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Thermal Rearrangement (thermal + rearrangement)

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Chemistry100%

Selected Abstracts

Thermal Rearrangement of 2,5-Bis(dicyanomethylene)bicyclo[4.2.0]oct-7-ene and 2,5-Bis(dicyanomethylene)bicyclo[4.2.0]octa-3,7-diene.

CHEMINFORM, Issue 1 2004
-octa-, 6-Bis(dicyanomethylene)bicyclo[3.3.0]octa-1(5)-ene, 7-diene, New Electron Acceptors., Unexpected Formation of
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Thermal Rearrangement of ,-(,-Azidoalkyl) Enones.

CHEMINFORM, Issue 44 2002
Gary A. Molander
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: Synthesis of Pyrimidine-Anellated Heterocycles: Thermal Rearrangement of 1,3-Dimethyl-5-(prop-2-enylthio)pyrimidine-2,4-diones.

CHEMINFORM, Issue 2 2002
K. C. Majumdar
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Thermal Rearrangements of Monoterpenes and Monoterpenoids

HELVETICA CHIMICA ACTA, Issue 9 2009
Achim Stolle
Abstract The thermal conversions of monoterpenes and monoterpenoids are an interesting field of research with respect to mechanistic, kinetic, and theoretical issues. Since the beginning of the 20th century, these reactions have attracted the interest of many research groups, and even today there are sufficient problems and questions to deal with. This review covers the thermal isomerization chemistry of pinanes, pinenes, carenes, and thujenes over the past 70 years. Categorization of these compounds into groups, each of them being represented by a small parent molecule (cyclobutane, vinylcyclobutane, vinylcyclopropane), allows systematization of multitude of publications. [source]

ChemInform Abstract: Successful Thermal Rearrangements of Acrylenamides to Give Tetrahydro-2-pyridones under FVT Conditions.

CHEMINFORM, Issue 34 2002
Stanislaw Lesniak
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Theoretical investigation of ion pair SN2 reactions of alkali isothiocyanates with alkyl halides.

INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Issue 1 2005
Part 1.
Abstract The gas-phase ionic SN2 reactions NCS - + CH3F and ion pair SN2 reaction LiNCS + CH3F with inversion mechanism were investigated at the level of MP2(full)/6-311+G**//HF/6-311+G**. Both of them involve the reactants complex, inversion transition state, and products complex. There are two possible reaction pathways in the ionic SN2 reaction but four reaction pathways in the ion pair SN2 reaction. Our results indicate that the introduction of lithium significantly lower the reaction barrier and make the ion pair displacement reaction more facile. For both ionic and ion pair reaction, methyl thiocyanate is predicted to be the major product, but the latter is more selective. More-stable methyl isothiocyanate can be prepared by thermal rearrangement of methyl thiocyanate. The theoretical predictions are consistent with the known experimental results. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2005 [source]

Microwave-Assisted Dimroth Rearrangement of Thiazines to Dihydropyrimidinethiones: Synthetic and Mechanistic Aspects

MOLECULAR INFORMATICS, Issue 5-6 2006

Abstract The Dimroth rearrangement of a set of substituted 2-amino-6H -1,3-thiazines into 3,4-dihydropyrimidine-2-thiones was investigated. The rearrangements were carried out under microwave irradiation conditions in batch or continuous flow format, employing either toluene or 1-methyl-2-pyrrolidone as solvent. Thiazines bearing an ester group at the C5 position rearranged at a considerably higher temperature than derivatives without substituents at this position into the corresponding pyrimidinethiones. This strictly thermal rearrangement was studied in detail using differential scanning calorimetry and density functional theory computational methods. The reaction pathway involves a zwitterionic intermediate. [source]