Characterization of size-selective kinetic-based Ba-ETS-4 titanosilicate for nitrogen/methane separation: Chlorine-enhanced steric effects

2021 ◽  
pp. 120243
Author(s):  
Mahsa Vosoughi ◽  
Hafez Maghsoudi
Keyword(s):  
Steric Effects

Nuclear magnetic resonance characterization of the ring conformations of monosubstituted derivatives of 1,3-dioxa-5,6-benzocycloheptene

1983 ◽  
Vol 61 (1) ◽  
pp. 109-115 ◽  
Author(s):  
R. St-Amour ◽  
M. St-Jacques
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Substituent Effects ◽  
Steric Effects ◽  
Slow Exchange ◽  
Conformational Properties ◽  
Derivatives Of ◽  
Ring Conformations ◽  
Twist Boat

The conformational properties of 2-alkyl (Me, Et, i-Pr, and t-Bu) and 2-phenyl derivatives of 1,3-dioxa-5,6-benzocycloheptene (1) were studied by 13C dnmr. Analysis of slow exchange spectra at 100.6 MHz indicates that all derivatives except tert-butyl exist in an equilibrium of chair (major) and twist-boat (minor) conformations. Substituent effects on the position of the equilibrium are rationalized in terms of steric effects.

Synthesis and Characterization of a Series of Cationic Porphyrins Having Different Steric Effects

2000 ◽  
Vol 30 (11) ◽  
pp. 2009-2017 ◽  
Author(s):  
Shu-Qing Liu ◽  
Hao-Ran Sun ◽  
Zhi-Tao Sun ◽  
Ji-Qing Xu ◽  
Dong-Mei Li
Keyword(s):  
Steric Effects ◽  
Synthesis And Characterization ◽  
Cationic Porphyrins

Synthesis and characterization of a lacunar bis(isothiocyanato)cobalt(III) cyclidene complex: a structural model for distal steric effects in hemoproteins

1986 ◽  
Vol 25 (22) ◽  
pp. 4015-4020 ◽  
Author(s):  
Patricia J. Jackson ◽  
Colin Cairns ◽  
Wang Kan Lin ◽  
Nathaniel W. Alcock ◽  
Daryle H. Busch
Keyword(s):  
Structural Model ◽  
Steric Effects ◽  
Synthesis And Characterization

ChemInform Abstract: Synthesis and Characterization of a Series of Cationic Porphyrins Having Different Steric Effects.

ChemInform ◽  
2010 ◽  
Vol 31 (36) ◽  
pp. no-no
Author(s):  
Shu-Qing Liu ◽  
Hao-Ran Sun ◽  
Zhi-Tao Sun ◽  
Ji-Qing Xu ◽  
Dong-Mei Li
Keyword(s):  
Steric Effects ◽  
Synthesis And Characterization ◽  
Cationic Porphyrins

Pyrolysis of aryl azides. V. Characterization of phenylazo, benzoyl and formyl as neighbouring groups

1980 ◽  
Vol 33 (1) ◽  
pp. 91 ◽  
Author(s):  
NJ Dickson ◽  
LK Dyall
Keyword(s):  
Alternative Pathway ◽  
Steric Effects ◽  
Aryl Azides

The enhancements of thermolysis rate of azidobenzene produced by ortho phenylazo, benzoyl and substituents are 21180, 70.0 and 22.8 at 393.2 K (decalin solutions). The same ortho substituents produce much smaller enhancements (169, 8.56 and 10.7 respectively) in the pyrolysis rate of 1-azido-2,4-dibromobenzene. These results are interpreted as steric effects on an electro-cyclic thermolysis mechanism, and are not consistent with the alternative pathway of intramolecular 1,3-dipolar addition which continues to be advocated by Hall and Dolan.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

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