Δ-Keto-acid/hydroxy-lactone isomerization in some lichen depsides, depsidones and diphenyl ethers
作者:Philippe Uriac、Solenn Ferron、Philippe Jehan、Thierry Roisnel、Sophie Tomasi
DOI:10.1039/d3ob02026f
日期:2024.3.13
In some compounds in lichens, the carboxylic acid is ortho-substituted by an 2-oxoalkyl chain. This particular structure induces the existence of δ-keto-acid ka or hydroxy-lactone hl isomers, clearly identified by their NMR data and chemical properties, such as dehydration, methylation and behaviour in thermal conditions. Internal hydrogen bonding between the carboxylic acid and substituent in the
在地衣中的一些化合物中,羧酸被2-氧代烷基链邻位取代。这种特殊的结构导致 δ-酮酸ka或羟基内酯hl异构体的存在,通过它们的 NMR 数据和化学性质(例如脱水、甲基化和热条件下的行为)可以清楚地识别出这些异构体。羧酸和邻位取代基之间的内部氢键被提议作为异构化调节剂:氢键受体(OCH 3 )产生ka异构体,而利用氢键供体(OH)获得hl异构体。