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Directing Effect of Substituents: meta-Directing Groups

Directing Effect of Substituents: meta-Directing Groups

Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...

Overview of Advanced Functional Groups

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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.

Introduction to Functional Groups

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Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
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Directing Effect of Substituents: ortho–para-Directing Groups

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...

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The acidity of carboxylic acids is influenced by the nature of the substituents bounded to the functional group. The acid strength is determined by the stability of the carboxylate anion—the conjugate base formed by dissociating the corresponding carboxylic acid.

Functional Groups

Functional Groups

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Toward Universal Substituent Constants: Relating QTAIM Functional Group Descriptors to Substituent Effect Proxies.

Kevin M Lefrancois-Gagnon¹, Robert C Mawhinney¹

¹Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada.

Journal of Chemical Information and Modeling

|September 20, 2023

Summary

Quantum chemical substituent descriptors accurately reflect traditional chemical proxies for reaction modulation. Multivariate analysis confirms these intrinsic properties offer predictable insights into substituent effects, despite some data limitations.

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Area of Science:

Computational Chemistry
Organic Chemistry

Background:

Substituent effects are crucial for modulating chemical reactions.
Traditionally, proxies are used to describe substituent properties, lacking direct quantum chemical basis.

Purpose of the Study:

To relate substituent descriptors from the quantum theory of atoms in molecules (QTAIM) to traditional proxies.
To assess the significance and predictive power of these intrinsic substituent properties.

Main Methods:

Multivariate statistical analyses, including multiple linear regression (MLR), principal component analysis (PCA), and partial least squares regression (PLS).
Comparison of QTAIM-derived descriptors with established chemical proxies.

Main Results:

QTAIM substituent descriptors contain information similar to traditional proxies.
These descriptors represent intrinsic and predictable properties of substituents.
Multivariate analyses successfully demonstrated the relationship and significance of these descriptors.

Conclusions:

Quantum chemical descriptors offer a more fundamental and predictable way to understand substituent effects in reactions.
While promising, limitations such as transferability, experimental accuracy, and solvation need consideration for quantitative reproduction.