Synthesis and structures of 1,3,1′,3′-tetrabenzyl-2,2′-biimidazolidinylidenes (electron-rich alkenes), their aminal intermediates and their degradation products
作者:Bekir Çetinkaya、Engin Çetinkaya、José A. Chamizo、Peter B. Hitchcock、Hatam A. Jasim、Hasan Küçükbay、Michael F. Lappert
DOI:10.1039/a802123f
日期:——
substituted enetetramines 9 and 3 have been studied. From HNR(CH2)2NRH and CH(NMe2)2OBut or CH(OMe)2NMe2, two new intermediates along the pathway to 9, namely the orthoamide 11 and the bis(orthoamide) 12 were isolated. Each of 11 and 12 was converted into 9 by refluxing in toluene. Photolysis of 9 yielded the isomer 10, while thermolysis of 9 gave the di(debenzylated) product 1,1′-dibenzyl-2,2′-biimidazoline
已研究了苄基(R)取代的四胺(9)和(3)。从HNR(CH 2)2 NRH和CH(NMe 2)2 OBu t或CH(OMe)2 NMe 2中,分离出两个通往9的新中间体,即邻酰胺11和双邻酰胺12。通过在甲苯中回流,将11和12中的每一个转化为9。9的光解生成异构体10,而9的热解生成二(去苄基化)产物1,1'-二苄基-2,2'-联咪唑啉13。至3的路线(R = R'= CH 2 Ph)类似于用于9的那些,涉及1,2-C 6 H 4 [N(R)H] 2与CH(OMe)2的缩合NMe 2或1,3-二苄基苯并咪唑氯化物8(X = Cl)与NaH之间的反应未得到预期的烯四胺3(9的二苯并类似物),取而代之的是双(脱苄基)产物15。加热orthoamide 1,2--R NC 6 H ^ 4 N(R)C (H)NME 2,从CH制备(NME 2)2 OBU吨和1,2--C 6 H ^ 4 [N(H)R]