Enantioselective Alkynylation Reactions to Substituted Benzaldehyde and Salicylaldehyde Derivatives: The Effect of Substituents upon the Efficiency and Enantioselectivity.

ChemInform ◽  
2007 ◽  
Vol 38 (39) ◽  
Author(s):  
Elizabeth Tyrrell ◽  
Kibur Hunie Tesfa ◽  
Alastair Mann ◽  
Kuldip Singh
Keyword(s):  
Effect Of Substituents ◽  
Salicylaldehyde Derivatives

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.

The Effect of Substituents on the Fluorescent Properties ofPara-Phenylenevinylene

2007 ◽  
Vol 54 (4) ◽  
pp. 853-860 ◽  
Author(s):  
Liang Ding ◽  
Yu-Qi Ding ◽  
Qi-Wen Teng ◽  
Ke Wang
Keyword(s):  
Fluorescent Properties ◽  
Effect Of Substituents
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