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Relationship between Rotational Barriers and Charge Shifts.

Kenneth B Wiberg¹

¹Department of Chemistry , Yale University , New Haven , Connecticut 06520 , United States.

The Journal of Organic Chemistry

|July 30, 2019

Summary

This summary is machine-generated.

Quantifying conjugation and hyperconjugation stereoelectronic effects is possible using computational methods. These analyses reveal linear relationships between rotational barriers and charge shifts in various organic molecules.

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Area of Science:

Organic Chemistry
Computational Chemistry

Background:

Conjugation and hyperconjugation are fundamental stereoelectronic effects in chemistry.
These effects are typically understood through qualitative descriptions.

Purpose of the Study:

To develop a quantitative approach for analyzing conjugation and hyperconjugation.
To investigate the energetic consequences of these stereoelectronic interactions.

Main Methods:

Utilizing the natural bond orbital (NBO) method for energetic estimations.
Employing charge shift analysis to study electronic redistribution.
Comparing charge distributions between ground and transition states.

Main Results:

Established quantitative links between stereoelectronic effects and molecular properties.
Identified linear relationships between rotational barriers and charge shifts.
Observed competition between sigma- and pi-charge transfer influencing molecular behavior.

Conclusions:

Conjugation and hyperconjugation can be quantitatively assessed.
Charge transfer dynamics are crucial in determining rotational barriers.
Computational methods offer valuable insights into stereoelectronic effects.