramine has been exploited for the first time successfully as a catalyst for the Doebner reaction and Knoevenagel condensation along with the rate enhancement by microwave irradiation under solvent-free conditions.
Synthesis of Allylic Esters and Ethers Using Polymer-Supported Selenium Bromide
Authors: Sheng Shou-Ri , Huang Xian
Published: December 2009

The treatment of adducts from polymer-supported selenium bromide on olefins with anhydrous carboxylate or alcohol and oxidation of the resulting products afford allylic esters and ethers in good yield and purity.
TiO2/SO42-, An Efficient Catalyst for the Methoxymethylation of Alcohols
Authors: Jin Tong-Shou , Guo Jun-Jie , Yin Ya-Hui , Zhang Su-Ling , Li Tong-Shuang
Published: December 2009

Methoxymethylation of primary and secondary alcohols with dimethoxymethane has afforded the corresponding methoxymethyl ethers in good to high yields in the presence of TiO2/SO42- solid superacid.
Efficient Synthesis of Polyfunctionalised Pyridines by Conjugate Addition of 2-Thienylcarbonyl (Thioacetanilides) to αβ-Unsaturated Nitriles
Authors: Bogdanowicz-Szwed Krystyna , Krasodomska Małgorzata
Published: December 2009

Conjugate addition of 2-thienylcarbonyl(thioacetanilides) (1) to arylmethylenemalononitriles (2) yielded 2-amino-1,4-diaryl-5-(2-thienylcarbonyl)-6-thioxo-1,4,5,6-tetrahydropyridine-3-carbonitriles (4), which when oxidised with HgO gave functionalised 2,6-dioxopiperidines (6), whereas with MCPBA they afforded pyrido[2,1-b]benzothiazole-2-carbonitrile derivatives (7).
Dimethyl Sulfoxide-Promoted Dehydrosulfonylation of 2-Aryl-3-Bromo-1-Methanesulfonyl-2,3-Dihydroquinolin-4(1H)-Ones
Authors: Mphahlele Malose J.
Published: December 2009

The 2-aryl-3-bromo-1-methanesulfonyl-2,3-dihydroquinolin-4(1H)-ones undergo dimethyl sulfoxide (DMSO)-promoted dehydrosulfonylation under reflux at 130–140°C to afford the corresponding 2-aryl-3-bromoquinolin-4(1H)-ones.
Synthesis of new 4-Amino-2,6-Diarylpyrimidine-5-Carbonitriles
Authors: de Melo Sebastião José , dos Santos Leila Cabral , Falcão Emerson Peter da S. , Srivastava Rajendra M. , Luu-Duc C.
Published: December 2009

A facile synthesis of the title compounds 5a–e, from appropriate amidines and benzylidenemalononitriles, is described.
A Controlled and Selective Bromination of Phenols by Benzyltriphenylphosphonium Tribromide
Authors: Hajipour Abdol Reza , Mallakpour Shadpour E. , Imanieh Hossein , Pourmousavi Seied Ali
Published: December 2009

Reactions of phenols with benzyltriphenylphosphonium tribromide in dichloromethane–methanol mixture (2:1) gave mono, di and tri brominated phenols at room temperature with high selectivity and good yields.
Efficient and Practical Solvent-Free Oxidation of Alcohols using Microwave Irradiation
Authors: Mojtahedi Mohammad M. , Sharifi Ali , Kaamyabi Sharif , Saidi Mohammad R.
Published: December 2009

Alcohols are oxidised rapidly to the corresponding carbonyl compounds by montmorillonite KSF or silica supported barium manganate, under solvent-free conditions and microwave irradiation.
A Novel Tandem Reaction of Chalcone with Malononitrile or Ethylcyanoacetate Promoted by Samarium (III) Iodide and Followed by Samarium (II) Iodide
Authors: Ma Yongmin , Zhang Yongmin
Published: December 2009

Michael additions of active methylene compounds (for example: malononitrile, ethylcyanoacetate) to chalcones promoted by SmI3 gave 1,4-adducts which, after intramolecular coupling reactions induced by SmI2, furnished fine yields of cyclic products.
Reductive Amination of Aliphatic Carbonyls using Low–valent Titanium Reagent: A Convenient Route to free Primary Amines
Authors: Rele Shyam , Banerji Asoke , Talukdar Sanjay
Published: December 2009

A simple procedure for reductive amination of aliphatic carbonyls, giving direct access to free primary amines using low–valent titanium (LVT) reagent has been reported.
Preparation of 3-Chloro-1,2-Benzisothiazole 1,1-Dioxide (Pseudo-Saccharyl Chloride)
Authors: Brigas Amadeu F. , Fonseca Custódia S.C. , Johnstone Robert A.W.
Published: December 2009

Reasons are given for the formation of two different products from the chlorination of saccharin with phosphorus pentachloride: initially 2-chlorosulfonylcyanobenzene is formed which, under appropriate conditions, cyclises to give 3-chloro-1,2-benzisothiazole 1,1-dioxide, an important derivatising agent for alcohols.
Synthesis and Binding Properties of Calix[4]Arene Dual Porphyrin Conjugate: Tweezers for DABCO
Authors: Arimura Takashi , Nishioka Takuya , Ide Seiji , Furube Akihiro , Murata Shigeo , Tachiya M.
Published: December 2009

A dual porphyrin system built on a calix[4]arene spacer was prepared and the corresponding Zn(II) complex 4 showed a marked affinity for 1,4-diazobicyclo[2.2.2]octane (DABCO) as compared with other amines.
Preparation of Silver Nanostrings and Dendrites by a Ultraviolet Irradiation Photoreduction Technique at Room Temperature
Authors: Wu Shuang-Ding , Zhu Zhengang , Zhang Zhongping , Zhang Ling
Published: December 2009

Silver nanostrings and beautiful dendritic supramolecular nanostructures of silver nanoparticles have been prepared by a novel ultraviolet irradiation photoreduction technique at room temperature using hydroxyethyl cellulose (HEC) as a protecting agent.
Synthetic Effects on Site Symmetry and Photoluminescence Properties of Eu-Doped ZnS Semiconductor Nanoparticles
Authors: Wang Zhao-Xia , Zhang Lei Z. , Xiong Ying , Tang Guo-Qing , Zhang Gui-Lan , Chen Wen-Ju
Published: December 2009

Eu-doped ZnS semiconductor nanoparticles were successfully prepared by using a new method – single-phase precipitation and solid-state reaction.
Clean-Chemistry Sulfonation of Aromatics
Authors: Corby Brian W. , Gray Anthony D. , Meaney Padraig J. , Falvey Michael J. , Lawrence Gregory P. , Smyth Timothy P.
Published: December 2009

A solution of TFAA/H2SO4 is an atom-efficient liquid-phase system for rapid sulfonation of aromatic structures; H2SO4 is consumed stoichiometrically and the spent trifluoroacetic anhydride (TFAA) is readily recovered as trifluoroacetic acid (TFA) which can be recycled to TFAA.
A Münchnonimine-based Method for the Synthesis of 3,6-diaryl-2(1H)-pyridones
Authors: Burger Sylvain , Monnier-Jobé Karin , Perrin Sandrine , Laude Bernard
Published: December 2009

A new and convenient procedure for the preparation of 3,6-diaryl-2(1 H)-pyridones via 1,3-dipolar cycloaddition of münchnonimines to acrylic esters is described.
Stereoselective Synthesis of 1,3-enynylselenides via Palladium-Catalysed Cross Coupling Reactions
Authors: Cai Ming-Zhong , Peng Chun-Yun , Zhao Hong , Huang Jia-Di
Published: December 2009

( E)-α-Bromovinylselenides undergo a cross coupling reaction with alkynyl Grignard reagents in the presence of tetrakis(triphenylphosphine)palladium(0) in THF at room temperature to afford 1,3-enynylselenides in good yields.
Selective synthesis of conjugated enynes from α-arylalkynols using LiCl-Acidic Al2O3 under solvent-free conditions
Authors: Pourjavadi Ali , Marandi Gholam Bagheri
Published: December 2009

α-Arylalkynols were converted into conjugated enynes (in a selective manner under solvent-free conditions) using the LiCl-acidic Al2O3 couple as catalyst and support.
Enzyme Catalysed Kinetic Resolution of Racemic Methyl 3-acethylbicyclo [2.2.1] hept-5-ene-2-carboxylate using pig's liver esterase†
Authors: Mamaghani Manouchehr , Alizadehnia Alireza
Published: December 2009

Racemic methyl 3- endo-acetylbicyclo[2.2.1]hept-5-ene-2- exo-carboxylate and methyl 3- exo-acetylbicyclo[2.2.1]hept-5-ene-2- endo-carboxylate were prepared (as a 1:1 mixture in 98% yield) from (E)-methyl 4- oxo-2-pentenoate, using Diels–Alder methodology. The mixture was separated chromatographically and resolved into the enantiomers by pig liver esterase (PLE) with low to high ee's (98%).
Highly efficient Synthesis of the Optically Active Sesquiterpene Hydroquinone (+)-Zonarol and the Sesquiterpene Quinone (+)-Zonarone
Authors: Villamizar José , Orcajo Angel L. , Fuentes Juan , Tropper Eleonora , Alonso Randolph
Published: December 2009

A facile synthesis of the sesquiterpene hydroquinone (+)-zonarol 5 and sesquiterpene quinone (+)-zonarone 6 from manool is reported in 7 and 8 steps, respectively.
Highly Efficient Oxidation of Alcohols Catalysed by Nafion-Cerium(IV) or Nafion-Chromium(III)
Authors: Yamato Takehiko , Shinoda Naoki
Published: December 2009

Ce(IV) or Cr(III) impregnated Nafion-K catalyst is found to be effective in promoting the dehydrogenative oxidation of primary and secondary alcohols to aldehydes or ketones with NaBrO3 as a co-oxidant.
Kinetics and Mechanism of the Oxidation of Substituted Benzyl Alcohols by Butyltriphenylphosphonium Dichromate
Authors: Goyal Archana , Kothari Seema , Banerji Kalyan K.
Published: December 2009

The oxidation of substituted benzyl alcohols by butyltriphenylphosphonium dichromate proceeds by a hydride-ion transfer via a diester intermediate.
Two New Sesquiterpenes from the Chinese Herb Halenia Elliptica and their Antibacterial and Antitumour Activity
Authors: Dai Jingqiu , Shi Yanping , Zhao Chenyang , Yang Li , Li Yu
Published: December 2009

Two new sesquiterpenes halenin A (1) and halenin B (2) have been isolated from Chinese herb Halenia elliptica and their structures established by spectrosiopic methods. Compounds 1 and 2 showed significant antibacterial and antitumour activity.
Synthesis and Crystal Structure of Diorganotin(IV) Derivatives Containing the bis(3,5-dimethylpyrazol-1-yl) Acetate Ligand
Authors: Tang Liang-Fu , Zhu Pei-Juan , Wang Ji-Tao
Published: December 2009

Two new diorganotin(IV) derivatives containing the heteroscorpionate ligand have been synthesised by reaction of diphenyltin halides with bis(3,5-dimethylpyrazol-1-yl)acetate lithium and have been characterised by X-ray analysis.
Reexamination of the Symmetry Rule for Bond Distortions in Conjugated Hydrocarbons
Authors: Kataoka Masahiro
Published: December 2009

Pariser–Parr–Pople-type SCF MO calculations with the electron correlation effect given by the Brillouin-Wigner second-order perturbation method with Epstein–Nesbet energy denominators and by the Pople–Seeger–Krishnan correction show that the symmetry rule for bond distortions in conjugated hydrocarbons is effective for predicting the geometrical structures of [4 n+2]annulenes.
Protonation mechanisms of Nickel Complexes Relevant to Industrial and Biological Catalysis
Authors: Henderson Richard A.
Published: December 2009

The sites of protonation and the subsequent rearrangement reactions of simple nickel complexes containing hydride, thiolate and alkyl ligands are reviewed, and the relevance of these reactions to the action of certain nickelbased catalysts are discussed.

Summary

Protonation at the metal and ligand is central to the understanding of how both enzymes and industrial catalysts operate at the molecular level. The recurring theme in studies on the protonation of all metal complexes is that the ultimate residence of the proton is not necessarily the initial binding site, and the movement of proton between sites can occur by a variety of mechanisms. These features are also evident in the reactions of simple nickel complexes and mechanistic studies are revealing the subtle interplay between ligand and metal which are the basis of the kinetic and thermodynamic control of protonation reactions at these sites.
Phosphomolybdic Acid, an Efficient Catalyst for the trimethylsilylation of Alcohols
Authors: Jin Tong-Shou , Li Yan-Wei , Sun Guang , Li Tong-Shuang
Published: December 2009

An easy method for the preparation of trimethylsilyl ethers of alcohols with 1,1,1,3,3,3-hexamethyl- disilazane (HMDS) catalysed by phosphomolybdic acid (PMA) under mild conditions has been carried out in excellent yields.
synthesis of Dialkyl 9-Chloro-3H-Pyrrolo[1,2-A]Indole-2,3-Dicarboxylates Mediated by Vinylphosphonium Salts
Authors: Esmaeili Abbas Ali , Kheybari Hajar
Published: December 2009

The addition of a dialkyl acetylenedicarboxylate to 3-chloroindole-2-carboxaldehyde in the presence of triphenylphosphine leads initially to a vinylphosphonium salt, which undergoes an intramolecular Wittig reaction to produce the title compounds in fairly good yields.
Facile Transfer Hydrogenation of Chromones
Authors: Sabui Subir Kumar , Mondal Pranab , Venkateswaran Ramanathapuram V.
Published: December 2009

Refluxing a solution of chromones in methanol containing ammonium formate and Pd–C leads to facile hydrogenation to chromanones.
The Reaction of Alkyl Isocyanides and Benzylidene Meldrum's Acid Derivatives in the presence of Water: A One-Pot synthesis of 4-(Alkylamino)-3-Aryl-4-Oxobutanoic Acids
Authors: Shaabani Ahmad , Teimouri Mohammad Bagher
Published: December 2009

The reaction between alkyl isocyanides and substituted-benzylidene Meldrum's acid derivatives in the presence of water produces 4-(alkylamino)-3-aryl-4-oxobutanoic acids in good yields.
Hydrolysis of Dipeptide N-Heptyl Esters with Newlase F
Authors: Chen Zhong-Zhou , Li Yan-Mei , Zhao Yu-Fen
Published: December 2009

Newlase F, a crude enzyme containing lipase and protease, can be used in the synthesis of peptide conjugates; the hydrolysis conditions were optimized to increase lipase activity and suppress protease activity and in addition, N-terminal protecting groups and peptide bonds were not affected.
An Efficient Procedure for the Synthesis of Diacetals from the Incl3·4H2O Catalysed Reaction of 2,2-bis (Hydroxymethyl)-1,3-Propanediol witH Aldehydes or Ketones
Authors: Deng Guisheng , Ren Tiegan
Published: December 2009

Diacetals of carbonyl compounds are synthesised in good yields by the InCl3·4H2O catalysed condensation reactions.
Solvent free Oxidation of Thiols by (NH4)2Cr2O7 in the Presence of Mg(HSO4)2 and wet SiO2
Authors: Shirini Farhad , Zolfigol Mohammad Ali , Mallakpour Bahareh , Moha-mmadpour-Baltork Iraj , Mallakpour S.E. , Hajipour A.R.
Published: December 2009

A very simple and mild reaction for the efficient coupling of thiols by ammonium dichromate (ADC) in the presence of Mg(HSO4)2 and wet SiO2, under solvent free conditions, is reported.
A Facile and Efficient Procedure for Deprotection of 1,1-Diacetates Catalysed by H2NSO3H
Authors: Jin Tong-Shou , Li Guang Sun, Yan–Wei , Li Tong-Shuang
Published: December 2009

A rapid, efficient and high yield method of the deprotection of 1,1-diacetates is described which occurs under catalysis of H2NSO3H.
synthesis of Functionalised derivatives of Pentaerythritol
Authors: Ashry E. S. H. El , Kilany Y. El , Hamid H. Abdel , El-Zemity S. R. , Boghdady S.
Published: December 2009

The synthesis of functionalised derivatives of pentaerythritol has been attempted by the reaction of 1 with different aldehydes and nucleophilic reagents; the activity of various derivatives against hepatitis B virus has been studied.
Theoretical Studies on the Configuration of a Chalcanol Derivative
Authors: Terada Yukimasa , Hirata Miyuki , Etoh Hideo , Watanabe Naoharu , Shimizu Hiroshi , Ahmad Mansoor , Tanaka Hitoshi
Published: December 2009

The relative configuration of a naturally occurring monobenzoylated diol was assigned to erythro by comparing the weighted average of calculated 1H NMR coupling constants with the experimental values.
Solid Phase synthesis of Amides Using Mukaiyama'S Reagent
Authors: Tao Bin , Boykin David W.
Published: December 2009

A new solid-phase synthetic method using Mukaiyama's reagent under mild conditions is reported to prepare amides in high purity without purification after cleavage from the resins.
LiClO4-Catalysed C-Alkylation of Pyrrole and Indoles with Aziridines and Epoxides
Authors: Yadav J.S. , Reddy B.V.S. , Parimala G.
Published: December 2009

Aryl- N-tosylaziridines and epoxides smoothly undergo ring-opening with pyrrole and indoles in the presence of 5M lithium perchlorate in diethyl ether (LPDE) at ambient temperature to afford the corresponding 2- and 3-alkylated pyrroles and 3-alkylated indoles in high yields with high selectivity. LiOTf is also found to be an effective catalyst for this transformation.
The reaction of Isocyanides and Dialkyl Acetylenedicarboxylates with Isatoic Anhydride: One-Pot synthesis of Highly Functionalised Ketenimines
Authors: Shaabani Ahmad , Teimouri Mohammad Bagher , Mirzaei Peiman , Bijanzadeh Hamid Reza
Published: December 2009

The addition of isocyanides to dialkyl acetylenedicarboxylates in the presence of isatoic anhydride leading to highly functionalised ketenimines is reported at room temperature.
A Facile Synthesis of Functionalised 3H-Pyrroles Promoted by Magnesium and a Catalytic Amount of Iodine
Authors: Xu Xiaoliang , Zhang Yongmin
Published: December 2009

The intermolecular reductive coupling cyclisation of 3,3-diaryl-2-cyanoacrylonitriles or ethyl 3,3-diaryl-2-cyano-acrylates with aromatic nitriles with magnesium and catalytic iodine in THF afforded 3 H-pyrroles in good yields under neutral and mild conditions.
A Convenient Synthesis of Threo-4-Amino-3, 4-Diphenylbutanoic Acid and Its Derivatives1
Authors: Dryanska Veneta , Pashkuleva Iva , Angelov Verislav
Published: December 2009

Several alkyl threo-4-[(diphenylmethylene)amino]-3,4-diphenylbutanoates (3) were prepared by phase-transfer catalysed reaction of N-(diphenylmethylene)benzylamine and esters of cinnamic acid; acid hydrolysis of 3 affords threo-4-amino-3,4-diphenylbutanoic acid.
TiO2/SO42-, A Convenient and Efficient Catalyst for Desilylation-Acetylation of Trimethylsilyl Ethers with Acetic Anhydride
Authors: Jin Tong-Shou , Li Yan-Wei , Sun Guang , Li Tong-Shuang
Published: December 2009

A rapid method for desilylation-acetylation of trimethylsilyl ethers with acetic anhydride catalysed by TiO2/SO42- at room temperature is reported.
synthesis of Some New Pyridothienopyrimidines and Related [1,2,4]Triazolopyridothienopyrimidines
Authors: Bakhite E.A. , Abdel-Rahman A.E. , Mohamed O.S. , Thabet E.A.
Published: December 2009

4-Chloro-9-phenyl-7-(2-thienyl)pyrido[3′,2′:4,5]thieno[3,2- d]pyrimidine (5) and 3-amino-3,4-dihydro-4-imino-9-phenyl-7-(2-thienyl)pyrido[3′,2′:4,5]thieno[3,2- d]pyrimidine (19) were prepared and employed as precursors for synthesizing the fused-ring compounds of the title.
photochemistry of Substituted Dibenzothiophene S-Oxides and Oxygenated Bis-Dibenzothiophenes
Authors: Kumazoe Kazuya , Arima Kazuya , Mataka Shuntaro , Walton David J. , Thiemann Thies
Published: December 2009

Substituted dibenzothiophene and bis-dibenzothiophene S-oxides were prepared and submitted to photolysis. The rate of deoxygenation of the molecules under photoirradiation was found to be highly dependent on their substitution pattern.
Efficient Methods for Optional metalation of 1-(Methylphenyl)Pyrroles in α or Benzylic Positions
Authors: Faigl Ferenc , Thurner Angelika , Vass Bernadett , Tőke László
Published: December 2009

Novel, selective metalation methods have been described for optional functionalisation of 1-(methylphenyl)pyrroles in α or benzylic positions and an efficient way for dilithiation of the model compounds has also been reported.
Stereoselective synthesis of Substituted Allyl Selenide by the reaction of (E)-3-Selanyl Vinylzirconocene Chloride with Aldehydes Or Acyl Chlorides
Authors: Xie Meihua , Huang Xian
Published: December 2009

A regio- and stereoselective synthesis of substituted allyl selenides is described. Hydrozirconation of propargyl selenides and its further reaction with aldehydes or acyl chlorides afford 4-selanyl allyl alcohols or 4-selanyl-2-en-1-one, respectively.
Synthesis of Neolignans from Anaxagorea Clavata
Authors: Pal Gautam , Venkateswaran Ramanathapuram V.
Published: December 2009

A synthesis of the neolognans (1) and (2) is described employing an intramolecular Wittig cyclisation to generate the 2-arylbenzofuran ring system.
A Kinetic study of Cadmium(Ii) Adsorption on Lewatit Tp260 Resin
Authors: Alguacil Francisco José
Published: December 2009

Cadmium(II) adsorption from aqueous sulphate medium on Lewatit TP260 cationic (di-Na+) ion exchange resin was investigated. The influence of operating variables such as aqueous pH, metal concentration, time and temperature on the equilibrium parameters was studied. Cadmium(II) adsorption on the resin can described by the Langmuir equation, whereas cadmium(II) uptake is particle diffusion controlled. The moving boundary particle diffusion model only fits the initial metal adsorption on the resin.
The biotransformation of the Diterpenoid, Rosenonolactone by Mucor Plumbeus
Authors: Hanson James R. , Hitchcock Peter B. , Pibiri Ivana , Piozzi Franco
Published: December 2009

The biotransformation of rosenonolactone by the fungus, Mucor plumbeus involves hydroxylation at C-2α C-6β C-12α and epoxidation of the Δ15-alkene.
The Preparation and Crystal structure of 16-Acetylandrosta-4,16-Dien-3-One+
Authors: Dalmaris John , Hanson James R. , Hitchcock Peter B. , Kiran Ismail
Published: December 2009

Dehydroisoandrosterone was formylated at C-16 by a Vilsmeier reaction and by condensation with methyl formate. The product of the latter reaction was converted to 16-acetylandrosta-4,16-dien-3-one and its X-ray crystal structure was determined.
Acyl Maleic Hydrazides as Versatile Acyl Transferring Agents
Authors: Mashraqui Sabir H , Shivaji Jadhav L
Published: December 2009

Acyl maleic hydrazides have been found to act as effective acyl transferring agents to substrates containing heteroatom nucleophiles such as amines, phenols, alcohols and thiols under mild and convenient conditions.
The Microbiological Hydroxylation of Des-Ring D Androstanes by Cephalosporium Aphidicola
Authors: Bensasson Caroline , Hanson James R.
Published: December 2009

The hydroxylation of ring B of des-ring D androstanes by Cephalosporium aphidicola follows the pattern of normal steroids, but that of ring C differs from this, suggesting that the nature of ring D is important in determining the hydroxylation of ring C.
Influence of the Solvent on the stereoselectivity of 1,3-Dipolar cycloaddition of Nitrile Oxides on Several 4-Substituted 2-Cyclopentenones
Authors: Adembri Giorgio , Paoli M. Laura , Sega Alessandro
Published: December 2009

The diastereofacial selectivity in 1,3-dipolar cycloadditions of 2,6-dichlorobenzonitrile oxide on 2-cyclopentenones 1–5 is strongly dependent on the solvent when an hydroxyl group is present at C(4) (1–2) while if this group is protected (3–4) or absent (5) the reaction is solvent independent.
A Novel Asymmetric reduction of Nitroolefin 2-Nitro-1-Phenyl-1-Propene by Using BINAP-Ruthenium(II) Complexes
Authors: Li Yanjun , Izumi Taeko
Published: December 2009

The ruthenium BINAP complex, [Ru(OAc)2{(S)-BINAP}], can catalyse the hydrogenation of 2-nitro-1-phenyl-1-propene (1) to give optically active 2-nitro-1-phenylpropane (2) in moderate enantiomeric excess.
Studies on BF3·Et2O-Catalysed Cyclisation of 2-Aryl-1-(2,4,4- Trimethyl-1-Cyclohexen-3-yl)-Ethanone
Authors: Bie Pingyan , Zhang Chenglu , Peng Xuanjia , Chen Bo , Wu Tongxing , Pan Xinfu
Published: December 2009

Cis-fused products were obtained in high yield from the cyclisations of a series of 2-aryl-1-(2,4,4-trimethyl-1-cyclohexen-3-yl)-ethanones bearing electron donating groups with BF3·Et2O as catalyst.
Synthesis and Conformational Analysis of Syn-Dithia[3.3][2,4]Thiazolophane and Syn-Dithia[3.3]([1,4]Phenyl[2,4]Thiazolophane)
Authors: Mashraqui Sabir H. , Kumar Sukeerthi , Nivalkar Kishore R.
Published: December 2009

Synthesis of syn-dithia[3.3][2,4]thiazolophane 1 and syn-dithia[3.3]([1,4]phenyl[2,4]thiazolophane) 2 was accomplished via the stepwise construction of two thiapropylene (CH2SCH2) bridges. Dynamic 1H NMR analysis reveals the heterophanes 1 and 2 to be conformationally mobile on the NMR time scale down to −55 °C.
A Water Based Method for Hydroxymethylation of Phenols and Phenolic Ketones
Authors: Goswami Jonali , Borthakur Naleen , Goswami Amrit
Published: December 2009

A water based eco-friendly method for the hydroxymethylation of phenols and phenolic ketones has in good yield been developed.
1,3-Dipolar cycloadditions of Arylcarbonitrile Oxides and Diaryl Nitrilimines with Some 2-Arylmethylene-1,3-Indanediones; regiochemistry of the Reactions
Authors: Boudriga Sarra , Askri Mohiedinne , Gharbi Rafik , Rammah Mohamed , Ciamala Kabula
Published: December 2009

Ring-closure reaction affording spiroisoxazolines and spiropyrazolines via a 1,3-dipolar cycloaddition between the title compounds, occurs with high regioselectivity.
Esterification of Alkene with Cerium(IV) Sulfate in Carboxylic Acid
Authors: Horiuchi C. Akira , Fukushima Tomoaki , Furuta Noriyuki , Chai Wen , Ji Shun-Jun , Saito Yoshikazu , Hashimoto Chikao , Takahashi T. Tomoyoshi , Sugiyama Takashi , Muto Akinori , Sakata Yusaku , Nozaki Sukekatsu
Published: December 2009

Reaction of alkenes [cyclohexene (1), cycloheptene (2), cyclooctene (3), 1-heptene (4), 1-octene (5), styrene (6), 1,7-octadiene (7), indene (8), and 1,2-dihydronaphthalene (9)] with cerium(IV) sulfate (CS) in carboxylic acids [formic acid, acetic acid, and propionic acid] readily yielded the corresponding carboxylic esters. This addition reaction follows the Markovnikov rule. This reaction provides a new simple method for preparing carboxylic esters from alkenes. It was also found that this method is useful for formylation.
Silica Sulfuric Acid/Kclo3/Wet SiO2 as an Efficient Heterogeneous Method for the Oxidation of Alcohols Under Mild Conditions
Authors: Mirjalili BiBi Fatemeh , Zolfigol Mohammad Ali , Bamoniri Abdolhamid , Zaghaghi Zahra
Published: December 2009

A combination of silica sulfuric acid and potassium chlorate in the presence of wet SiO2 was used as an effective oxidising agent for the oxidation of alcohols to their corresponding aldehyde or ketone derivatives in acetonitrile or toluene with good yields.
Chemical Reactivity of 3-aryl-5-Methyl-1,3,4-Oxadiazolin-2-Ones towards Nitrogen Nucleophiles. Part 1. One-pot Ring Conversion of 3-Aryl-5-Methyl-1,3,4-Oxadiazolin-2-Ones into 4-Amino-2-Aryl-5-Methyl-2,4-Dihydro-3H-1,2,4-Triazol-3-Ones
Authors: Kavali Jyothi R. , Kotresh O. , Badami Bharati V.
Published: December 2009

The ring transformation of 3-aryl-5-methyl-1,3,4-oxadiazolin-2-ones 1a–n into 4-amino-2-aryl-5-methyl-2,4-dihydro-3 H-1,2,4-triazol-3-ones 3a–n, by reaction with hydrazine hydrate, is described. The products were screened for biological activity, and were found to be active against fungal strains.
Magnesium Perchlorate: An Efficient Catalyst for Selective Sulfonylation of Arenes under Neutral Conditions
Authors: Bandgar B. P. , Kamble V. T. , Bavikar S. N.
Published: December 2009

Magnesium perchlorate is found to be an extremely efficient catalyst for the sulfonylation of activated, unactivated and heterocyclic aromatics under almost neutral conditions.
Magnesium-Catalysed Cost Effective and Rapid Reductive Cleavage of Azo Compounds Using Ammonium Formate
Authors: Abiraj K. , Gowda Shankare , Gowda D. Channe
Published: December 2009

Azo compounds, both symmetrically and unsymmetrically substituted, are reduced to the corresponding amine/s with low cost magnesium powder using ammonium formate within 20 minutes.
The Preparation of 21,21-Dimethylprogesterone
Authors: Hanson James R. , Kiran Ismail , Scarbrough Catherine
Published: December 2009

The kinetically controlled alkylation of pregnenolone acetate has been used to prepare the 21,21-dimethyl analogue which was then converted into 21,21-dimethylprogesterone.
Synthesis and Crystal Structures of [Cu{HC(pz)3}(SCN)2] and [Cu(tacn)(SCN)2] (HC(pz)3: Tris(Pyrazolyl)Methane; Tacn: 1,4,7-Triazacyclononane)
Authors: Shen Wei-Zheng , Xie Cheng-Zhi , Cheng Peng , Chen Jiu-Tong , Yan Shi-Ping , Liao Dai-Zheng , Jiang Zong-Hui
Published: December 2009

Two novel copper complexes with formulae [Cu{HC(pz)3}(SCN)2] 1 and [Cu(tacn)(SCN)2] 2 have been obtained by the reaction of HC(pz)3 and tacn with a copper salt and thiocyanate. The complex 1 crystallises in the orthorhombic space group Aba2, with lattice parameters a = 25.7715(7) Å, b = 7.5034(3) Å, c = 16.2328(6) Å, Z = 8, R1 = 0.0613, wR2 = 0.1353. The complex 2 crystallises in the orthorhombic space group P2(1)2(1)2(1), with lattice parameters a = 8.640(4) Å, b = 10.890(5) Å, c = 13.833(6) Å, Z = 4, R1 = 0.0343, wR2 = 0.0679. Both complexes are isostructural mononuclear compounds. The central copper ions of 1 and 2 are coordinated by three nitrogen atoms of the ligands and two nitrogen atoms of the two thiocyanate ions. Depending on the ligands, the two complexes forms different weak bonds resulting in different crystal packing.
Kinetic and Mechanistic Investigation of Oxidative Degradation and Deamination of Atenolol by Diperiodatonickelate(IV) in Aqueous Alkaline Medium
Authors: Mulla R. M. , Kulkarni R. M. , Nandibewoor S. T.
Published: December 2009

A mechanism involving deprotonated diperiodatonickelate(IV) (DPN) as the reactive species of the oxidant has been proposed. The reaction constants involved in the different steps of mechanism are calculated. The activation parameters with respect to slow the step of the mechanism are computed and discussed.
Synthesis of trans-Stilbenes Utilising Decarbonylation of α-Chloro Chloroformates Mediated by Samarium Diiodide
Authors: Li Zhifang , Zhang Yongmin
Published: December 2009

A new synthesis of trans-stilbenes has been achieved by decarbonylation of α-chloro chloroformates mediated by samarium diiodide in THF; this one pot reaction is completed within a few minutes at room temperature.
First Direct Detection of Chromium(IV) as a Long Lived Intermediate in the Oxidation of Methanol by Chromium(VI)
Authors: Ghosh Sanchita P. , Kumar Manjuri , Koley Aditya P. , Ghosh Manik C.
Published: December 2009

Reduction of chromium(VI) by excess methanol in solutions buffered by 2-ethyl-2-hydroxy butanoic acid and its sodium salt proceeds through a 2-electron path to produce pink chromium(IV). With the progress of this reaction, a slow oxidation of the product chromium(IV) by reactant chromium(VI) takes place. When all the chromium(VI) is consumed, the chromium(IV) undergoes very slow disproportionation to chromium(V) and chromium(III). The formation of chromium(IV) is accelerated by both 2-ethyl-2-hydroxy butanoate ion and hydrogen ion.
Aquation of β-Cis-[CoCl2(trien)]+in Water/Aot/n-Heptane Reverse Micelles
Authors: Fusek Frederik , Grancicová Ol'ga , Lath Dieter
Published: December 2009

The aquation of β- cis-[CoCl2(trien)]+ has been studied in reverse micelles of water/AOT/ n-heptane for various concentrations of water and AOT at 298.1 K. The results are discussed in terms of a two-state model of confined water.
A Novel Reductive Cross-Coupling Reaction of N-Aryl-2-Nitrobenzamide and Triethyl Orthoformate Promoted by the TiCl4/Sm System: An Access to 3-Arylquinazolin-4 (3H)-Ones
Authors: Shi Daqing , Rong Liangce , Wang Juxian , Zhuang Qiya , Hu Hongwen
Published: December 2009

A short and facile synthesis of a series of 3-arylquinazolin-4(3H)-ones was accomplished in good yield via the intermolecular reductive coupling reaction of N-aryl-2-nitrobenzamide and triethyl orthoformate promoted by TiCl4/Sm.
Microwave-Promoted Synthesis of β-Hydroxyesters by the Reformatsky Reaction in the Absence of Solvent
Authors: Gholap Atul R. , Chavan Abhijit P.
Published: December 2009

A microwave-promoted Reformatsky reaction of aldehydes and ketones with ethyl bromoacetate, in the absence of solvent, using activated zinc metal and solid NH4Cl afforded the corresponding β-hydroxyesters in good to excellent yields.
Mild and Efficient Method for Reduction of Aldehydes and Ketones with NaBH4 in the Presence of Dowex1-x8
Authors: Zeynizadeh Behzad , Shirini Farhad
Published: December 2009

Various aldehydes and ketones are reduced efficiently to alcohols with NaBH4/Dowex1-x8.
The Synthesis and X-ray Crystal Structure of 6-Bromo-2,4,4-Trimethyl-Cyclohex-2-Enone
Authors: Williams Craig M. , Bernhardt Paul V.
Published: December 2009

Regiospecific bromination of 2,4,4-trimethyl-cyclohex-2-enone was achieved and the X-ray crystal structure of 6-bromo-2,4,4-trimethyl-cyclohex-2-enone is presented.
“Dark” Adsorption Equilibrium Constants of Benzylic Derivatives on TiO2 and Their Implications in the Sensitised Heterogeneous Photooxidation
Authors: Bettoni Marta , Giacco Tiziana Del , Rol Cesare , Sebastiani Giovanni V.
Published: December 2009

The “dark” adsorption equilibrium constants of different series of benzylic derivatives on TiO2 suspended in CH3CN were determined through a Langmuir-type adsorption isotherm. In particular, the similarity of the K values of differently ring substituted α-OH derivatives within the same series confirms the previously suggested preferential adsorption of the hydroxyl group (at the oxygen atom) with respect to the aromatic moiety.
Ab initio Study of Configurational and Conformational Properties of Cyclodeca-1,2,4,6,7,9-Hexaene and Cyclodeca-1,2,4,6,8,9-Hexaene†
Authors: Nori-Shargh Davood , Sarogh-Farahani Nasrin , Jameh-Bozorghi Saeed , Deyhimi Farzad , Olyai Mohammad-Reza Talei Bavil , Ghanizadeh Fatemeh Rozita
Published: December 2009

Ab initio molecular orbital and density functional theory (DFT) calculations, used to calculate the structure optimisation and configurational features of cyclodeca-1,2,4,6,7,9-hexaene (1) and cyclodeca-1,2,4,6,8,9-hexaene (2), showed that the important structures in compound 1 are: RZRZ ( D2 symmetry), RZSZ ( C2h symmetry) and for compound 2 are: RSZZ ( C1 symmetry), RRZZ ( C2 symmetry).
Synthesis of 4-Arylideneisochroman-1,3-Dione under Microwave Irradiation
Authors: Villemin Didier , Bar Nathalie , Khalid Mohamed , Jaffrès Paul-Alain , Santos Jana Sopkova-de Oliveira
Published: December 2009

Homophthalic acid (1) and arylcarboxyaldehydes were condensed to form 4-arylideneisochroman-1,3-dione (3) in acetic anhydride in the presence of ammonium acetate under focused microwave irradiation. The stereochemistry of the products was determined by NMR and by X-ray diffraction of one isomer.
Physicochemical Properties of Vanadium-Containing Montmorillonite in Epoxidation of Allylic Alcohol
Authors: Khedher I. , Ghorbel A. , Tuel A.
Published: December 2009

Vanadium-containing aluminosilicate molecule sieves were observed to exhibit remarkable catalytic activity in oxidation of hydrocarbons, notably epoxidation of allylic alcohol. In this paper, we review the spectroscopic characterisation of framework incorporation and redox behavior of vanadium in both natural montmorillonite and K10. NMR and EPR studies of coordination and oxidation state of vanadium in dried and calcined samples show that vanadium exists mainly in a tetrahedral oxygen coordination as an isolated monomeric state (VO43-) in V-mont and also as dimeric state [O3V-O-VO3]2- in V-K10 case. The vanadium, in both systems, shows redox properties, changing its oxidation state readily between V4+ and V5+. The development of a high surface area in the V-K10 case, provides a well-dispersed vanadium species, which inceases the initial rate compared to the V-mont one. This vanadium species, in highest oxidation state (V), is found to be the catalytic centre in epoxidation of allylic alcohols, according to a heterolytic mechanism via a tert-butylhydroperoxide-vanadium intermediate.
Sodium Metaperiodate Oxidation of Isocarvacrol
Authors: Kamat Shrivallabh P. , D'Souza Asha M. , Paknikar Shashikumar K.
Published: December 2009

Sodium metaperiodate oxidation of isocarvacrol 8, a monoterpene phenol has been found to give hydrothymoquinone 13, a natural product and a ring cleavage product 7-oxo-5-isopropyloct-3-en-2,5-olide 14.
The Stereochemistry of the 1,2-Addition of Grignard Reagents to Some Steroidal Unsaturated Ketones
Authors: Uyanik Cavit , Hanson James R. , Hitchcock Peter B.
Published: December 2009

The stereochemistry of 3β,17β-dihydroxy-3α-ethylandrost-4-ene, 3α,17β-dihydroxy-3β-methylestr-4-ene and 3β-acetoxy-7α,17β-dihydroxy-7β-methylandrost-5-ene, which were obtained by Grignard reactions from the corresponding αβ-unsaturated ketones, have been established by X-ray crystallography.
Chemoenzymatic Synthesis of Primary Alcohols with a 2-Isoxazoline Moiety
Authors: Kurkowska Joanna , Zadrożna Irmina , Rzeźnicka Kamila
Published: December 2009

Racemic 2-isoxazoline-5-carboxylate esters were reduced under mild conditions to form the corresponding primary alcohols. These alcohols were enzymically resolved by acylation with succinic anhydride in the presence of Amano AK lipase.
Guest-Selective Colour and Fluorescence Changes of a Novel Fluorenone-Based Host Compound
Authors: Tanaka Koichi , Asami Masaya , Scott Janet L.
Published: December 2009

A new host compound, 2,7-bis-(3-hydroxy-3,3-diphenyl-prop-1-ynyl)-fluoren-9-one (2), shows guest-selective colour change and fluorescence enhancement upon inclusion complexation in the solid state.
Stereoselective Synthesis of 1,3-Enynylsilanes via Hydromagnesiation Reaction of Alkynylsilanes
Authors: Cai Mingzhong , Hao Wenyan , Zhao Hong , Song Caisheng
Published: December 2009

Hydromagnesiation of alkynylsilanes gives ( Z)-α-silylvinyl Grignard reagents, which are cross-coupled with alkynyl iodides in the presence of tetrakis(triphenylphosphine)palladium(0) catalyst to afford stereoselectively 1,3-enynylsilanes in good yields.
An Expeditious and Solvent-Free Route to the Synthesis of 2-Substituted Quinazolin-4(3H)-Ones Under Microwave Conditions
Authors: Rad-Moghadam Kurosh , Mohseni Mehdi
Published: December 2009

Ammonium acetate condenses with benzoxazinones (4b–e) or a mixture of anthranilic acid and orthoesters in the absence of solvent to produce the title compounds in a few minutes.
Ab initio Conformational Analysis of Glutamic Acid, Chemical Shift Anisotropy and Population Studies
Authors: Monajjemi M. , Azad M.T. , Haeri H.H. , Zare K. , Hamedani Sh.
Published: December 2009

We report on glutamic acid rotation and its stable conformer in gas phase. The calculations were performed by HF/6-31G* and B3lyp/6-31G* levels of theory. There is a pertubation in the population diagram of the C3 that shows nucleophilic or radical attack will probably occur at this site. This fact is confirmed by the charge distribution and CSA (chemical shift anisotropy) diagrams. The energies and the relative energies are given as a function of rotational angle. Also, low and high-energy barriers of N-H rotation computed at various level of theory have been obtained. Vibrational frequencies of the structure were done to verify the minima of the energy.
Access to Unsymmetrical 1,2-Diketone Intermediates via Benzeneseleninic Anhydride-Promoted Oxidation: Application to Indolone-N-Oxide Synthesis
Authors: Boyer Jérémie , Bernardes-Génisson Vania , Nepveu Françoise
Published: December 2009

1,2-Dicarbonyl compounds employed as key-intermediates in indolone-N-oxide synthesis were prepared by direct oxidation of aryl, aryl- and aryl, alkyl-substituted alkenes assisted by benzeneseleninic anhydride.
Infrared and Raman Spectra of Bis(Melaminium) Sulfate Dihydrate
Authors: Marchewka M.K.
Published: December 2009

Room temperature powder infrared and Raman measurements for the new melaminium salt, bis(2,4,6-triamino-1,3,5-triazin-1-ium) sulfate dihydrate, 2C3H7N6+·SO42-·2H2O, in the crystalline state, were carried out. The vibrational spectra in the region of internal vibrations of the ions corroborate recent X-ray data of Janczak et al. Some spectral features of this new crystal are referred to those of other crystalline melaminium salts.
One-Pot Synthesis of 2-Alkyl/Arylamino-4-oxo-4H-1-Benzopyran-3-Carboxaldehyde from 4-oxo-4H-1-Benzopyran-3-Carboxaldehyde
Authors: Bandyopadhyay Chandrakanta , Sur Kumar Ranabir , Patra Ranjan , Banerjee Subhabrata
Published: December 2009

Zn/NH4Cl–mediated reactions of aldehyde 1 with nitro compounds 2 afford 2-( N-alkyl/arylamino)-3-formylchromones 4, which on heating with 70% H2SO4 produces 9a-d and 11e-h from 4a-d and 4e-h, respectively.
Photochemical Synthesis and Antimicrobial Activity of Dihydrobenzofuranols from 2-Alkoxy Substituted Benzophenones and Ethyl-2-Aroyl Aryloxy Acetates1
Authors: Khanum Shaukath Ara , Shashikanth S. , Sudha B. S. , Sriharsha S. N.
Published: December 2009

Upon UV irradiation 2-alkoxy substituted benzophenones 2a–f and ethyl-2-aroyl aryloxy acetates 7a–c, in acetonitrile under went intramolecular δ hydrogen abstraction and led to synthesis of solely dihydrobenzofuranols 6a–f and 11a–c in excellent yield with potent antimicrobial activity.
Efficient Synthesis of 4,4-Dimethyl-1,9,10(1H)-Anthracenetrione
Authors: Crawley Matthew L. , Hein Karl J. , Markgraf J. Hodge
Published: December 2009

A concise route to the title compound was achieved via annulation of 4,4-dimethylcyclohexenone with 3-cyanophthalide, followed by oxidation with DDQ.
Reductive Cleavage of the Sulfur–Sulfur Bond by the Samarium/Cp2TiCl2 Used for the Synthesis of S-Phenyl Thiolesters
Authors: Jia Xueshun , Zhang Yongmin
Published: December 2009

A mild method is reported for the reductive cleavage of the sulfur–sulfur bond by the samarium/Cp2TiCl2 system to give a phenylthiolate anion species which reacts with acyl chlorides to give the corresponding S-phenyl thiolesters in good yields.
Synthesis of a Pentaerythritol Derivative Bearing Azo Functions
Authors: Lemercier G. , Alexandre M. , Mulatier J.-C. , Andraud C.
Published: December 2009

A convenient strategy for synthesis of a pentaerythritol derivative diacetal containing azo functions is presented; NMR data are discussed and are in good agreement with the molecular structure.