ÉTARD REACTION: III. NATURE OF THE COMPLEX

1960 ◽  
Vol 38 (11) ◽  
pp. 2136-2142 ◽  
Author(s):  
Owen H. Wheeler
Keyword(s):  
Magnetic Susceptibility ◽  
Reaction Mechanism ◽  
Chloride Complex ◽  
Initial Formation ◽  
Spectroscopic Evidence ◽  
Chromyl Chloride ◽  
Π Complex ◽  
Products Of Reaction

Magnetic susceptibility measurements have shown that the chromium atoms in the toluene–chromyl chloride complex are tetravalent. The structure of the complex and the reaction mechanism are discussed. Spectroscopic evidence has been found of the initial formation of a π-complex. The products of reaction of chromyl chloride and ethylbenzene, isopropylbenzene, tetralin, and indane have been determined.

RELATIVE RATES OF REACTION OF OZONE WITH OLEFINS IN THE VAPOR PHASE

1960 ◽  
Vol 38 (7) ◽  
pp. 1053-1062 ◽  
Author(s):  
T. Vrbaski ◽  
R. J. Cvetanović
Keyword(s):  
Double Bond ◽  
Carbon Atom ◽  
Vapor Phase ◽  
Reaction Products ◽  
Initial Formation ◽  
Inhibiting Effect ◽  
Π Complex ◽  
Olefinic Double Bond

Relative rates of reaction of ozone with a number of olefins in the vapor phase have been determined by the use of the competitive method and GLC analysis of the reaction products. The results indicate a basic electrophilic trend onto which is superimposed a trend due to a partially inhibiting effect of the substituent groups, in particular of those on the more substituted carbon atom of the olefinic double bond. The results are discussed particularly in terms of a two-step addition process, involving an initial formation of an ozone–olefin π-complex and a slower rearrangement of the π-complex into the cyclic "initial ozonide".

Gold-catalyzed [4+1]-annulation reactions between anthranils and 4-methoxy-1,2-dienyl-5-ynes involving a 1,2-allene shift

2019 ◽  
Vol 55 (13) ◽  
pp. 1979-1982 ◽  
Author(s):  
Hsiang-Chu Hsieh ◽  
Kuo-Chen Tan ◽  
Antony Sekar Kulandai Raj ◽  
Rai-Shung Liu
Keyword(s):  
Reaction Mechanism ◽  
Initial Formation

Gold catalyzed [4+1]-annulations of 4-methoxy-1,2-dien-5-ynes with anthranils are described; the reaction mechanism involves initial formation of α-imino gold carbenes, followed by a subsequent 1,2-allene shift.

scholarly journals Spectroscopic Evidence for the Involvement of a Radical Intermediate in the Friedel-Crafts Benzylation Using Ion-Exchanged K10 Catalysts

2018 ◽  
Vol 62 (4) ◽  
Author(s):  
Zoltán Hell ◽  
László Korecz ◽  
Sándor Békássy
Keyword(s):  
Reaction Mechanism ◽  
Aromatic Hydrocarbons ◽  
Benzyl Chloride ◽  
Reaction Path ◽  
Initial Step ◽  
Ionic Mechanism ◽  
Radical Intermediate ◽  
Radical Species ◽  
Spectroscopic Evidence ◽  
Ionic Reaction

For Friedel-Crafts alkylation of aromatic hydrocarbons an ionic reaction path is considered as classical reaction mechanism. The alkylation with benzyl chloride in the presence of ion-exchanged K10 montmorillonite catalysts containing multivalent, reducible cations had an outstanding activity, therefore a radical initial step as a supplement to the ionic mechanism was proposed earlier. We made ESR investigations to clarify the existence and the nature of the suggested radical species. The ESR experiments verified that the reaction involves a radical step.

scholarly journals Etard reactions. I. Nature of complexes and their reactions with some oxygen and nitrogen donor molecules

1968 ◽  
Vol 46 (8) ◽  
pp. 1255-1260 ◽  
Author(s):  
R. C. Makhija ◽  
R. A. Stairs
Keyword(s):  
Magnetic Susceptibility ◽  
Carbon Tetrachloride ◽  
Donor Molecule ◽  
X Ray ◽  
Chromyl Chloride ◽  
Nitrogen Donor

Dilute carbon tetrachloride solutions of chromyl chloride and toluene react to form a product of empirical composition, C6H5CH3•2CrO2Cl2 (1). On refluxing 1 with carbon tetrachloride solutions of pyridine, α-picoline, acetonitrile, dioxan, tetrahydrofuran, and triethylamine, adducts of approximate compositions C6H5CH3•2CrO2Cl2•2D (D = donor molecule) are obtained.Results of magnetic susceptibility, infrared, and preliminary X-ray observations are discussed. Possible structures for 1 and for the ternary adducts are described.

Reactions of Chromyl Chloride with Carboxylic Acids and Carboxylic Acid Anhydrides

1985 ◽  
Vol 40 (2) ◽  
pp. 247-250 ◽  
Author(s):  
Ramesh Kapoor ◽  
Pratibha Kapoor ◽  
Ramneek Sharma
Keyword(s):  
Magnetic Susceptibility ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Magnetic Moment ◽  
Antiferromagnetic Coupling ◽  
Chromyl Chloride ◽  
Polar Organic Solvents ◽  
Uv Visible ◽  
Acid Anhydrides ◽  
Polymeric Structures

Abstract Chromyl Chloride reacts with carboxylic acids [RCOOH where R = C2H5, n-C3H7, CH2CI, CHCl2 and CCI3] to give reduced chromium(III) carboxylates, [Cr3 O(OOCR)6 (H2O)3 ]Cl. Magnetic susceptibility, UV-visible and IR measurements are all consistent with their trinuclear basic structures. Reactions of chromyl chloride with carboxylic acid anhydrides [(RCO)2O where R = CH3 , C2H5 and n-C3H7 ] give dinuclear oxo-bridged complexes of the type, [Cr2O(OOOCR)3 ]Cl. These compounds behave as non-electrolytes in polar organic solvents. IR spectra suggest the presence of bridging carboxylato groups containing Cr-O -Cr chains. Their low magnetic moment values suggest polymeric structures exhibiting antiferromagnetic coupling between Cr atoms.

Arylation of enelactams using TIPSOTf: reaction scope and mechanistic insight

2021 ◽  
Author(s):  
Tomasz J. Idzik ◽  
Zofia M. Myk ◽  
Łukasz Struk ◽  
Magdalena Perużyńska ◽  
Gabriela Maciejewska ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Multinuclear Nmr ◽  
Mechanistic Insight ◽  
Nmr Study ◽  
Wide Range

Triisopropylsilyltrifluoromethanesulfonate can be effectively used for the arylation of a wide range of enelactams. The multinuclear NMR study provided deep insights into the reaction mechanism.

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