Orthohalogen substituents dramatically enhance hydrogen bonding of aromatic ureas in solution
作者:Ilaria Giannicchi、Benjamin Jouvelet、Benjamin Isare、Mathieu Linares、Antonella Dalla Cort、Laurent Bouteiller
DOI:10.1039/c3cc47447j
日期:——
The phenylurea moiety is a ubiquitous synthon in supramolecular chemistry. Here we report that the introduction of chlorine or bromine atoms in the ortho positions to the urea unit is a simple and very efficient way to improve its intermolecular hydrogen bond (HB) donor character. This effect was demonstrated in solution both in the context of self-association of bis-ureas and hydrogen bonding of mono-ureas to strong HB acceptors.