Rational Synthesis and Mutual Conversion of Bis‐N‐heterocyclic Diphosphanes and Secondary N‐Heterocyclic Phosphanes
作者:Oliver Puntigam、Daniela Förster、Nick A. Giffin、Sebastian Burck、Johannes Bender、Fabian Ehret、Arthur D. Hendsbee、Martin Nieger、Jason D. Masuda、Dietrich Gudat
DOI:10.1002/ejic.201201471
日期:2013.4.12
hydrolysis, and thus grants high product yields. In some cases, secondary phosphanes were formed together with or instead of diphosphanes. This reaction is explained by a follow-up process involving homolytic fission of diphosphanes to give phosphanyl radicals, which then react with ammonium salts to give a mixture of secondary phosphanes and chlorophosphanes. Even if its synthetic scope is as yet limited
对称 N-杂环 1,1',3,3'-四氢-2,2'-bi-1,3,2-二氮杂磷和 2,2'-bi-1,3,2-二氮杂磷从 1,4-二氮杂丁二烯或 N-烷基或 N-芳基取代的乙烷-1,2-二胺开始,节省、连续的“一锅法”合成。这种方法提供了高选择性,并最大限度地减少了由于不需要的水解而造成的产物损失,从而获得了高产率。在某些情况下,二级膦与二膦一起形成或代替二膦形成。该反应可通过后续过程来解释,该过程涉及双膦均裂生成膦酰基,然后与铵盐反应生成仲膦和氯膦的混合物。即使它的合成范围还有限,与依赖使用复杂氢化物作为还原剂的常见合成方案相比,这种方法在提供卓越的选择性和更高的产率方面似乎很有希望。除了二膦还原转化为仲膦之外,还报道了反应物暴露于光下的逆反应。