Reactions of guaiazulene with 2-furaldehyde, thiophene-2-carbaldehyde and pyrrole-2-carbaldehyde in methanol in the presence of hexafluorophosphoric acid: comparative studies on molecular structures and spectroscopic, chemical and electrochemical properties of monocarbocations stabilized by 3-guaiazulenyl and 2-furyl (or 2-thienyl or 2-pyrrolyl) groups
作者:Shin-ichi Takekuma、Kenji Takahashi、Akio Sakaguchi、Yoshihiko Shibata、Masato Sasaki、Toshie Minematsu、Hideko Takekuma
DOI:10.1016/j.tet.2005.07.104
日期:2005.10
hexafluorophosphoric acid at 25 °C for 30 min under aerobic conditions give (2-furyl)(3-guaiazulenyl)methylium hexafluorophosphate (5), (3-guaiazulenyl)(2-thienyl)methylium hexafluorophosphate (6) and (3-guaiazulenyl)(2-pyrrolyl)methylium hexafluorophosphate (7), respectively, in 93, 98 and 85% yields. Comparative studies on the molecular structures as well as the spectroscopic, chemical and electrochemical
在25°C六氟磷酸存在下,愈创木酚(1)与杂芳族甲醛[即2-糠醛(2),噻吩-2-甲醛(3)和吡咯-2-甲醛(4)]在甲醇中的反应在有氧条件下反应30分钟,得到六氟磷酸盐(2-呋喃基)(3-愈创木烯基)甲基(5),六氟磷酸(3-愈创木氮烯基)(2-噻吩基)甲基(6)和(3-愈创木ul烯基)(2-吡咯基)甲基六氟磷酸盐(7)的产率分别为93、98和85%。六氟磷酸甲酯5的分子结构以及光谱,化学和电化学性质的比较研究5–据报道有7个被3-愈创木氮烯基和2-呋喃基(或2-噻吩基或2-吡咯基)稳定的基团。