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Questions tagged [nomenclature]

This tag should be used for questions about the naming of compounds and elements, usually using systematic names according to IUPAC recommendations, but also using retained traditional names.

-2 votes
0 answers
44 views

How to name HOOC-CH2-(C=O)-O-CH2-CH3?

How do we name the following compound according to IUPAC? I do not have clearance on how to name Ester[R(C=O)-OR]'s prefix (like when are we supposed to use Alkoxy carbonyl, or Alkanoyl oxy) so if ...
-3 votes
0 answers
17 views

Usually double bond gets preference in numbering but what if triple bond is in a cyclo chain with more carbon atoms in cyclic part than in acyclic [closed]

I don't have anything to add, I am imagining a ring with four C atoms and a triple bond attached to a open chain with only 3 C atoms but with a double bond.
1 vote
0 answers
55 views
+50

Correct interpretation of Impedance: IR-Drop and Nyquist plots

Good day guys, I have been lately studying impedance and IR drop in electrochemical systems. From my readings I have come across different interpretations. According to my books, from the Nyquist plot:...
-2 votes
0 answers
21 views

Doubt related to IUPAC nomenclature and RCOOX functional group [duplicate]

Does this compound exist? If yes, then what will be its IUPAC name? Also, what is the RCOOX functional group called?
23 votes
1 answer
2k views

What does the newest IUPAC nomenclature have against unsaturation?

IUPAC nomenclature 2013 changed a couple of rules very commonly used in naming simple acyclic compounds. As a result, depending on which nomencalture we choose, the answer to this question varies ...
0 votes
0 answers
38 views

How to identify whether given element is meta(-ate) ion or meta(-ite) ion? [duplicate]

Like why $\ce{PbO3-}$ is a meta plumbate anion because definition of meta(-ate) ion is that it has maximum oxidation state of Pb by using minimum oxygens. But in this case how oxidation state of Pb is ...
13 votes
2 answers
1k views

Does folic acid contain a benzyl or a phenyl group?

I'm studying for my MCAT currently and I stumbled upon this question. It gives the structure of a folic acid molecule and asks what functional groups can be found within the molecule. I understand ...
5 votes
1 answer
432 views

Is cyclohexane‐1,3‐dicarboxylic acid a correct IUPAC name?

I did the numbering by taking all the functional groups in principal chain (scheme A), but my teacher did it differently and proposed the name cyclohexane‐1,3‐dicarboxylic acid (scheme B): The ...
14 votes
3 answers
5k views

Why is it ACETone?

'Acet-' indicates ethyl, but does not offer two carbon atoms, but three. Acetaldehyde is ethanal, acetic acid is ethanoic acid, but acetone is propanone (yes, I'm aware that there is no ethanone). Why ...
7 votes
4 answers
2k views

The nomenclature of mineral acids

My basic knowledge about nomenclature is: A mineral acid is called hypo when it has one less oxygen than the original one, a pyro acid when 2 molecules of acid add up with release of $\ce{H2O}$ a ...
1 vote
0 answers
53 views

Selection of parent chain in a halogenated compound with double and triple bonds

We were asked to select the parent chain for naming the halogenated compound containing double and triple bonds: My teacher told me that we choose the orange (1) one over the blue one (3) because as ...
2 votes
1 answer
1k views

Meaning of Cu1.5Al in Cu-Al phase diagram (I understand all other indexes incl. fractions like Cu0.75Al0.25)

I understand Cu0.75Al0.25 - that's just 75% Cu, 25% Al. I understand integer indexes - that's a normal chemical formula after all. However, I have no idea how to interpret Cu1.5Al, I've never seen a ...
5 votes
1 answer
331 views

why is alpha-linolenic acid "alpha"?

I'm learning about how fatty acid names are formed. In the process, I noticed a molecule called alpha-linolenic acid. There's a similar molecule called linoleic acid. Both have 18 carbons, but alpha-...
6 votes
1 answer
126 views

Who defines the nomenclature of chemical elements in German?

I'm seeking the document which mentions the names of chemical elements in German. Some of them were changed in the past (e.g. Jod to Iod for iodine). IUPAC defines the standard name of elements for ...
0 votes
0 answers
44 views

Naming alkanes with two branches in symmetrical positions [duplicate]

When naming an alkane with two substituents (e.g. methyl and ethyl branches), the carbon atoms in the main chain need to be assigned to lowest numbers possible. In the example in this link, why is the ...
3 votes
2 answers
83 views

Why is this amine called this way?

I used a molecule drawing app to name the compound in the image, an amine. The name of the compound is 3-(aminomethyl)hexane according to the app. Shouldn't the name be 2-ethylpentan-1-amine? The ...
12 votes
3 answers
989 views

What word is to chalcogen and pnictogen as halide is to halogen?

Would "chalcide" be understood as a group 16 dianion (and something less electronegative)? Would "pnictide" be understood as a group 15 trianion (and something less electronegative)?
6 votes
1 answer
2k views

What should be the IUPAC name of [(NH3)5Co-NH2-Co(NH3)4(H2O)]?

What should be the IUPAC name of $\ce{(NH3)5Co-NH2-Co(NH3)4(H2O)]}$? This is similar to $\ce{[(NH3)5Co-NH2-Co(NH3)5](NO3)5}$, i.e. μ-amido-bis[pentaamminecobalt(III)] nitrate. But the two parts are ...
11 votes
2 answers
4k views

How can I draw 2,3-diethylheptane?

This question was given by my teacher in class: Draw the structure of 2,3-diethylheptane. So I drew the following: But now if I name the compound according to the longest chain, it comes out to ...
-3 votes
1 answer
53 views

Organic compound nomenclature

As I learn nomenclature, I was told that -OH has higher priority than alkene. However, the last compound says otherwise. What is the key here?
10 votes
1 answer
282 views

How to apply the Cahn–Ingold–Prelog priority rules to an isotopically-labeled molecule?

Is the following the correct designation (S) for the chiral carbon in a skeletal representation of 1-chloro(3-13C)butan-2-amine? The CIP rules say to go one at a time by each rule until you find an ...
-2 votes
1 answer
59 views

Why is o used for hydroxy groups in IUPAC naming instead of saying 2-hydroxy [closed]

For this question, i marked compound II correct as 2-methylbenzaldehyde and got the question correct, but for compound I, i marked it wrong and suggested the name to be 2-hydroxybenzaldehyde. I got ...
11 votes
1 answer
1k views

Are CAS numbers considered proprietary?

I’m interested in working with a large dataset consisting of CAS numbers and each corresponding molecule/chemical unit’s name. From my understanding, CAS Registry Numbers are assigned and stored by a ...
7 votes
1 answer
438 views

How did Halogens become known as Halogens? They are not the only elements that form salts!

Having never given it a though before, I recently discovered (in a different context) that the prefix halo- actually means 'salt' or 'sea' and the suffix -gen means 'to form' or 'to generate'. So the ...
1 vote
1 answer
34 views

Nomenclature for 5-Methylhepta-1,3,6-triene

I was practicing writing nomenclatures for several organic compounds with the help of Blue Book Essentials and I have some queries regarding the following structure: According to the blue book, the ...
1 vote
1 answer
109 views

How do I number the atoms in strychnine?

I know the basics of naming organic molecules, but this one is a bit more complex than I'm capable of. How can I number the atoms in strychnine? Systematic IUPAC name: ($4$bR,$4$b$^1$S,$7$aS,$8$aR,$8$...
-3 votes
1 answer
90 views

Can someone help me name this molecule? [closed]

I'm having a hard time deciphering it's IUPAC name like I have 4-butanoxy and 3-propanoxy so far, but how do you put it all together with the double-bonded oxygen? Thank you and really sorry for the ...
2 votes
1 answer
159 views

How to name LiN(CF2SO3)2?

I found this compound in the list of inorganic lithium salts from this article on ScienceDirect. It is said to be of the sulfonate group. Let's focus on the anion alone. I'm not sure if it can be bis(...
3 votes
2 answers
855 views

Confusion in the name of this organic compound

I think the name of the above compound should be 3-Ethyl-2-methylcyclohex-1-ene. However, according to my book (Organic Chemistry Resonance DLPD, page #43, question #5), this organic compound is 6-...
1 vote
2 answers
5k views

Naming and structure of PtCl4.2HCl (complex/coordination compound)

Given that $\ce{PtCl4.2HCl}$ when reacted with excess of $\ce{AgNO3}$ produced zero moles of $\ce{AgCl}$, I understand that all the chlorine atoms are inside the coordination sphere. But what will the ...

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