New highly fluorinated dirhodium(II) tetrakis(alkanecarboxylates) as catalysts for carbenoid CH insertion reactions
作者:Andreas Endres、Gerhard Maas
DOI:10.1016/s0022-328x(01)01380-8
日期:2002.2
perfluoro(methylcyclohexane) and catalyze the CH insertion reaction more effectively than all other catalysts, including Rh2(OAc)4. The same two catalysts were also used to achieve 1,5-cyclization of an α-diazo-β-keto ester by intramolecular CH insertion. Unfortunately, deterioration of the catalysts occurs to a significant extent during all reactions, and therefore, the possibilities to recover and
六种高度氟化的四(烷烃羧酸盐)二氢吡啶鎓(II)[Rh 2(OOCR F)4,R F = C 7 F 15,CH 2 C 6 F 13,CH 2 CH 2 C 6 F 13,CH 2 CH 2 C 8 F 17,CH 2 CH 2 C 10 F 21和CH 2 OCH 2 CH 2 C 10 F 21制备并表征。研究了它们作为分子间类胡萝卜素CH插入催化剂的适用性,用于重氮乙酸甲酯与己烷的反应。在氟合成的框架中,只有Rh 2(OOCC 7 F 15)4和Rh 2(OOCCH 2 C 6 F 13)4是有趣的,因为它们可溶于全氟(甲基环己烷)并催化CH插入反应比所有其他催化剂(包括Rh 2(OAc)4)更有效。相同的两种催化剂还用于通过分子内CH插入来实现α-重氮-β-酮酸酯的1,5-环化。不幸的是,在所有反应过程中,催化剂的降解程度都很大,因此,回收和再利用它们的可能性相当有限。