Graphical Representation Standards for Organic Chemistry Script: IUPAC Recommendation 2008
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Dhatrak N. R
Graphical Representation Standards for Organic Chemistry Script: IUPAC Recommendation 2008
Department of Chemistry Savitribai Phule Pune University Pune 411 007, India. Email:
[email protected]
In this article, we will acquaint ourselves with IUPAC representation standards in organic chemistry. Most of the chemistry is expressed through graphical representations, and therefore, molecular structures shall be sketched carefully so that the drawing conveys exact and desired meaning. There are specific rules and regulations governing the graphical representations in chemistry. Less literature is available for this purpose, but the importance of the topic can be well understood after knowing that the division of chemical nomenclature and structure representation of IUPAC has published the Graphical Representation Standards for Chemical Structures in 2008 comprising 134 pages. The present article focuses on the etiquettes of structure drawings along with a summary in brief about the IUPAC 2008 recommendations in perspectives of organic chemistry. Introduction Chemical structures are indeed the language of chemistry. The purpose of the chemical drawing is to convey the exact connectivity of the atoms in two-dimensional forms. The structures drawn must be correct and devoid of any ambiguity. It is anticipated that the structure sketched shall convey a clear and unique meaning. There are certain rules and regulations suggested by IUPAC for the correctness and universal acceptability of structures of molecules. IUPAC has published these rules and norms as IUPAC Recommendations 2008 entitled Graphical Representation Standards for Chemical Structure Diagrams [1]. ∗
Keywords IUPAC recommendations 2008, bond-line diagrams, organic chemistry script, molecular diagrams, representation standards.
Vol.25, No.8, DOI: https://doi.org/10.1007/s12045-020-1029-4
RESONANCE | August 2020
1141
CLASSROOM
In general, there are two methods in practice for drawing organic molecules.
In general, there are two methods in practice for drawing organic molecules. The very first method involves the depiction of each atom in the molecule and its connectivity in detail or to write condensed molecular formulas. Chemistry students practice this method in their early stages of learning chemistry. This method suffers many problems; like writing every atom and bond makes the molecule challenging to write and understand. Also, the structure becomes more alpha-numeric. There occurred several modifications in the organic chemistry script with the growing need of writing and representation. An improvised method of sketching organic molecules involves the omission of hydrogen in the aliphatic part and writing the carbon skeleton along with functional groups. This method, in general, referred to as the ‘bond-line structure representation’. Drawing structures in bond-line forms give a pictorial touch to organic structures, and the script becomes easy to write and understand. The method soon became famous because of its simplicity and is
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