Abstract: This paper focus on the comparison between the 13C NMR chemical shifts meas-ured (δmes) wlih those calculated (δcal) by Savitsky additivity rule of 23 depsides; the discuss in of the effects of substituted group and substituted position in substituted benzenes of the depside; and the predict rule for assinging the chemical shifts in substituent benzenes of the depside.

Key words: Lichen

摘要： 本文将23个缩酚酸的13C NMR谱的化学位移实测值(δmes)与根据Savitsky 规则计算得到的化学位移计算值(δcal)相比较，讨论苯环上各种取代基和取代位置对苯环碳的化学位移(δ)值的影响；同时得出一些对该类化合物苯环碳的δ值指定有帮助的规律。

关键词: 地衣, 缩酚酸, 苔黑酚型, β-苔黑酚型, 13C NMR, 化学位移