Results 1 to 10 of about 49,832 (253)

Ferrocenoyl-adenines: substituent effects on regioselective acylation [PDF]

Beilstein Journal of Organic Chemistry, 2022
A series of N6-substituted adenine–ferrocene conjugates was prepared and the reaction mechanism underlying the synthesis was explored. The SN2-like reaction between ferrocenoyl chloride and adenine anions is a regioselective process in which the product ...
Mateja Toma, Gabrijel Zubčić, Jasmina Lapić, Senka Djaković, Davor Šakić, Valerije Vrček   +5 more
doaj   +2 more sources

Quantifying Through‐Space Substituent Effects [PDF]

Angewandte Chemie - International Edition, 2020
AbstractThe description of substituents as electron donating or withdrawing leads to a perceived dominance of through‐bond influences. The situation is compounded by the challenge of separating through‐bond and through‐space contributions. Here, we probe the experimental significance of through‐space substituent effects in molecular interactions and ...
Scott L Cockroft, Catherine Adam, Kamila B Muchowska   +2 more
exaly   +5 more sources

Substituent effects in N-acetylated phenylazopyrazole photoswitches [PDF]

Beilstein Journal of Organic Chemistry
Phenylazopyrazole photoswitches proved to be valuable structural motifs for various applications ranging from materials science to medicine. Despite their potential, their structural diversity is still limited and a larger pool of substitution patterns ...
Radek Tovtik, Dennis Marzin, Pia Weigel, Stefano Crespi, Nadja A. Simeth   +4 more
doaj   +2 more sources

Substituent Effects in Tetrel Bonds Involving Aromatic Silane Derivatives: An ab initio Study [PDF]

Molecules, 2023
In this manuscript substituent effects in several silicon tetrel bonding (TtB) complexes were investigated at the RI-MP2/def2-TZVP level of theory. Particularly, we have analysed how the interaction energy is influenced by the electronic nature of the ...
Sergi Burguera, Antonio Frontera, Antonio Bauzá   +2 more
doaj   +2 more sources

Substituent Effects on the Ultraviolet Absorption Properties of 2,4-Dihydroxy Dibenzophenone [PDF]

Molecules, 2022
Substituent effects on the ultraviolet absorption properties of 2,4-dihydroxy dibenzophenone were investigated experimentally. Nine compounds of 2,4-dihydroxy dibenzophenone with different substituents were prepared by a solvent-free reaction of benzoyl ...
Feng Wu, Shengqiong Tan, Zhengjun Fang, Jiyu Deng, Zhengjie He, Chaoyi Huang, Chaktong Au, Bing Yi   +7 more
doaj   +2 more sources

The Nonadiabatic Nature of the Substituent Effects in Azobenzene. [PDF]

Angew Chem Int Ed Engl
ABSTRACT The mechanism of thermal Z → E isomerization in azobenzenes has been debated for nearly a century, with inversion, rotation, and nonadiabatic pathways proposed to account for the nonlinear substituent dependence of the ...
van der Wal JJ, Peshkov RY, Steen JD, Simeth NA, Crespi S.   +4 more
europepmc   +5 more sources

Substituent Effects in the Photophysical and Electrochemical Properties of Meso-Tetraphenylporphyrin Derivatives [PDF]

Molecules
Porphyrins were identified some years ago as a promising, easily accessible, and tunable class of organic photoredox catalysts, but a systematic study on the effect of the electronic nature and of the position of the substituents on both the ground-state
Alexandra Cruz Millheim, Enric Ponzano, Albert Moyano   +2 more
doaj   +2 more sources

13C- and 1H-NMR substituent-induced chemical shifts in N(1)-(4-substituted phenyl)-3-cyano-4,6-dimethyl-2-pyridones [PDF]

Journal of the Serbian Chemical Society, 2008
The 13C- and 1H-NMR chemical shifts of thirteen N(1)-(4-substituted phenyl)-3-cyano-4,6-dimethyl-2-pyridones were measured in deuterated dimethyl sulfoxide (DMSO-d6). The correlation analysis for the substituent-induced chemical shifts (SCS) with sigmap,
BRATISLAV Z. JOVANOVIC, GORDANA G. USCUMLIC, DUSAN Z. MIJIN, NATASA V. VALENTIC, ALEKSANDAR D. MARINKOVIC   +4 more
doaj   +3 more sources

Effect of substituents on the 13C-NMR chemical shifts of 3-methylene-4-substituted-1,4-pentadienes. Part I. [PDF]

Journal of the Serbian Chemical Society, 2003
The principles of linear free energy relationships were applied to the 13C substituent chemical shifts (SCS) of the carbon atoms in the unsaturated chain of 3-methylene-4-substituted-1,4-pentadienes.
IVAN O. JURANIC, ARMIN DE MEIJERE, GORDANA S. USCUMLIC, SERGEI I. KOZHUSHKOV, ZELJKO VITNIK, NATASA V. VALENTIC   +5 more
doaj   +3 more sources

Effects of substituents on the electronic absorption spectra of 3-N-(4-substituted phenyl)-5-carboxy uracils in different solvents. Part II. [PDF]

Journal of the Serbian Chemical Society, 2000
Absorption spectra of some 3-N-(4-substituted phenyl)-5-carboxy uracils, previously determined in twelve solvents, are correlated with substituent sp+ values or by dual substituent parameter correlations involving sl and sR+ values.
M. RADOJKOVIC-VELICKOVIC, G. USCUMLIC, N. VALENTIC   +2 more
doaj   +2 more sources