were investigated. With methylhydrazine, formation of two regioisomeric pairs of pyrazolines and pyrazoles was observed. The ratio of the products varied with the solvent and temperature. Transformation of 5-ferrocenyl-N-substituted pyrazolines into pyrazoles was systematically studied and DDQ was found to be the most suitable reagent. Mechanism of the cyclization reactions taking place under kinetic-
1-苯基-3-
二茂铁基-2-
丙烯-1-酮的环缩合(1)与RNHNH2
肼的关系以及取代基依赖性产物的分布进行了研究。用甲基
肼观察到形成了两个对位的
吡唑啉和
吡唑区域异构体。产物的比例随溶剂和温度而变化。系统研究了5-
二茂铁基-N-取代的
吡唑啉向
吡唑的转化,发现
DDQ是最合适的试剂。DFT计算支持在动力学和热力学控制下发生环化反应的机理。EI MS还研究了
吡唑啉向
吡唑的转化的能量依赖性。新化合物的结构测定是通过IR,MS和NMR方法进行的,包括2D-HMQC,2D-HMBC,
DEPT和DIFFNOE测量。对于两种化合物,还通过X射线衍射证明了结构。