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作者在教学中常遇到学生就CA(美国化学文摘)中使用“指示氢”和“添加氢”命名化合物提出的问题.CA在环系(稠环和杂环)中使用指示氢和添加氢的命名方法,完善于70年代初期,既有其必然性,也十分合理.现据作者个人的理解,将有关规则简述于后,同时对国内酝酿中的相关命名原则提出修订意见,就教于同行. (一)“指示氢”(indicated hydrogen)标帜由定位号加上斜体大写字母H组成,置于环系之前以表示其饱和原子的位置.对于具有最大数目非累积双键的环系或稠合母环,常有两个或两个以上异构体使用同一名称的情况,使用指示氢,可以互相区别.例:
The author often encounters problems with teaching students about the use of “indicated hydrogen” and “added hydrogen” named compounds in CA (American Chemical Abstracts) .CA uses the indicated hydrogen and the hydrogen added in the ring systems (fused and heterocyclic) Naming method, perfect in the early 70s, both its inevitability, but also very reasonable.According to the author’s personal understanding, the rules outlined in the later, at the same time on the domestic brewing related naming principles proposed amendments to teach in the peer. (A) The “indicated hydrogen” flag consists of a positioning number plus an italic capital letter H, placed before the ring system to indicate its position of the saturated atom. For a ring system with the largest number of non-cumulative double bonds or a thick With the mother ring, often two or more isomers using the same name, the use of hydrogen, can be distinguished from each other. Example: