Department of Chemistry, Trinity University, One Trinity Place, San Antonio, Texas 78212, United States.
Department of Paleobiology, National Museum of Natural History, Washington, D.C. 20560, United States.
J Nat Prod. 2021 Sep 24;84(9):2511-2524. doi: 10.1021/acs.jnatprod.1c00522. Epub 2021 Sep 7.
The class of plant exudates that contain the phenol functionality, termed , is defined, surveyed, and characterized by solid-state C NMR spectroscopy and by solution-state H NMR spectroscopy. Materials in this group are identified by the phenolic C resonance (from the ipso carbon of ArOH) at δ 145-160 (δ 160-167 for ArOR). The resonance patterns define several subclasses based on the collective similarity of their C spectra, specifically, aloetics from the genus , guaiacs from the genus and other eurosid and conifer genera, xanthics from the genus , and kinos from the genus and many other genera. Phenolic exudates often are mixed with terpenoid materials (the building block of exudates known as ) and carbohydrates (the building block of exudates known as ) to form hybrid subgroups such as guaiac gums, guaiac resins, and kino resins. There are numerous phenolic exudates not affiliated with any of these groups, both as pure phenolics and as hybrids (phenolic resins, phenolic gum resins, and phenolic waxes).
本文定义、调查和描述了含酚官能团的植物分泌物类别，称为，通过固态 C NMR 光谱和溶液态 H NMR 光谱进行了表征。该类物质的特征是酚 C 共振（来自 ArOH 的对位碳）位于 δ 145-160（对于 ArOR 为 δ 160-167）。共振模式根据其 C 谱的集体相似性定义了几个亚类，具体来说，来自属的aloetics、来自属的guaiacs 和其他 eurosid 和针叶树属、来自属的xanthics，以及来自属的 kinos 和许多其他属。酚类分泌物通常与萜烯类物质（已知的分泌物构建块）和碳水化合物（已知的分泌物构建块）混合形成杂种亚群，如guaiac 胶、guaiac 树脂和 kino 树脂。有许多与这些类别都没有关联的酚类分泌物，既有纯酚类，也有杂种（酚树脂、酚胶树脂和酚蜡）。
