Formation, characterization, and some reactions of spiro[cyclobutane-1,1′-1′H-azulenium] ion
作者:Mitsunori Oda、Aya Sakamoto、Ryuta Miyatake、Shigeyasu Kuroda
DOI:10.1016/s0040-4020(99)00740-1
日期:1999.10
0°C; however, it underwent expansion of the cyclobutane ring at elevated temperatures to give 2,3-trimethylene-1H-azulenium cation 7. On the other hand, treatment of 6 with an excess of trityl salt gave 1-(4,4,4,-triphenylbutylidene)-1H-azulenium ion (11). The cation 4 reacted with pyrrolidine to give the adducts at their seven-membered ring carbons, which gradually rearranged to the adduct at the 2 position
1,6-二氢氮杂丙烯直接环丁基化得到螺碳氢化合物6,将其与摩尔等当量的三苯甲基盐进行氢化提取,得到标题阳离子4。得到其六氟磷酸盐,为晶体。氘代乙腈中的阳离子4在0°C下稳定;然而,它在高温下经历了环丁烷环的膨胀,得到2,3-三亚甲基-1H-az鎓阳离子7。另一方面,用过量的三苯甲基盐处理6得到1-(4,4,4,-三苯基丁烯)-1H--离子(11)。阳离子4与吡咯烷反应,在其七元环碳上得到加合物,在反应条件下,该碳逐渐在2位重排成加合物。还描述了后者加合物与乙炔二羧酸二甲酯的环加成。与三元环同系物相比,阳离子4表现出独特的化学行为。