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Acylation Reactions (acylation + reaction)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Unusual Acylation Reaction of 1,-Alkyl-1,,4,-dihydro-2,3,-biquinolines.

CHEMINFORM, Issue 45 2006
D. A. Kovalev
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

ChemInform Abstract: About the Path of Acylation Reaction of 5,5-Dimethylhydantoin with Acetic Anhydride.

CHEMINFORM, Issue 31 2001
G. V. Bazanova
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]

,2 -1,2-Diazetines: Regioselective Acylation Reactions and Rearrangement into 4H-1,3,4-Oxadiazines.

CHEMINFORM, Issue 22 2006
J. Fleischhauer
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

ChemInform Abstract: Lewis Acid Catalyzed Acylation Reactions: Scope and Limitations.

CHEMINFORM, Issue 29 2002
Kusum L. Chandra
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]

ChemInform Abstract: Tin-Free Radical Acylation Reactions with Methanesulfonyl Oxime Ether.

CHEMINFORM, Issue 41 2001
Sunggak Kim
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]

A remarkable difference in the deprotonation steps of the Friedel,Crafts acylation and alkylation reactions

JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 11 2009
Shinichi Yamabe
Abstract Friedel,Crafts acylation and alkylation reactions were investigated using density functional theory calculations. The reaction systems studied were (benzene,+,acetyl chloride,+,Al2Cl6 (or AlCl3)) and (benzene,+,2-chloropropane,+,Al2Cl6). In the acylation reaction, the acylium ion intermediate is reached either via a MeC(Cl)OAl2Cl6 complex or via direct Cl transfer: MeC(O)ClAl2Cl6,,,MeCO,+Al2Cl. The ion adds to benzene electrophilically to form a Wheland intermediate containing a strong CHCl hydrogen bond, which leads to deprotonation and the subsequent formation of acetophenone. The resulting HClAl2Cl6 fragment is subjected to a nucleophilic attack by the carbonyl oxygen of the acetophenone, and recovery of the Al2Cl6 bridge is unlikely. Attack of the Al2Cl6 moiety by MeC(Cl)O gives the complex MeC(Cl)O,AlCl3, whose reactivity toward acylation is similar to that of the MeC(Cl)O,Al2Cl6 complex. In the alkylation reaction, deprotonation does not take place, but rather a [1,2] H-shift from the Wheland intermediate. The resulting , -protonated cumene undergoes deprotonation, with subsequent recovery of the Al2Cl6 bridge. In addition, the Al2Cl6 -catalyzed isomerization of the n -propyl to the isopropyl cation was found to be a dyotropic shift. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Chemo- and Enzyme-Catalyzed Reactions Revealing a Common Temperature-Dependent Dynamic Solvent Effect on Enantioselectivity

HELVETICA CHIMICA ACTA, Issue 11 2003
Gianfranco Cainelli
The enantiomeric ratio E of enzyme-catalyzed (Candida antarctica lipase and lipase PS) and chemo-catalyzed (L -proline-based diamines) acylation reactions of 1-(naphthalen-2-yl)ethanol, 2-phenylpropanol, and 2-benzylpropane-1,3-diol is dependent on solvent and temperature. Plots of ln,E vs. 1/T showed the presence of inversion temperatures (Tinv). The Tinv values for the bio-catalyzed and the chemo-catalyzed reactions are fairly in agreement, and correspond as well to the TNMR values obtained by variable-temperature 13C-NMR experiments on the substrates in the same solvent of the resolution. This result demonstrates that clustering effects in the substrate solvation manage the chemical and the enzymatic enantioselectivity, and, moreover, that the solutesolvent cluster is always the real reacting species in solution for chemical as well as for enzymatic reactions. [source]