Unexpected Diels–Alder reaction of [60]fullerene with electron-deficient ferrocenes as cyclopentadiene surrogates
作者:Zhan Liu、Zheng-Chun Yin、Wen-Qiang Lu、Dian-Bing Zhou、Guan-Wu Wang
DOI:10.1039/d1cc05749a
日期:——
The unexpected Diels–Alder reaction of [60]fullerene (C60) with ferrocenes bearing electron-withdrawing groups as cyclopentadiene surrogates has been developed to selectively afford single isomers of [2 + 4] cycloadducts of C60. Mechanistic studies indicate that cyclopentadienes are in situ generated from electron-deficient ferrocenes in the presence of an oxidant and an acid, followed by [2 + 4] cycloadditions
[60] 富勒烯 (C 60 ) 与带有吸电子基团的二茂铁作为环戊二烯替代物发生了意想不到的 Diels-Alder 反应,以选择性地提供 C 60的 [2 + 4] 环加合物的单一异构体。机理研究表明,在氧化剂和酸的存在下,环戊二烯是由缺电子的二茂铁原位生成的,然后与亲二烯体发生 [2 + 4] 环加成反应。使用格氏试剂的迈克尔加成反应已被用于将 C 60的狄尔斯-阿尔德加合物转化为更稳定的富勒烯衍生物。
Preparation of ferrocenyl mono- and dienone derivatives through aldol condensation of 1,1′-diacetylferrocene with aromatic aldehydes in dry conditions
作者:Wan-yi Liu、Qi-hai Xu、Bao-hua Chen、Yong-min Liang、Yong-xiang Ma、Wei-min Liu
DOI:10.1016/s0022-328x(01)00927-5
日期:2001.12
1,1′-Diacetylferrocene was condensed with aromatic aldehydes without solvent in the presence of solid NaOH. Diacetylferrocene can give good yields of mono- or diene with either one or two molecules of a wide range of aldehydes depending only on the stoichiometry. Cyclization to ferrocenphane does not occur in this condition.