 | Acta Crystallographica Section E Acta Crystallographica Section E CRYSTALLOGRAPHIC COMMUNICATIONS |
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![[Figure 1]](ex2002fig1mag.jpg)
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Figure 1
The four possible stereoisomers resulting from the [2 + 2]-cycloaddition of (E)-chalcones (Cibin et al., 2003  ): (a) syn head-to-head; (b) anti head-to-head; (c) syn head-to-tail and (d) anti head-to-tail; (e) supra–supra bonding interaction (π2s + π2s) of SOMO–LUMO to produce the syn head-to-head stereoisomer shown in (a). |
![[Figure 1]](ex2002fig1.jpg)
| CRYSTALLOGRAPHIC COMMUNICATIONS |
ISSN: 2056-9890
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