O-Phenylisourea Synthesis and Deprotonation: Carbodiimide Elimination Precludes the Reported Chapman Rearrangement
作者:Joseph A. Tate、George Hodges、Guy C. Lloyd-Jones
DOI:10.1002/ejoc.201600386
日期:2016.6
The kinetics of the addition of phenol to diisopropylcarbodiimide, and reaction of the resulting N,N′-diisopropyl-O-phenylisourea with hydroxide, are reported. The isourea is generated by a slow overall termolecular equilibrium process, inhibited by isourea–phenol salt generation. In contrast to an earlier report, reaction of the isourea with hydroxide does not induce a synthetically useful 1,3-O–N
报告了苯酚加成到二异丙基碳二亚胺的动力学,以及所得 N,N'-二异丙基-O-苯基异脲与氢氧化物的反应。异脲是由缓慢的整体双分子平衡过程产生的,受异脲-酚盐的抑制。与较早的报道相反,异脲与氢氧化物的反应不会引起合成有用的 1,3-O-N(查普曼)重排。相反,去质子化通过碳二亚胺消除导致溶剂分解。