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The control of a solid-state polymerization reaction using hydrogen-bonding to direct crystal packing has been attempted. The chemical reaction is the 2+2 photocycloaddition of olefin groups of amide derivatives of p-phenelenediacrylic acid. In single crystals, hydrogen-bonds organize these molecules in two-dimensional 'ribbon', 'sheet', or 'tape' networks. No reaction has been observed between molecules within these networks. However, when the molecules adopt a planar conformation, the networks pack together such that cycloaddition can take place between molecules in adjacent networks.