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IUPAC Nomenclature of Carboxylic Acids

IUPAC Nomenclature of Carboxylic Acids

IUPAC names of carboxylic acids are systematically derived following a few rules discussed below.
For acyclic saturated monocarboxylic acids, the longest hydrocarbon chain containing the –COOH carbon is identified as the parent chain. Then, the last -e of the parent hydrocarbon name is replaced with a suffix -oic acid.

IUPAC Nomenclature of Aldehydes

IUPAC Nomenclature of Aldehydes

Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic...

Cell Diagrams and IUPAC Conventions

Cell Diagrams and IUPAC Conventions

Electrochemical cell notation is a standardized symbolic representation that communicates the structure and reaction pathway of galvanic and electrolytic cells. This notation plays a critical role in describing redox reactions and electrochemical cell configurations without the need for detailed diagrams.In electrochemical cell notation, a single vertical line “|” denotes a phase boundary, such as between a solid electrode and an aqueous solution. A double vertical line...

IUPAC Nomenclature of Ketones

IUPAC Nomenclature of Ketones

Like aldehydes, ketones are named using IUPAC rules; in this case, by replacing “e” in the name of the longest hydrocarbon chain with “one.” In acyclic ketones, the ketonic carbon is given the lowest locant value. For instance, as shown below, a simple five-carbon ketone is named pentan-2-one, instead of pentan-4-one. IUPAC rules also allow the placing of the locant value before the parent name to give an alternate name, 2-pentanone.

Naming Enantiomers

Naming Enantiomers

The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three...

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

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Updated: Apr 7, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

InChI, the IUPAC International Chemical Identifier.

Stephen R Heller¹, Alan McNaught², Igor Pletnev³

¹Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8362 USA.

Journal of Cheminformatics

|July 3, 2015

Summary

This summary is machine-generated.

The International Chemical Identifier (InChI) provides a standardized way to represent chemical structures. This paper details the design, layout, and algorithms behind this crucial chemical identification system.

Keywords:

Chemical identifier Chemical structure linear notation IUPAC standard InChI InChIKey

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

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Published on: September 12, 2018

Area of Science:

Chemical informatics
Computational chemistry
Data standardization

Background:

Chemical structure representation is fundamental to chemistry.
Existing methods lacked a universal standard for unambiguous identification.
The need for a machine-readable and human-readable chemical identifier was recognized.

Purpose of the Study:

To document the design principles of the IUPAC International Chemical Identifier (InChI).
To describe the layout and algorithmic approaches used in InChI generation.
To provide a foundational reference for the InChI standard.

Main Methods:

Algorithmic development for chemical structure encoding.
Design of a layered, textual identifier format.
Implementation of standardization rules for chemical nomenclature and structure.

Main Results:

Successful development and documentation of the InChI algorithm.
Establishment of a robust system for unique chemical identification.
Publication of the InChI design, layout, and algorithms.

Conclusions:

The InChI provides a standardized, open, and machine-readable chemical identifier.
The documented design and algorithms enable consistent InChI generation and interpretation.
InChI facilitates data sharing, retrieval, and integration in chemistry.