Solid-state hydrogen-bonding self-assemblies and keto–enol tautomerism of 1,3-dipyrrolyl-1,3-propanediones
摘要:
Single-crystal X-ray analyses of various 1,3-dipyrrolyl-1,3-propanedione derivatives confirmed the formation of keto-based 1D N-H...O=C hydrogen-bonding chains and cis-enol-based hydrogen-bonding chains. The preferences for keto and enol tautomers in the solid state were found to depend significantly on the positions of substituents at pyrrole rings. -Aryl-substituted derivatives afford keto forms, while -alkyl- and -aryl-substituted derivatives provide cis-enol forms.