作者:Stefan Büttner、Willi Desens、Dirk Michalik、Peter Langer
DOI:10.1002/ejoc.201100760
日期:2011.11
The synthesis and structures of fluoroalkylated triketides (3,5-dioxo esters) and 1,3,5-triketones – such as 1,1,1-trifluoroheptane-2,4,6-dione – were studied. The synthesis is based on reactions between 1,3-dicarbonyl dianions and esters. In CDCl3, the fluoroalkylated triketides exclusively exist in the forms of enol tautomers. In [D6]DMSO, equilibria between enols and keto hydrates, formed by addition
研究了氟烷基化三酮(3,5-二氧代酯)和 1,3,5-三酮(例如 1,1,1-三氟庚烷-2,4,6-二酮)的合成和结构。该合成基于 1,3-二羰基二价阴离子和酯之间的反应。在CDCl3 中,氟烷基化的三酮化合物仅以烯醇互变异构体的形式存在。在 [D6]DMSO 中,观察到烯醇和酮水合物之间的平衡,这是通过向烯醇中添加水而形成的。在 [D6]DMSO 中,1,1,1-trifluoroheptane-2,4,6-dione 和 5-chloro-1,1,1-trifluoroheptane-2,4,6-dione 仅以其环状半缩酮的形式存在. 在CDCl3 中,观察到半缩酮和三个开链互变异构体的互变异构混合物(其中二烯醇互变异构体占优势)。