Synthesis, Stabilities, and Redox Behavior of Di(1-azulenyl)(6-azulenyl)methylium Hexafluorophosphates. Generation of a Donor−Acceptor-Substituted Neutral Radical by Azulenes
作者:Shunji Ito、Takahiro Kubo、Noboru Morita、Tadaaki Ikoma、Shozo Tero-Kubota、Akio Tajiri
DOI:10.1021/jo035053o
日期:2003.12.1
Several di(1-azulenyl)(6-azulenyl)methanes and 1,3-bis[(1-azulenyl)(6-azulenyl)methyl]azulenes were prepared by the condensation reaction of azulenes with diethyl 6-formylazulene-1,3-dicarboxylate under acidic conditions. The products were converted into di(1-azulenyl)(6-azulenyl)methylium hexafluorophosphates and azulene-1,3-diylbis[(1-azulenyl)(6-azulenyl)methylium] bis(hexafluorophosphate)s via
通过天青石与二乙基6-甲酰基天青石-1,3的缩合反应,制备了几种二(1-天青烯基)(6-天青烯基)甲烷和1,3-双[(1-天青烯基)(6-天青烯基)甲基]天青烯。 -二羧酸在酸性条件下。通过与DDQ的氢化物提取反应将产物转化为六氟磷酸二(1-氮杂烯基)(6-氮杂烯基)甲基鎓和氮杂-1,3-二基双[(1-氮杂烯基)(6-氮杂烯基)甲基]双(六氟磷酸酯)s。交换抗衡离子之后。尽管天蓝色取代了天蓝色,这些单价和双价药物仍具有较高的稳定性,具有较大的pK(R)(+)值(5.6-10.1)。循环伏安法(CV)对单阳离子的电化学还原显示出可逆的两步反应,单电子还原波,其第一还原电位(E(1)(red))和第二还原电位(E(2)(red))之间的差异很小,在溶液中表现出高度两性的中性基团的生成。指示剂的电化学还原显示出伏安图,其特征在于随后的两个单电子波和CV上的两个电子转移分别归因于自由基阳离子,双自