互变异构体
化学
二苯甲酮
酮-烯醇互变异构
烯醇
化学位移
核磁共振谱数据库
夜蛾科
碳-13核磁共振
立体化学
核磁共振波谱
计算化学
谱线
药物化学
有机化学
物理化学
物理
植物
天文
生物
催化作用
作者
Priscilla Bento Matos Cruz Derogis,Felipe Terra Martins,Thiago Corrêa de Souza,Maria Eliza de Castro Moreira,José D. Souza Filho,Antônio C. Doriguetto,Kamila Rezende Dázio de Souza,Márcia Paranho Veloso,Marcelo H. dos Santos
摘要
Abstract This article reports the structural elucidation by IR, UV and MS spectroscopic data along with 1 H and 13 C NMR chemical shift assignments of two benzophenones isolated from the fruit pericarp of Garcinia brasiliensis Mart. (Clusiaceae): garciniaphenone, (1 R ,5 S ,7 S )‐3‐benzoyl‐4‐hydroxy‐6,6‐dimethyl‐5,7‐di(3‐methyl‐2‐butenyl)bicyclo[3.3.1]non‐3‐ene‐2,9‐dione, a novel triprenylated benzophenone; and 7‐ epi ‐clusianone, a tetraprenylated benzophenone that has already been extracted from another species of the same family. Furthermore, the keto‐enol tautomeric equilibrium at solution‐state was described for these compounds by 1D and 2D NMR spectral methods and one attempt to rationalize the different ratios between the noted tautomers was based on stereochemical features. Copyright © 2008 John Wiley & Sons, Ltd.
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