scholarly journals electronic effect of substituents: symbols and signs

2008 ◽  
Keyword(s):  
Electronic Effect ◽  
Effect Of Substituents

The effects controlling the oxygen basicity in alkoxysilanes (RO)nSi(CH3)4-n. The mutual polarizability effect of alkoxy groups attached to silicon

1979 ◽  
Vol 44 (3) ◽  
pp. 750-755 ◽  
Author(s):  
Josef Pola ◽  
Marie Jakoubková ◽  
Václav Chvalovský
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Electronic Effect ◽  
Linear Regression Analysis ◽  
Effect Of Substituents ◽  
Relative Basicity ◽  
Polarizability Effect ◽  
Alkoxy Groups ◽  
Individual Series

Relative basicity of the oxygen in alkoxysilanes (RO)nSi(CH3)3-n having n = 1-4 and various electrondonating and electronwithdrawing groups R measured as Δν(OH) of phenol due to its interaction with these compounds in CCl4 is shown to be chiefly controlled by the electronic effect of substituents R. Linear regression analysis of the Δν(OH) vs n relatioship for individual series (RO)nSi(CH3)4-n suggests the operation of the polarizability effect of RO groups becoming more important with increasing electronwithdrawing nature of R.

Structure of aminonitrones and electronic effect of substituents on their acid-base properties

2016 ◽  
Vol 86 (4) ◽  
pp. 806-809 ◽  
Author(s):  
M. V. Il’in ◽  
D. S. Bolotin ◽  
M. Ya. Demakova ◽  
M. S. Avdontseva
Keyword(s):  
Electronic Effect ◽  
Acid Base ◽  
Effect Of Substituents ◽  
Base Properties

Das Allopolarisierungsprinzip und seine Anwendungen, VI [1] Die Alkylierung von Enolatanionen: Polarität und Regioselektivität / The Allopolarization Principle and its Applications, VI [1] The Alkylation of Enolate Anions: Polarity and Regioselectivity

1981 ◽  
Vol 36 (12) ◽  
pp. 1644-1652 ◽  
Author(s):  
Rudolf Gompper ◽  
Hans-Hubert Vogt ◽  
Hans-Ulrich Wagner
Keyword(s):  
Charge Density ◽  
Electronic Effect ◽  
Polar Effect ◽  
Enol Ether ◽  
Effect Of Substituents ◽  
Charge Control ◽  
Alkylation Process ◽  
Methylation Ratio

Abstract The O/C methylation ratio in the reaction of sodium enolates with dimethylsulfate depends on the polar(electronic) effect of substituents. The relative π-charge density Px/y = 1x/1y can be used as a measure for the polarity of ambifunctional anions; in case of enolate anions Po/c = 1o/1c-The change of the regioselectivity Sf = log Qo/Qc in the alkylation of enolates is a function of the change in the polarity Po/c; ⊿Sf = f (⊿Px/y). The polar effect of substituents influences the charge control during the alkylation process via a change of the polarity of the enolate system: The higher the polarity of the anion, the stronger the charge control and the higher the yield of enol ether (O-alkylation).

Electronic effect of substituents on the hydrodesulfurization of ring substituted benzenethiols

1993 ◽  
Vol 79 (1-3) ◽  
pp. 229-242 ◽  
Author(s):  
Kenji Konuma ◽  
Seiichi Takase ◽  
Noriyuki Kameda ◽  
Kunio Itabashi
Keyword(s):  
Electronic Effect ◽  
Effect Of Substituents

Electronic effect of substituents in dimethylethynylalkoxysilanes

1974 ◽  
Vol 23 (4) ◽  
pp. 924-925
Author(s):  
M. G. Voronkov ◽  
N. I. Shergina ◽  
G. A. Gavrilova ◽  
O. G. Yarosh
Keyword(s):  
Electronic Effect ◽  
Effect Of Substituents
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