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.
苯脲部分是超分子化学中普遍存在的合成子。本文报道,在尿素单元的邻位引入氯或溴原子是一种简单且极为有效的方法,可提升其分子间氢键供体的性质。该效应在溶液中的自聚二脲和单脲与强氢键受体的氢键作用两种情况下均得到了验证。