Unexpected Squaramide-Induced Cleavage of Benzils: Synthesis and Characterization of Mono-Aroyl Squarimides
作者:Elena Sanna、Carlos López、Pablo Ballester、Carmen Rotger、Antoni Costa
DOI:10.1002/ejoc.201501235
日期:2015.12
We report the reaction of 4,4′-substituted benzils with squaramides (SQ) affording mono-squarimides (SQIs). The 1H NMR and X-ray structures of the SQIs (R = H) revealed the existence of a strong C=O···HN intramolecular hydrogen-bond motif. The unprecedented reaction between SQs and benzils highlights the difference in reactivity between urea and squaramide units.