Steric Effects in Elimination Reactions. V. The Importance of Steric Strains in the Extent and Direction of Unimolecular Elimination. The Role of Steric Strains in the Reactions of Highly Branched Carbonium Ions

1955 ◽  
Vol 77 (13) ◽  
pp. 3623-3628 ◽  
Author(s):  
Herbert C. Brown ◽  
Ichiro Moritani
Keyword(s):  
Steric Effects ◽  
Carbonium Ions ◽  
Elimination Reactions

Steric Effects in the Electronic Spectra of the 3,5-Diarylaminobenzene Derivatives

1986 ◽  
Vol 41 (11) ◽  
pp. 1311-1314 ◽  
Author(s):  
A. Balter ◽  
W. Nowak ◽  
P. Milart ◽  
J. Sepioł
Keyword(s):  
Excited State ◽  
Electronic Spectra ◽  
Fluorescence Properties ◽  
Steric Effects ◽  
Quantum Yields ◽  
Spectroscopic Behaviour ◽  
Fluorescence Quantum Yields ◽  
Excited State Lifetimes ◽  
Methyl Phenyl

Absorption and fluorescence properties, excited state lifetimes and fluorescence quantum yields were determined for a series of 3,5-diarylaminobenzene derivatives in solvents of different polarities. The role of the nitrile, methyl, phenyl and naphthyl substituents is discussed. Especially the steric effects on the spectroscopic behaviour of the investigated molecules are studied.

Electrophilic additions to allenes. VI. The role of steric versus electronic effects in the reactions of arenesulphenyl halides with allenes

1980 ◽  
Vol 58 (24) ◽  
pp. 2737-2744 ◽  
Author(s):  
Dennis G. Garrattz ◽  
Pierre L. Beaulieu
Keyword(s):  
Positive Charge ◽  
Steric Effects ◽  
Rate Data ◽  
Electronic Effects ◽  
Rate Determining Step ◽  
Minimal Importance ◽  
Electrophilic Additions

The role of steric and electronic effects during the rate and product determining steps for the addition of arenesulphenyl chlorides to 1,3-disubstituted allenes has been briefly examined. Both effects appear to be generally of minimal importance during the rate determining step. The available rate data indicate the presence of little, if any, build up of positive charge on sulphur. These results are interpreted in terms of an SN2 attack on bivalent sulphur leading to an alkylidenethiiranium ion intermediate. Steric effects are of greater importance in the product determining step, particularly when the sulphenyl chlorides possess two bulky ortho substituents, as in the case of 2,4,6-triisopropylbenzenesulphenyl chloride.

Unexpected formation and conversion: role of substituents of 1,3-ynones in the reactivity and product distribution during their reactions with Ru3(CO)12

2019 ◽  
Vol 43 (3) ◽  
pp. 1478-1486
Author(s):  
Lei Xu ◽  
Liping Jiang ◽  
Shasha Li ◽  
Guofang Zhang ◽  
Weiqiang Zhang ◽  
...  
Keyword(s):  
Product Distribution ◽  
Molecular Structures ◽  
Steric Effects ◽  
Unexpected Formation ◽  
Electronic And Steric Effects

Electronic and steric effects of the substituents in 1,3-ynones play key roles in the product distribution and molecular structures.

Elimination reactions. V. Steric effects in Hofmann elimination

1975 ◽  
Vol 97 (15) ◽  
pp. 4323-4327 ◽  
Author(s):  
James L. Coke ◽  
G. Dale Smith ◽  
George H. Britton
Keyword(s):  
Steric Effects ◽  
Elimination Reactions ◽  
Hofmann Elimination

Experimental and Computational Studies of Unimolecular 1,1-HX (X = F, Cl) Elimination Reactions of C2D5CHFCl: Role of Carbene:HF and HCl Adducts in the Exit Channel of RCHFCl and RCHCl2Reactions

2019 ◽  
Vol 123 (13) ◽  
pp. 2621-2633 ◽  
Author(s):  
Blanton R. Gillespie ◽  
Chaitanya A. Patel ◽  
Mallory M. Rothrock ◽  
George L. Heard ◽  
D. W. Setser ◽  
...  
Keyword(s):  
Computational Studies ◽  
Exit Channel ◽  
Elimination Reactions

Methylenimmonium ion and the role of resonance and inductive stabilization in carbonium ions

1973 ◽  
Vol 95 (2) ◽  
pp. 458-463 ◽  
Author(s):  
Peter A. Kollman ◽  
William F. Trager ◽  
Steve. Rothenberg ◽  
James E. Williams
Keyword(s):  
Carbonium Ions
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