Cycloaddition Reactions of 7-Benzylidenecycloocta-1,3,5-triene with Ethenetetracarbonitrile and 4-Phenyl-3H-1,2,4-triazole-3,5(4H)-dione
作者:Philip Clements、George E. Gream、Paul K. Kirkbride、Simon M. Pyke
DOI:10.1002/hlca.200590153
日期:2005.7
improved procedure, is treated with t-BuOK in THF. Alternatively, a ca. 9 : 1 mixture (E)/(Z)-5 can be prepared in a Wittig reaction involving benzaldehyde and cycloocta-2,4,6-trien-1-ylidenetriphenylphoshorane (9). Treatment of (E)/(Z)-5 88 : 12 with ethenetetracarbonitrile (TCNE) gave a complex mixture of products, from which seven mono-adducts and two bis-adducts were isolated (Sect. 2.2.1). Of
当制备1-苄基环辛-1,3,5,7-四烯(7)时,得到7-亚苄基环辛-1,3,5-三烯(5)的(E)/(Z)混合物(3:2)。通过改进的方法,在THF中用t- BuOK处理。或者,一个ca。可以在Wittig反应中制备9∶1的混合物(E)/(Z)-5,所述Wittig反应涉及苯甲醛和环辛基-2,4,6-三烯-1-吡喃基三苯膦(9)。(E)/(Z)-5的处理88:12与乙撑四甲腈(TCNE)形成复杂的产物混合物,从中分离出七个单加合物和两个双加合物(第2.2.1节)。单加合物的,四个是π 4+ π 2次加合物:二((ë) -和(Ž) -异构体)从(两种异构体的互变异构体价衍生ë)/(Ž) - 5,而它暂时建议其他两个(再次是(E)-和(Z)-异构体)是由戊二烯基两性离子的中间体形成的(2.3节)。其余三个单加合物,其中两个是差向异构体,其π8 +π2加合物。建议它们是从同向性两性离子的中间产物衍生出来的(第2