On the Origin of Higher Rotational Barriers in Thioamides than in Amides. Remote Substituent Effects on the Conformational Stability of the Thioamide Group in Thioacetanilides

2003 ◽  
Vol 107 (30) ◽  
pp. 5854-5861 ◽  
Author(s):  
Boris Galabov ◽  
Sonia Ilieva ◽  
Boriana Hadjieva ◽  
Eli Dinchova
Keyword(s):  
Conformational Stability ◽  
Substituent Effects ◽  
Thioamide Group ◽  
Rotational Barriers ◽  
Remote Substituent

Spin-crossover in a trans-[FeL2(NCS)2] family (L = triaryltriazole): remote substituent effects on spin transition modes and temperature

2013 ◽  
Vol 42 (28) ◽  
pp. 10144 ◽  
Author(s):  
Guo-Ping Shen ◽  
Li Qi ◽  
Lei Wang ◽  
Yan Xu ◽  
Jing-Jing Jiang ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Spin Transition ◽  
Substituent Effects ◽  
Transition Modes ◽  
Remote Substituent

Modulating Twisted Amide Geometry and Reactivity Through Remote Substituent Effects

2021 ◽  
Author(s):  
Mizhi Xu ◽  
McKinley K. Paul ◽  
Krista K. Bullard ◽  
Christopher DuPre ◽  
Will R. Gutekunst
Keyword(s):  
Substituent Effects ◽  
Remote Substituent

Carbon-13 N.M.R. chemical shifts and rotational barriers of para-substituted N,N-dimethylbenzamides

1978 ◽  
Vol 31 (12) ◽  
pp. 2615 ◽  
Author(s):  
CW Fong ◽  
SF Lincoln ◽  
EH Williams
Keyword(s):  
Chemical Shift ◽  
Chemical Shifts ◽  
Substituent Effects ◽  
Rotational Barrier ◽  
Rotational Barriers

The carbon-13 N.M.R. chemical shifts for a series of para-substituted N,N-dimethylbenzamides have been measured. The substituent induced 13C shifts have been examined by a dual substituent parameter (DSP) method using Hammett-type constants. The barriers to rotation have also been correlated with Hammett-type constants by the DSP method and related to 13C substituent induced shifts. Substituent effects of the bromomethyl, dibromomethyl and tribromomethyl groups have been examined by using the chemical shift and rotational barrier probes.

Remote Substituent Effects in Ruthenium-Catalyzed [2+2] Cycloadditions:  An Experimental and Theoretical Study

2006 ◽  
Vol 71 (10) ◽  
pp. 3793-3803 ◽  
Author(s):  
Peng Liu ◽  
Robert W. Jordan ◽  
Steven P. Kibbee ◽  
John D. Goddard ◽  
William Tam
Keyword(s):  
Theoretical Study ◽  
Substituent Effects ◽  
Remote Substituent
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