Spirocyclic Diaminocarbenes: Synthesis, Coordination Chemistry, and Investigation of Their Dimerization Behavior
作者:F. Ekkehardt Hahn、Martin Paas、Duc Le Van、Roland Fröhlich
DOI:10.1002/chem.200500306
日期:2005.8.19
Nonaromatic, "saturated", spirocyclic N-heterocyclic diaminocarbenes 11 can be obtained from spirocyclic imidazolidin-2-thiones 10 by reductive desulfurization with potassium. The unsymmetrically N,N'-substituted spirocyclic imidazolidin-2-thiones were obtained by reaction of ketimines 9 with lithium N-butyl-N-lithiomethyldithiocarbamate (6). 13C NMR spectroscopy revealed that the unsymmetrically N
非芳族的“饱和的”螺环N-杂环二氨基卡宾11可以通过用钾还原脱硫而由螺环的咪唑烷-2-硫酮10获得。通过使酮亚胺9与N-丁基-N-硫代甲基二硫代氨基甲酸酯锂(6)反应,获得不对称的N,N′-取代的螺环咪唑烷-2-硫酮。13C NMR光谱显示,不对称的N,N'-取代的螺环咪唑啉-2-亚甲基11a经历缓慢的酸催化二聚反应,得到烯四胺11a = 11a,它以两种同分异构形式存在(同义和反义) 。这种反应在特殊情况下是可逆的。11型卡宾与[W(CO)6]反应生成[W11(CO)5]型空气稳定的卡宾配合物(14)。