Fig. 3
From: A database of steric and electronic properties of heteroaryl substituents
Overview of selected electronic and steric descriptors. (a) Definition of Hammett-type substituent constant (σHet) for heteroaryl groups as an electronic descriptor. (b) Distribution of σHet in the database. (c) σHet of selected heteroaryl groups. (d) Examples demonstrating different steric and electronic properties between two heteroaryl regioisomers.
