Synthesis and Photochromic Properties of Fulgides with a<i>t</i>-Butyl Substituent on the Furyl- or Thienylmethylidene Moiety
作者:Jitsuo Kiji、Tamon Okano、Hitoshi Kitamura、Yasushi Yokoyama、Shuji Kubota、Yukio Kurita
DOI:10.1246/bcsj.68.616
日期:1995.2
as the catalyst. The reaction at 90 °C under 80 atm of carbon monoxide for 5 h directly gave both E and Z isomers of t-butyl-substituted furyl- or thienyl fulgides. The former had been reported impossible to synthesize by the Stobbe condensation. Similarly, furyl- and thienylfulgides with an isopropyl group were synthesized by this method. The fulgides were isolated by column chromatography in 37—75%
2,6,6-三甲基-5-(2,5-二甲基-3-呋喃基和-3-噻吩基)-3-庚炔-2,5-二醇在苯中在 1:1-Pd( OAc)2/I2 作为催化剂。在 90°C 和 80 个大气压的一氧化碳下反应 5 小时,直接得到叔丁基取代的呋喃基或噻吩基强酸酐的 E 和 Z 异构体。据报道,前者不可能通过 Stobbe 缩合合成。类似地,通过这种方法合成了带有异丙基的呋喃基和噻吩基硫辛酸。通过柱层析分离出产率为 37-75% 的强酸酐。叔丁基-呋喃基-和-噻吩基强酸酐的着色量子产率分别为0.79和0.73,在具有相同杂芳环的各系列强酸酐中最高。