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Introduction to Functional Groups

Introduction to Functional Groups

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.
Types of common functional groups
The table below summarizes some of the major functional...

Overview of Advanced Functional Groups

Overview of Advanced Functional Groups

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.

Overview of Functional Groups

Overview of Functional Groups

Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, certain functional groups will make a molecule hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each functional group is a unique...

Organic Compounds

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...

Predicting Molecular Geometry

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

Mass Spectrum: Interpretation

Mass Spectrum: Interpretation

An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
To...

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Related Experiment Video

Updated: Sep 12, 2025

A Protocol for Computer-Based Protein Structure and Function Prediction

A Protocol for Computer-Based Protein Structure and Function Prediction

Published on: November 3, 2011

AccFG: Accurate Functional Group Extraction and Molecular Structure Comparison.

Xuan Liu¹, Sarathkrishna Swaminathan², Dmitry Zubarev²

¹Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S Mathews Ave, Urbana, Illinois 61801, United States.

Journal of Chemical Information and Modeling

|August 7, 2025

Summary

This summary is machine-generated.

AccFG accurately extracts functional groups and heterocycles from molecular structures. This tool enables precise molecular comparisons by identifying functional group differences, aiding in understanding structure-activity relationships.

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Area of Science:

Computational chemistry
Cheminformatics
Drug discovery

Background:

Accurate identification of functional groups is vital for understanding molecular properties and structure-activity relationships.
Current methods face challenges in precisely extracting functional groups from complex molecular structures.

Purpose of the Study:

To present AccFG, a novel tool for precise functional group extraction and molecular structure comparison.
To develop a system that generates structured functional group descriptors and facilitates library extension.

Main Methods:

AccFG utilizes a predefined library to generate refined functional group descriptors for molecules.
The tool maps identified functional groups and heterocycles to atom numbers for detailed comparison.
Performance was evaluated using diverse datasets and manual examination.

Main Results:

AccFG demonstrated high accuracy in extracting functional groups from individual molecules.
The tool successfully identified functional group-level differences between molecular pairs.
AccFG bridges molecular structures and textual descriptors effectively.

Conclusions:

AccFG provides a robust solution for processing functional groups in molecular data.
The tool's structured output enables fine-grained insights into molecular structure-property relationships.
AccFG is expected to be a valuable resource for computational chemistry and drug discovery research.