Relationship between structure of cation and electron-donor ability in substituted alkylammonium iodides

1973 ◽  
Vol 14 (2) ◽  
pp. 330-331
Author(s):  
Yu. G. Frolov ◽  
V. V. Sergievskii
Keyword(s):  
Electron Donor ◽  
Donor Ability ◽  
Electron Donor Ability

Application of the Variable Oxygen Probe to Determine the π-Electron Donor Ability of the Alkyne Group

2014 ◽  
Vol 67 (12) ◽  
pp. 1866 ◽  
Author(s):  
Benjamin L. Harris ◽  
Jonathan M. White
Keyword(s):  
Low Temperature ◽  
Electron Donor ◽  
Oxygen Probe ◽  
X Ray ◽  
X Ray Crystallography ◽  
Donor Ability ◽  
Structural Database ◽  
Derivatives Of ◽  
Electron Demand ◽  
Electron Donor Ability

Eight ester and ether derivatives of propargyl alcohol with varying electron demand were structurally characterised using low temperature X-ray crystallography, these were combined with seven derivatives obtained from the Cambridge Structural Database. Variable oxygen probe analysis of these derivatives provided evidence that the ethynyl substituent is a relatively weak π-electron donor, and is a slightly less effective donor than the C–C bond of an ethyl substituent.

Synthesis, Structure, and Reactivities of Iminosulfane- and Phosphane-Stabilized Carbones Exhibiting Four-Electron Donor Ability

2015 ◽  
Vol 21 (43) ◽  
pp. 15405-15411 ◽  
Author(s):  
Tomohito Morosaki ◽  
Wei-Wei Wang ◽  
Shigeru Nagase ◽  
Takayoshi Fujii
Keyword(s):  
Electron Donor ◽  
Donor Ability ◽  
Electron Donor Ability

Electron donor ability of the annelated end-groups of polymethine dyes

1990 ◽  
Vol 12 (3) ◽  
pp. 219-231 ◽  
Author(s):  
G.G. Dyadyusha ◽  
A.D. Kachkovski ◽  
M.L. Dekhtyar
Keyword(s):  
Electron Donor ◽  
Polymethine Dyes ◽  
End Groups ◽  
Donor Ability ◽  
Electron Donor Ability

DDQ-promoted thiocyanation of aromatic and heteroaromatic compounds

2007 ◽  
Vol 85 (11) ◽  
pp. 930-937 ◽  
Author(s):  
Hamid R Memarian ◽  
Iraj Mohammadpoor-Baltork ◽  
Kobra Nikoofar
Keyword(s):  
Electron Donor ◽  
Room Temperature ◽  
Ammonium Thiocyanate ◽  
Methanol Solution ◽  
Heteroaromatic Compounds ◽  
Rate Of Reaction ◽  
Donor Ability ◽  
Electron Donor Ability

Thiocyanation of various aromatic and heteroaromatic compounds has been achieved using ammonium thiocyanate in the presence of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) in methanol solution at room temperature and under reflux condition. The rate of reaction is influenced by the electron-donor ability of the aromatic nucleus.Key words: amines, DDQ, indoles, thiocyanation.

The Formation ofcyclo-P4 Ligands with Maximum Electron Donor Ability

1992 ◽  
Vol 31 (10) ◽  
pp. 1377-1379 ◽  
Author(s):  
Manfred Scheer ◽  
Christa Troitzsch ◽  
Peter G. Jones
Keyword(s):  
Electron Donor ◽  
Donor Ability ◽  
Electron Donor Ability

scholarly journals Effects of Core and/or Peripheral Protonation ofmeso-Tetra(2-, 3-, and 4-pyridyl)Porphyrin andmeso-Tetra(3-methylpyridyl)Porphyrin on Their UV-vis Spectra

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Saeed Zakavi ◽  
Hajar Rahiminezhad ◽  
Aida Ghanbelanie Mojarrad ◽  
Tahereh Mokary Yazdeli ◽  
Robabeh Alizadeh
Keyword(s):  
Electron Donor ◽  
Blue Shift ◽  
Pyridyl Group ◽  
Vis Spectroscopy ◽  
Negative Effect ◽  
Donor Ability ◽  
Porphyrin Core ◽  
Electron Donation ◽  
Strong Acids ◽  
Electron Donor Ability

Core and/or peripheral protonation ofmeso-tetra(pyridyl)porphyrins, H2(py)P, with weak and strong acids have been studied by UV-vis spectroscopy. The results support the proposal that the position of the Soret as well as the Q(0,0) bands of the dications is influenced byπdonation from themesosubstituents to the porphyrin core. The red shift of the Q(0,0) band of H2t(py)P dications with 2-, 3-, and 4-pyridyl substituents does not correlate with the order ofπelectron donor ability of themesogroups. The decreased electron donation from the central nitrogen atoms to the acids on going from 3-pyridyl group to 4- and 2-pyridyl ones has been used to explain this observation. In spite of the negative effect of N-methylation of pyridyl substituents on the basicity of the central nitrogen atoms ofmeso-tetra(3-methylpyridyl)porphyrin, H2t(3-Mepy)P, protonation of H2t(3-Mepy)P occurs with weak and strong acids. The blue shift of the Q(0,0) bands upon protonation of H2t(3-Mepy)P with weak and strong acids clearly shows the importance of resonance interactions between theπ-systems of porphyrin and the aryl substituents on the position of the band.

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