Rational formula
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…Ethyl alcohol and methyl ether have the same molecular formula, C 2 H 6 O, but when shown by their structural formulas, they are clearly different substances. Although it is technically correct to show a compound by its structural formula, when it becomes complicated, a rational formula is used that clearly shows the types and numbers of groups that play an important role in determining the chemical properties of the compound. For example, ethyl alcohol is shown as C 2 H 5 OH, which is a combination of the ethyl group C 2 H 5 - and the alcoholic hydroxyl group -OH. … *Some explanations of terms that mention "rational formula" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…エチルアルコールとメチルエーテルとは分子式はともにC2H6Oで同じであるが，構造式で示すと異なる物質であることが明らかにされる。 化合物を構造式で表示するのが厳密ではあるが，煩雑になる場合には，その化合物の化学的性質を決めるうえで重要な役割を果たしている基の種類や数に注目して，それを明示した示性式rational formulaを用いる。たとえば，エチルアルコールはエチル基C2H5－とアルコール性水酸基－OHとが結合したものとしてC2H5OHで示す。… ※「rational formula」について言及している用語解説の一部を掲載しています。 出典｜株式会社平凡社世界大百科事典 第２版について | 情報 |
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