Top Research Papers on Organic Chemistry

A physical organic chemist wants to understand the detailed sequence of bond makings and bond breakings by which new or well-known reactions take place, and to identify any metastable intermediates involved.

Services and resources recommended for Chemistry Recommended resources for Organic Chemistry

Mechanistic aspects of the isomerization of Z-vinylic tellurides double bonds in the synthesis of potassium Z-vinyltrifluoroborate salts Abstract Through direct transmetalation reaction of Z-vinylic tellurides with nBuLi was observed the unexpected isomerization of double bonds leading to potassium E-vinyltrifluoroborates salts in low to moderate yields. Using EPR spin trapping experiments the radical species that promoted the stereoinversion of Z-vinylic organometallic species during the preparation of potassium vinyltrifluoroborate salts was identified. The experiments support the proposed m...

The zwitterionic aza-Claisen rearrangement proved to be an effective and competitive complement to asymmetric electrophilic fluorination strategies and provides access to versatile synthetic intermediates with fluorine at the stereogenic centre.

Prerequisites It is very convenient for the student to review the general concepts acquired in the first year subject Fonaments de Química. In particular, the part that refers to chemical and acid-base equilibrium. Minimum knowledge of organic formulation and nomenclature is necessary. Remember that it is a face-to-face subject where part of the assessment will be carried out in class hours (theory and / or problems). For this reason, it is highly recommended not to be enrolled in other subjects that overlap the hours scheduled to this subject.

Prerequisites It is very convenient for the student to review the general concepts acquired in the first year subject Fonaments de Química. In particular, the part that refers to chemical and acid-base equilibrium. Minimum knowledge of organic nomenclature is necessary. Remember that it is a face-to-face subject where part of the assessment will be carried out in class hours (theory and / or problems). For this reason, it is highly recommended not to be enrolled in other subjects that overlap the hours scheduled to this subject.

The study of organic reactions includes the chemical synthesis of natural products, drugs, and polymers, and study of individual organic molecules in the laboratory and via theoretical (in silico) study.

bonding. The study of structure determines their chemical composition and formula and the study of properties includes physical and chemical properties, and evaluation of chemical reactivity to understand their behavior. The study of organic reactions includes the chemical synthesis of natural products, drugs, and polymers, and study of individual organic molecules in the laboratory and via theoretical (in silico) study.

Carbonyl group forms the secondary overlapping with C-2 and C-3 of diene, giving the more stable endo product.

The study of organic reactions includes the chemical synthesis of natural products, drugs, and polymers, and study of individual organic molecules in the laboratory and via theoretical (in silico) study.

It is my view that the unity and consistently critical attitude of Ivy's book make his the more generally useful book of reference.

There is enough on diagnosis and treatment to make the reader a competent dermatologist, and specialists will profit from much of the author's advice, so obviously based on personal experience.

DR. TAYLOR has established a reputation as a writer both of text–books and more popular works on science, end he is thus able to put a little more feeling into his descriptive organic chemistry than is customary—some of the compounds seem to have life and uses and to be something more than colourless crystalline compounds having the formulas indicated. It is a task to get all organic chemistry into 500 pages; the same number of specialized monographs would scarcely do it. Yet something has to be provided to enable the student to beat the examiner. The book has a biological bias as is to–day pr...

It will be found a valuable reference book upon many questions pertaining to economic and commercial aspects of tropical plants, however, the book is often defective, in speaking of the growth of Cannabis sativa for its opium-like drug.

To carry out micro-teaching in organic chemistry experiment effectively,green chemistry experimental teaching were realized by changing the types and amounts of chemistry reagent,the process conditions and the use of highly efficient catalyst.Little by-product was produced,which realized the target of waste zero-discharge,and improved the utilization atom.

Organic Chemistry of Macromolecules covers the preparation, reactions, and properties of high molecular weight polymeric materials of both natural and synthetic origin. As a part of this course, U-M students collaboratively created and edited Wikipedia articles.

The importance of green chemistry in experiments of organic chemistry was discussed and some ideas regarding to greenization of experiments in organic chemistry were given.

Safety quizzes: Two Safety Quizzes will be given on the date indicated in the laboratory schedule. You will prepare for these quizzes by reading the packets, Safety in the Chemistry Laboratory and Organic Safety. You must get a satisfactory score on each safety quiz, which may be done by scoring at least 90%. If you do not receive a satisfactory score on either Safety quiz, you will be allowed to retake the quiz once, at a place and time arranged by your instructor. If you do not get a satisfactory score when you retake the quiz you will receive an F grade for the laboratory portion of the cou...

Green chemistry, belonging to the 21st century science, is the frontier of international chemistry research. The necessities of strengthening green chemistry education in teaching of organic chemistry are expounded. The author's practice and exploration about green chemistry education in teaching,experiments,and students,graduation project(thesis) have been introduced. The view of carrying the idea of green chemistry throughout the education process of organic chemistry is put forward in order to cultivate the student'sgreening thinking habit and make them meet the needs of our society in the ...

ion reaction A chemical reaction, the main feature of which is the bimolecular removal of an atom (neutral or charged) from a molecular entity. For example, CH3COCH3 + CH3CO2—+(CH2COCH3) + CH3CO2H (proton abstraction from acetone)

Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgement, with full reference to the source along with use of the copyright symbol q, the name IUPAC and the year of publication are prominently visible. Publication of a translation into another language is subject to the additional condition of prior approval from the relevant IUPAC National Adhering Organization.

The aim of this study was to investigate the effects of organic chemistry anxiety on sophomore undergraduate students in relation to chemistry attitude and organic chemistry achievement. The participants were 228 sophomore undergraduate students, enrolled in organic chemistry courses. Anxiety and attitude were measured using O-CAS and CAS, respectively. O-CA was measured by determining a point total for each student, using the results of exams and quizzes from organic chemistry courses. The results of an ANOVA showed a significant difference in the means for O-CA and chemistry attitudes scores...

Our previous research showed that the rates for unimolecular thermal fragmentation of the O−N bond of organic nitrates are the same in air as they are under a nitrogen atmosphere. This is contrary to what literature studies have reported. When the rate of reaction was followed by infrared (IR) spectroscopy, as in previous literature studies, the IR absorption of the unsaturated carbonyls generated during the reaction complicated the IR analysis and the rates deceptively appeared to slow in air. The current study shows that unsaturated carbonyls can also be formed under a nitrogen atmosphere wh...

The objective of our research was to measure accurate rate constants for the thermal, unimolecular decomposition of organic nitrates. Our research confirms that the rate-determining step is homolytic cleavage of the weak O−N bond to form alkoxy radical and NO2, but the rate constants reported in the past are incorrect. The alkoxy radical and NO2 engage in secondary reactions that ultimately generate stable products such as carbonyl and nitro compounds. Infrared spectroscopy (IR) and gas chromatography/mass spectrometry (GC/MS) were used to monitor the time dependent loss of organic nitrate and...

BACKGROUND L-proline is a natural amino acid having secondary amine functionality and acts as a bifunctional catalyst (organo-catalyst). The amino-functional group acts as Lewis base type while carboxylic acids act as Bronsted acid type catalysts. It catalyzed different asymmetric syntheses including some known name reactions such as Aldol condensation, Mannich reaction, Michael Addition, Knoevenagel condensation, Hantzsch synthesis, OXA-Michael Henry tandem, Ullmann reactions, Wieland-Miescher ketone synthesis, Robinson annulation, Biginelli reaction, α-amination. It is also an important cata...

The usual way of applying heat to a chemical reaction is the use of a Bunsen burner, an oil or some other type of bath, or an electric heater. In inorganic chemistry, microwave technology has been used since the late 1970s while it has been implemented in organic chemistry since the mid-1980s. Microwave heating has been used in the food industry for almost fifty years. The shorter reaction times and expanded reaction range that is offered by microwave technology are suited to the increased demands in industry. For example, there is a requirement in the pharmaceutical industry for a higher numb...

CONTENTS Introduction Ultraviolet and Visible Spectroscopy Nature of Electronic Transitions Principles of Absorption Spectroscopy Spectral Measurements Solvent Effects Applications of Electron Spectroscopy Commercial Applications of UV and Visible Spectroscopy Infrared Absorption Spectroscopy Hooke’s law and Absorption of Radiations Modes of Molecular Vibrations Other Factors influencing Vibrational Frequencies Sample Preparation Characteristic Group Vibrations of Organic Molecules

Variable temperature NMR studies, undertaken to enable the resolution of signals for the equilibrating valence tautomers revealed interesting shifts in the equilibrium of the norcaradiene-cycloheptatriene-NCD-CHT equilibrium.

The mechanism of the chemodosimetric behavior of the probe has been attributed to a Hg 2+ induced transformation of a weakly uorescent dithiocarbamate to a highly uorescent isothiocyanate which has been characterized by a number of spectroscopic techniques and a crystal structure.

The invitation to organic chemistry is universally compatible with any devices to read and is available in the authors' book collection an online access to it is set as public so you can download it instantly.

The potent antitumor agent phorboxazole A was synthesized from six subunits comprising C1-C2 (115), C3-C8 (98), C9-C19 (74), C20-C32 (52), C33-C41 (84) and C42-C46 (85). Tetrahydropyrans B and C containing cis-2,6-disubstitution were fabricated via palladium(II)-mediated intramolecular alkoxycarbonylation which, in the case of tetrahydropyran C, was carried out with catalytic palladium(II) and p-benzoquinone as the stoichiometric re-oxidant. Tetrahydropyran D was obtained by a 10

This course is designed to provide the lectures on the recent research fields of organic chemistry towards those who already finished to learn basic textbooks such as Jones, McMurry, Solomons, Vollhardt-Schore, Wade, etc. Fundamentals and topics in the organic reactions, structural and physical organic chemistry, bio-organic chemistry and the related science and technologies will be described by the faculty members of department of chemistry.

A Textbook of organic chemistry , A Textbook of organic chemistry , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

SULFUR BONDING. INTRODUCTION. PROPERTIES OF SULFUR BONDS. PARTICIPATION OF 3D ORBITALS IN SULFUR BONDING. BONDING IN TRI- AND TETRACOORDINATE SULFUR. WHY ARE "a-DISULFOXIDES" SO UNSTABLE? s-SULFURANE-HYPERVALENCY. HYPERVALENT INTERACTIONS. THE STEREOELECTRONIC EFFECTS OF SULFUR GROUPS. INTRODUCTION. DICOORDINATE SULFUR GROUPS. Electron-Releasing Conjugative Effects. Electron-Sharing Conjugative Effects. Electron-Accepting Conjugative Effects. TRICOORDINATE AND TETRACOORDINATE SULFUR GROUPS. NEIGHBORING GROUP EFFECTS OF SULFUR GROUPS. Dicoordinate Sulfur Groups. Sulfoxides. STEREOCHEMISTRY. INT...

Organic chemistry a textbook , Organic chemistry a textbook , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

Partial table of contents: CHART ANALYSIS. Charts: Forecasting Tool or Folklore? Trends. Trading Ranges. Chart Patterns. Is Chart Analysis Still Valid? Setting Objectives and Other Position Exit Criteria. Linking Contracts for Long-Term Chart Analysis: Nearest Versus Continuous Futures. REAL-WORLD CHART ANALYSIS. Real-World Chart Analysis. OSCILLATORS AND CYCLES. Cycle Analysis of the Futures Markets (R. Mogey & J. Schwager). TRADING SYSTEMS AND PERFORMANCE MEASUREMENT. Examples of Original Trading Systems. Testing and Optimizing Trading Systems. PRACTICAL TRADING GUIDELINES. Eighty-Two Tradin...

It is noted that, more than a decade after the first artificial self-replicators were described, a discipline that deals with complexity in artificial chemical systems is beginning to take shape, under the name of Systems Chemistry.

Introduction to Organic Chemistry, 5th Edition provides an introduction to organic chemistry for students who require the fundamentals of organic chemistry as a requirement for their major. It is most suited for a one semester organic chemistry course. In an attempt to highlight the relevance of the material to students, the authors place a strong emphasis on showing the interrelationship between organic chemistry and other areas of science, particularly the biological and health sciences. The text illustrates the use of organic chemistry as a tool in these sciences; it also stresses the organ...

Novel 3 ’,5, and 5 ’ ,5 ’ -pyrophos-phorothiolate-linked dinucleoside cap analogues were prepared and hydrolytic desilylation and phosphate coupling were conducted in one-pot using liquid-assisted grinding in a vibration ball mill.

Beugungsverfahren:

Abstract

Presents a group approach to the organic laboratory modeled after the modern industrial laboratory.

Rearrangements of "Carbanions".- Complex eliminations eliminations with rearrangements.- Polycyclic anions: From doubly to highly charged ?-conjugated systems.- Methods of analysis of the relative hydrophobicity of biological solutes.

It is shown that a triazole ring can replace adenine without compromising the potency of AdA and provide facile routes to novel AdA analogs.

Preface to the First Edition Preface to the Second Edition Introduction Safety First Abbreviations and Proprietary Names CATEGORIES OF REDUCTIONS Catalytic Hydrogenation Reduction with Hydrides and Complex Hydrides Electroreduction and Reductions with Metals Reductions with Metal Compounds Reductions with Nonmetal Compounds REDUCTION OF SPECIFIC TYPES OF ORGANIC COMPOUNDS Reduction of Hydrocarbons and Aromatic Heterocycles Reduction of Halogen Derivatives of Hydrocarbons and Basic Heterocycles Reduction of Nitro, Nitroso, Diazo, and Azido Derivatives of Hydrocarbons and Basic Heterocycles Redu...

In this short book author tried to cover important organic chemistry topics like types of organic reactions, aromaticity, stereochemistry, heterocyclic chemistry, organic reaction mechanism.

The adaptation of currently available laser capabilities to chemical studies is an important phase of the current laser development, and this suggests the possibility of a new dimension in photochemical experimentation.

An Introduction to Organic Chemistry and its Compounds: Aldehydes and Ketones and Carboxylic Acids and Their Derivatives.

On-bead high-throughput screening of a medium-sized (1000 – 2000 Da) branched peptide boronic acid (BPBA) library consisting of 46 656 unique sequences against HIV-1 RRE RNA generated peptides with binding a ffi nities in the low micromolar range. In particular, BPBA1 had a K d of 1.4 µM with RRE IIB, preference for RNA over DNA (27 fold), and selectivity of up to >75 fold against a panel of RRE IIB variants. Structure – activity studies suggest that the boronic acid moiety and “ branching ” in peptides are key structural features for e ffi cient binding and selectivity for the folded RNA target. ...

A recently identi fi ed Antarctic fi sh protein termed antifreeze potentiating protein (AFPP) is thought to act as an adjunct to the previously characterised antifreeze glycoproteins (AFGPs), the two acting together to inhibit ice crystal growth in vivo . Elucidating the functional properties of the new AFPP requires access to large amounts of pure product, but the paucity of natural material necessitates alternative approaches. We therefore embarked on the total chemical synthesis of the AFPP, through a convergent ligation strategy. After many challenges, mostly due to the solubility issues of ...