The Reduction of Dipole Moment by Steric Hindrance in Di-t-butylhydroquinone and its Dimethyl Ether

1942 ◽  
Vol 64 (4) ◽  
pp. 937-940 ◽  
Author(s):  
P. F. Oesper ◽  
C. P. Smyth ◽  
M. S. Kharasch
Keyword(s):  
Dipole Moment ◽  
Dimethyl Ether ◽  
Steric Hindrance

Dipole Moment and Dielectric Relaxation of Some Aromatic Ethylenes and Butadienes

1980 ◽  
Vol 35 (6) ◽  
pp. 623-627 ◽  
Author(s):  
F. F. Hanna ◽  
K. N. Abdel-Nour ◽  
J. E. Risk
Keyword(s):  
Dipole Moment ◽  
Dielectric Relaxation ◽  
Steric Hindrance ◽  
Relaxation Times

The dipole moment of 1,1-bis-p-chlorophenylethylene, 1,1-bis-p-bromophenylethylene, 1,1-bis-pmethoxy, -ethoxy, -isopropoxy-phenyl-ethylene, 1,1,4,4-tetrakis-p-methoxy, -ethoxy, isopropoxyphenylbuta- l,3dienes was measured and compared with the calculated value. The mesomeric moment was estimated and found to decrease in the case of the ethylenes with the increase in volume of the substituted group. For the butadienes, the mesomeric moments compensate each other.Investigations of the dielectric relaxation times of the ethylenes showed that the orientation of the -OCH3 group in the 1,1-bis-p-methoxy-phenylethylene is hindered to a large extent. The orientation of the -OC2H5 and -OC3H7 groups in the corresponding molecules are restricted due to steric hindrance

scholarly journals Regioselectivity in the acylation of methylhydroquinone dimethyl ether: an unprecedented case of indirect steric hindrance

2011 ◽  
Vol 52 (14) ◽  
pp. 1612-1614 ◽  
Author(s):  
Fernando Macedo ◽  
César C. Andrei ◽  
Danilo Campiom ◽  
Noemia K. Ishikawa
Keyword(s):  
Dimethyl Ether ◽  
Steric Hindrance

Alkoxyl Side Chain Substituted Thieno[3,4-c]pyrrole-4,6-dione To Enhance Photovoltaic Performance with Low Steric Hindrance and High Dipole Moment

2016 ◽  
Vol 49 (16) ◽  
pp. 5788-5795 ◽  
Author(s):  
Dangqiang Zhu ◽  
Qianqian Zhu ◽  
Chuantao Gu ◽  
Dan Ouyang ◽  
Meng Qiu ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Steric Hindrance ◽  
Photovoltaic Performance ◽  
Side Chain

Electron and cation transport in fluid dimethyl ether: effects of density and temperature

1982 ◽  
Vol 60 (8) ◽  
pp. 1034-1043 ◽  
Author(s):  
Norman Gee ◽  
Gordon R. Freeman
Keyword(s):  
Dipole Moment ◽  
Dimethyl Ether ◽  
Ion Mobility ◽  
Inelastic Collisions ◽  
Localized States ◽  
Point Dipole ◽  
Density Control ◽  
Low Energy Electrons ◽  
Dense Vapor ◽  
Momentum Transfer Cross Section

The effect of molecular electric dipole moment D on charge transport in fluids was examined by measurement of electron and ion mobilities in dimethyl ether (D = 1.3 D) and comparing them with the behavior in hydrocarbons. The fluid density was varied continuously from that of the normal vapor to that of the normal liquid, passing through the critical region. The density normalized mobility nμe of electrons in dimethyl ether vapor at low densities is 30-fold smaller than that in propane, although for the cations nμ+ in the ether is only 1.4-fold smaller than that in the alkane. The permanent dipole moment of the ether dominates the scattering of low energy electrons but not that of cations. The electron momentum transfer cross section is roughly 33% larger than that predicted by the Altshuler point dipole model, and has a minimum at ~0.12 eV. The energy gained from the electric field is removed mainly through inelastic collisions, even in the thermal energy range.Molecular clustering decreases both electron and ion mobilities, but the effect on the former is much larger due to the greater change in reduced mass. The extent of electron quasilocalization in the dense vapor of dimethyl ether is four times greater than that in nonpolar hydrocarbons. Electrons form relatively stable localized states in the liquid at n/ne > 2.0. Ion mobility undergoes a transition from "density control" to "viscosity control" with increasing density in the low density liquid. Viscosity control is operative at n/ne > 2.4.

Steric hindrance influence of a diazo link upon mesogenic properties of some ligands and related copper complexes

1997 ◽  
Vol 94 ◽  
pp. 1695-1714 ◽  
Author(s):  
P Lesot ◽  
F Perez ◽  
P Judeinstein ◽  
JP Bayle ◽  
H Allouchi ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
Copper Complexes

THE DIPOLE MOMENT INTERACTION OF BOUND EXCITONS IN HIGHLY EXCITED CdS

1985 ◽  
Vol 46 (C7) ◽  
pp. C7-221-C7-225
Author(s):  
Bao Qingcheng ◽  
Dai Rensong ◽  
Xu Xurong
Keyword(s):  
Dipole Moment ◽  
Moment Interaction
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