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Figure 1
`Theoretical' relationships of π-bond coooperativity and anticooperativity in the fusion of two enolone and/or enaminone fragments forming intramolecular R3-RAHB rings. Numbering as 1–4 the covalent bonds, four different junctions ([4,4′], [2,2′], [3,2′] and [2,3′]) are possible, each having the hydrogen bonds in different positions. Schemes drawn in bold correspond to patterns actually found in practice.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 62| Part 5| September 2006| Pages 850-863
doi:10.1107/S0108768106020933
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