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![[Figure 3]](ba5260fig3mag.jpg)
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Figure 3
Examples of counting π electrons in sulfur–nitrogen rings where all atoms are sp2-hybridized. The total numbers of π electrons are (a) six (Wilberg et al., 2001  ), (b) six (Chivers & Manners, 2009), (c) six (Chivers & Manners, 2009), (d) ten (Chivers & Manners, 2009), (e) eight (Chivers, 2005), (f) ten (Chivers, 2005) and (g) ten (Chivers, 2005). All rings apart from (e) obey Hückel's 4n + 2 rule, where n is an integer. Therefore, all rings apart from that in (e) are perceived as aromatic rings. |
![[Figure 3]](ba5260fig3.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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