Syntheses of heterocyclic compounds. Part XVIII. Aminolysis of 3-aryl-4-bromosydnones, and acid hydrolysis of 3-arylsydnoneimines
作者:G. S. Puranik、H. Suschitzky
DOI:10.1039/j39670001006
日期:——
various 3-aryl- and 3-heteroaryl-4-bromosydnones with piperidine gives the corresponding piperidino-glycyl-piperidines. Fluorine labelling has confirmed the postulated course of fission induced by acids in 3-aryl-sydnoneimines.
Sydnone Photochemistry: Direct Observation of Earl's Bicyclic Lactone Valence Isomers (Oxadiazabicyclo[2.1.0]pentanones), Formation of Carbodiimides, Reaction Mechanism, and Photochromism
作者:Rakesh N. Veedu、David Kvaskoff、Curt Wentrup
DOI:10.1071/ch13536
日期:——
diphenylnitrile imine PhCNNPh 26 as an intermediate (2340 cm–1). Neither bicyclic lactones nor carbodiimides have been observed previously in sydnone photochemistry. A general reaction mechanism for the formation of carbodiimides, nitrile imines, and photochromism is put forward.
3-苯基- ,3-吡啶基,和3,4- diphenylsydnones的矩阵photolyses 16,19,和22分别通过基质隔离红外光谱研究。伯爵推测的中性,双环内酯价异构体-恶二氮杂双环[2.1.0]戊酮exo -17和exo -20-在前两种情况下均很明显,在exo -23情况下也很可能( C = O分别在1881、1886和1874 cm –1处的红外吸收)。sydnones的有效光分解而碳化二亚胺RN = C = NR'(18,21,和24)和CO在这三个案例中均建立了2个。的苄腈的形成27和azacycloheptatetraene 29在diphenylsydnone的矩阵光解22指示diphenylnitrile亚胺PhCNNPh的26作为中间(2340厘米-1)。以前在亚砜光化学中既没有观察到双环内酯也没有碳二亚胺。提出了形成碳二亚胺,腈亚胺和光致变色反应的一般反应机理。