Publications by authors named "Anu Lal"
We designed and synthesized three diacetylene monomers M1-M3 having two NH2 groups. As anticipated, the NH2 groups aided the preorganization of these monomers by N-H…N hydrogen bonding. In the crystals of monomer M1 and M2, the intermolecular N-H…N hydrogen bonding preorganized the diyne units in an orientation suitable for their topochemical polymerization, but in the case of monomer M3, the distance was slightly larger than that recommended for the topochemical reaction.
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- A specially designed anthracene-based monomer was found to crystallize in a favorable arrangement for Diels-Alder reactions, allowing for potential linear polymer formation, as shown by single-crystal X-ray diffraction.
- When heated above 125°C, instead of forming a polymer, the monomer underwent an unexpected intramolecular Diels-Alder reaction, confirmed by various analytical techniques.
- This study highlights that while Schmidt's criteria predict polymerization based on crystal structure, they can be misleading in heat-induced situations, as the molecular rotation led to a different reaction pathway.