Mechanisms of reactions conducted on α-amido-α-aminonitrones, determined based on the structures of their crystalline products and DFT calculations
作者:Bartosz Trzewik、Tomasz Seidler、Ewa Brocławik、Katarzyna Stadnicka
DOI:10.1039/c0nj00193g
日期:——
The crystal structures of several compounds obtained from recently synthesised α-amido-α-aminonitrones were determined by X-ray diffraction. The compounds belonged to three different classes: 1,2,5-oxadiazin-4-ones, amidines and dibenzo[d,f][1,3]diazepines. In spite of the fact that they were yielded in reactions of various kinds, all the products contained the same amido-amidine moiety. We discovered that some geometrical parameters within the moiety had non-typical values; for example the Csp2âCsp2 single bonds were outstandingly long. A detailed analysis of the products' geometry, aided by DFT calculations for selected structures, allowed us to propose mechanisms of their formation.
通过 X 射线衍射测定了从最近合成的δ-±-酰胺-δ-氨基硝基化合物中获得的几种化合物的晶体结构。这些化合物属于三个不同的类别:1,2,5-恶二嗪-4-酮、脒和二苯并[d,f][1,3]二氮杂卓。尽管它们在各种反应中产生,但所有产物都含有相同的脒基。我们发现,该分子中的一些几何参数值并不典型;例如,Csp2âCsp2 单键就很长。在对选定结构进行 DFT 计算的帮助下,我们对产物的几何形状进行了详细分析,从而提出了它们的形成机制。