The IUPAC name of $(\text{CH}_3)_2\text{NH}$ is N-Methylmethanamine according to PubChem. Shouldn't the locant N- be dropped, given that there is no ambiguity over where the substitutent methyl may be located? (If it were attached to the carbon atom, the IUPAC name of the compound would be Ethanamine).

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    $\begingroup$ Related: My answer to a different question $\endgroup$
    – Loong
    Commented Dec 31, 2020 at 17:36
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    $\begingroup$ I think we should always keep questions even if they seem related. If the question is duplicate then the community will mark it. If it's not duplicate I would humbly suggest that it shouldn't be deleted after being answered. This way firstly contributors earn rewards, secondly the people trying to search about related topics on the internet would be able to find an answer quickly. $\endgroup$
    – Desai
    Commented Dec 31, 2020 at 18:08
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    $\begingroup$ @Desai That is my intuition too. However, it is beneficial for the community if questions have accepted answers. My question is more along the lines of, would Loong write an answer here or should I answer my own question with a link pointing to Loong's older answer. $\endgroup$ Commented Dec 31, 2020 at 18:11
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    $\begingroup$ You can do it yourself, just make sure that you credit @Loong properly with a link to the answer and a mention! $\endgroup$ Commented Jan 1, 2021 at 7:21
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    $\begingroup$ Does this answer your question? IUPAC rules on omission of locants in carboxylic acid $\endgroup$
    – cngzz1
    Commented Jan 3, 2021 at 1:51

1 Answer 1


It is according to IUPAC rules that while naming alkyl substituted amines, we add a prefix of N before it. In this case also, it is the same... nevertheless, your reasoning of no ambiguity over dropping the prefix N is correct, but the name would not be Methylmethanamine (incorrect), instead it would be dimethylamine which is also correct.

  • $\begingroup$ Thank you for your answer. I know that dimethylamine is the common name for the compound, but my question was specifically why Methylmethanamine is the wrong IUPAC name. $\endgroup$ Commented Dec 31, 2020 at 17:13

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