Oxidative coupling of phenols. Part 9. The role of steric effects in the oxidation of methyl-substituted phenols

1983 ◽  
pp. 581 ◽  
Author(s):  
David R. Armstrong ◽  
Colin Cameron ◽  
Derek C. Nonhebel ◽  
Peter G. Perkins
Keyword(s):  
Oxidative Coupling ◽  
Steric Effects ◽  
Substituted Phenols

The role of initiation in oxidative coupling of methane

1995 ◽  
Vol 127 (1-2) ◽  
pp. 51-63 ◽  
Author(s):  
V.I. Vedeneev ◽  
O.V. Krylov ◽  
V.S. Arutyunov ◽  
V.Ya. Basevich ◽  
M.Ya. Goldenberg ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane

The antifungal factors in barley. IV. Isolation, structure, and synthesis of the hordatines

1967 ◽  
Vol 45 (15) ◽  
pp. 1745-1760 ◽  
Author(s):  
A. Stoessl
Keyword(s):  
Oxidative Coupling ◽  
Degradation Products ◽  
Spectroscopic Studies

Careful fractionation of extracts prepared from barley coleoptiles gave small amounts of pure hordatines A and B and substantial amounts of a mixture of their glucosides. The structures of the hordatines were deduced by degradative and spectroscopic studies and by the synthesis of some degradation products. A synthesis of racemic hordatine A analogous to its probable biogenesis was achieved by the oxidative coupling of coumaroylagmatine.The possible role of the hordatines in lignification is briefly discussed.

Steric Effects in the Electronic Spectra of the 3,5-Diarylaminobenzene Derivatives

1986 ◽  
Vol 41 (11) ◽  
pp. 1311-1314 ◽  
Author(s):  
A. Balter ◽  
W. Nowak ◽  
P. Milart ◽  
J. Sepioł
Keyword(s):  
Excited State ◽  
Electronic Spectra ◽  
Fluorescence Properties ◽  
Steric Effects ◽  
Quantum Yields ◽  
Spectroscopic Behaviour ◽  
Fluorescence Quantum Yields ◽  
Excited State Lifetimes ◽  
Methyl Phenyl

Absorption and fluorescence properties, excited state lifetimes and fluorescence quantum yields were determined for a series of 3,5-diarylaminobenzene derivatives in solvents of different polarities. The role of the nitrile, methyl, phenyl and naphthyl substituents is discussed. Especially the steric effects on the spectroscopic behaviour of the investigated molecules are studied.

Investigation of the role of the Na2WO4/Mn/SiO2 catalyst composition in the oxidative coupling of methane by chemical looping experiments

2018 ◽  
Vol 360 ◽  
pp. 102-117 ◽  
Author(s):  
Vinzenz Fleischer ◽  
Ulla Simon ◽  
Samira Parishan ◽  
Maria Gracia Colmenares ◽  
Oliver Görke ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
Chemical Looping ◽  
Catalyst Composition

Electrophilic additions to allenes. VI. The role of steric versus electronic effects in the reactions of arenesulphenyl halides with allenes

1980 ◽  
Vol 58 (24) ◽  
pp. 2737-2744 ◽  
Author(s):  
Dennis G. Garrattz ◽  
Pierre L. Beaulieu
Keyword(s):  
Positive Charge ◽  
Steric Effects ◽  
Rate Data ◽  
Electronic Effects ◽  
Rate Determining Step ◽  
Minimal Importance ◽  
Electrophilic Additions

The role of steric and electronic effects during the rate and product determining steps for the addition of arenesulphenyl chlorides to 1,3-disubstituted allenes has been briefly examined. Both effects appear to be generally of minimal importance during the rate determining step. The available rate data indicate the presence of little, if any, build up of positive charge on sulphur. These results are interpreted in terms of an SN2 attack on bivalent sulphur leading to an alkylidenethiiranium ion intermediate. Steric effects are of greater importance in the product determining step, particularly when the sulphenyl chlorides possess two bulky ortho substituents, as in the case of 2,4,6-triisopropylbenzenesulphenyl chloride.

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