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一、前言许多有机化学教科书在写到脂肪酸的性质时,照例都要列出脂肪酸系列的各种物理性质数据。但对其中出现的熔点交替变化现象,即所谓锯齿规律(具有偶数碳原子的酸的熔点总是高于相邻两个奇数酸的熔点),目前国内外除有少数教科书简单提到之外,大部分教科书都没有提及这一问题。致使读者在这一饶有趣味的问题上欲弃而不舍,欲知而不能。本文拟从几个层次上对此问题作一系统介绍。
I. INTRODUCTION Many organic chemistry textbooks, when writing about the nature of fatty acids, routinely list the various physical properties of the fatty acid series. However, the phenomena of alternating melting point appeared, that is, the so-called jagged law (the melting point of an acid with an even carbon atom is always higher than the melting point of two adjacent odd-numbered acids). At present, except for a few textbooks mentioned at home and abroad, Most textbooks do not mention this issue. As a result, readers are desirous of giving up on this interesting issue. This article intends to make a systematic introduction to this issue from several levels.