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.

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0answers
61 views

Determining priority for a cyclic compound

I have problem in determining the CIP priorities in (S)-ketamine. What is the order of priorities for esketamine? Does the carbon bonded to the ring with chlorine have higher priority compared to the ...
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1answer
379 views

(E)-2-bromo-1,4-difluoro-3-iodobut-2-ene or (E)-3-bromo-1,4-difluoro-2-iodobut-2-ene

I am struggling with naming this structure either (E)-2-bromo-1,4-difluoro-3-iodobut-2-ene or (E)-3-bromo-1,4-difluoro-2-iodobut-2-ene. I am aiming at the question whether there is also a ...
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1answer
55 views

Determining the most stable enolic form of 1-phenylbutan-1,3-dione?

Question Which form of 1-phenylbutan-1,3-dione is more stable? Answer 3-Hydroxy-1-phenylbut-2-enone My question I've been told that between the above two, 3-hydroxy-1-phenylbut-2-enone is more ...
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1answer
165 views

Assigning E–Z configuration for alkenes with cyclic substituent groups [duplicate]

I was taught that according to CIP rules, we must check the priority order for the substituents. But how can we do the same for molecules with cyclic groups as substituents? How do we compare the ...
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1answer
33 views

Cahn-Ingold Prelog rules concerning tie breaking on second level

comparing the cahn-ingold prelog priority of the above groups, I should first compare the atoms attached to the first carbon. So we get: (A): {O,C,H} (B): {O,C,H} (C): {O,C,H} (D): {O,C,H} therefore ...
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1answer
31 views

Which has higher priority between unsaturated ring and unsaturated chain in the nomenclature of organic compounds?

According to the IUPAC rules of nomenclature, alkenes have higher priority over rings but what if the ring also contains a double or a triple bond? For eg: Is this compound going to be named as 1-(2-...
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145 views

Can cis-trans isomers have same InChI?

From all we know only tautomers should get the same InChI key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different ...
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1answer
35 views

What is the difference between an Aryl Halide and a Vinyl Halide?

Are aryl halides a type of vinyl halide? From my knowledge, when a Halogen atom is directly bonded to a doubly bonded carbon atom it is a Vinyl halide. When we look at halogen atom directly bonded to ...
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Naming of an organic molecule [duplicate]

I'm confused about the naming of this molecule, because according to PubChem the name should be 6-Ethyl-3,3-dimethyloctane. But if I consider the alphabetical order of the substituents, the ethyl ...
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1answer
64 views

In naming salicylic acid the rule is not followed. Why? [closed]

We have two compounds: 3-(Bromo)-cyclo-but-1-ene and {2-Hydroxybenzoic acid (Salicylic acid). While naming the compounds we number the rings as follows: Now the problem is that in the first compound ...
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1answer
41 views

Naming a nitrile in the middle of an aliphatic chain

What class of compounds does this belong to, if it exists; $$\ce{CH3-CH2-C\equiv N^{+}- CH3}$$ I honestly don't know if it exists; it popped up in my head while I was reading up on nitrile compounds, ...
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46 views

Decoxide vs decaoxide? [duplicate]

Now, I am doing a science worksheet and I came across an opportunity to write either "decoxide" or "decaoxide". Since the latter sounds wrong out loud, I decided to google it ...
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1answer
154 views

IUPAC name of cyclopentanol derivative

Is the name of the following compound 3-(ethenyl)-5-(prop-1-enyl)-2-(prop-1-ynyl)-4-(prop-2-enyl)cyclopent-2-en-ol? The problem I am facing is that how do I arrange 5-(prop-1-enyl), 2-(prop-1-enyl) ...
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2answers
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Enantiomers or identical structures?

What is the relationship between the following pair of molecules? Is the underlined answer correct? Explain. I'm getting mixed answers. Some say these are identical molecules. Other say these are ...
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45 views

What is a cinammyl system?

I came across this term while searching for reference in March's Advanced Organic Chemistry. It said: LAH gives significant double reduction only in cinammyl systems, for example, with PhCH=CHCOOH. ...
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40 views

What are the limitations of the D, L system and the (+), (-) system for naming organic compounds

In organic chemistry, both the D, L system and the (+), (-) system are widely used, in conjunction with the modern (R, S) system. The D, L system names an organic molecule based on the direction that ...
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1answer
328 views

IUPAC name of H[AuCl4]

Is $\ce{H[AuCl4]}$ tetrachloroauric [III] acid or hydrogen tetrachloroaurate[III]? As per the rules I have studied the latter name is correct. Then why am I getting the former name mentioned ...
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1answer
99 views

Universal symbols for molar mass, molarity, and molality

This is a really basic (perhaps trivial) question, but I just want to confirm: What are the SI symbols for molar mass, molarity, and molality? For molality and molarity, there is a difference, but I’...
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1answer
43 views

Meaning of “Nonyl-phenol 10 mole”

In my workplace we are purchasing "Nonylphenol 10 mole" and "Nonylphenol 30 mole" for use as non-ionic surfactants. At first I assumed, because of the name, that the substance was ...
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1answer
346 views

IUPAC: Would I prioritize low numbering to highest-priority group, OR try to assign lowest numbers overall?

I made up a pretty silly example of a molecule here, but I hope it illustrates my point. It is a dial, but which is the scientifically-preferred order of numbering: left to right, or vice versa? As ...
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1answer
52 views

IUPAC Nomenclature using Iso alkoxy groups [closed]

Is the name of the compound 4-isopropoxy-pentan-2-one or is it 4-(1-methylethoxy)pentan-2-one... Are both the correct "systematic" names or am I messing up:'.
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79 views

3-propyl-penta-1,3-diene vs 3-ethylidene-hex-1-ene

From the rules I know I would name the following compound as 3-propyl-penta-1,3-diene because maximum number of functional groups (double bonds in this case) are in the five numbered carbon chain: ...
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1answer
54 views

iupac name please? [closed]

I am kind of confuse here whether to number $\ce{NO_2}$ or double bond in the ring.
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105 views

What is the IUPAC name of this organic compound? [closed]

Variety is the spice of life. I have made an organic compound myself. Can you please tell me the name? I thought that the correct answer is - 3,3-dibromo-2,4-dichloro-1,4-difluoro-2,4-diiodo-1-...
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2answers
115 views

Why IUPAC name this amine is written as 2-methylpropan-2-amine and not as 2,2-dimethylethanamine? [closed]

Why IUPAC Nomenclature of following amine is written as 2-methylpropan-2-amine and not as as 2,2-dimethylethanamine?
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1answer
55 views

How to name this organic isomer compound? [closed]

The chemical formula is C10H22O. I don't know how to assign which group gets priority when it is formulated this way. I think there is an iso- or sec- involved, but I'm not sure. I've looked at other ...
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1answer
173 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 ...
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1answer
52 views

Numbering for the IUPAC name of this benzene derivative [duplicate]

My first guess was 2-chloro-4-nitrotoluene, but this was not among the choices for this question. My teacher says we will begin numbering from Cl, as halogens have higher priority than a nitro-group. ...
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2answers
36 views

What does per-O-acetylated glucopyranoside mean? [closed]

What does per-O-acetylated glucopyranoside mean? Can you please break down the roots?
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29 views

Chemical compound scaffolds name

in RDKit, there is this nice function to decompose a chemical compound into its scaffolds. Is there a way to automatically name the scaffolds? I usually search names in PubChem but this may not be ...
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1answer
143 views

What is the correct numbering & order for this molecule?

I'm having a hard time understanding why the numbering for this molecule is: 4-bromo-1-tert-butyl-2-methylcycloheptane, instead of: 1-bromo-4-tert-butyl-3methylcycloheptane. Is it just because the ...
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0answers
19 views

Nomenclature of branched alkane [duplicate]

I have a compound named 7-(2,4-dimethyl)hexyl-3-ethyl-5,9,11-trimethyltridecane. I have a few questions: why is it (2,4-dimethyl)hexyl and not (2,4-dimethylhexyl)? I asked this question because I saw ...
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2answers
134 views

What is the rationale for calling something as an 'inorganic [organic compound]'?

While studying the main groups of p-block, I have seen many compounds being labeled as an analog to some popular organic compound. For example, borazine is termed as 'inorganic benzene', while boron ...
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4answers
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Why “monoxide” but not “diodine”?

When naming compounds, sometimes when there are two vowels in a row the second is elided: this happens for example with "mono-oxide", which becomes "monoxide" instead. Why is this ...
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42 views

IUPAC Nomenclature for cyclic compounds without principal functional group [duplicate]

I am struggling naming cyclic compounds with multiple substituents and no principle functional group . If anyone can please elaborate the rules, it would be appreciated.
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1answer
74 views

How to name an alkyne with cyclic substituent?

My attempt: 1-(1-methylcyclopentyl)-3-methylpent-1-yne. Looks so messy though.
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1answer
53 views

Are there terms for ions of chlorine other than chloride?

An ion of chlorine with a charge of −1 is called a chloride ion/anion. Are there terms for other ions of chlorine, for example, $\ce{Cl+}$ or $\ce{Cl^2-}?$
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32 views

Why can't we say Dimethylbut-2-ene? [duplicate]

Considering the IUPAC rules state that you cannot extend the main chain and that carbon can only have 4 bonds, there is only one way to have two methyl groups on a but-2-ene. Therefore, why do we ...
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1answer
44 views

Naming phosphonium cations in ionic liquids

In Rennie et al., J. Phys. Chem. Lett., 2013, the following cation and anion structures are given in Figure 1. Figure 1(f) is captioned as butyltrimethylphosphonium, which seems to match the given ...
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2answers
50 views

Naming quaternary alkylammonium cations [closed]

Which is the correct name, (1) or (2), for the following cation?
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1answer
60 views

Why is it called N-Methylmethanamine? [duplicate]

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 ...
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1answer
119 views

Are CH₃COOH and HCOOCH₃ same?

Can I write the formula of Acetic acid as HCOOCH₃ or COOHCH₃ insted of CH₃COOH would they represent the same compound with same covalent bond?
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Can x = 1 for a compound of the form x-methyl-3-hexene?

I came across a question in a textbook Chemistry Live by Declan Kennedy: Draw the structural formula for the compound 1,3,5-trimethylhex-3-ene. My issue is with the 1-methyl part. Isn't this ...
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IUPAC naming of a haloalkane

The IUPAC name of $\ce{(CH3)3C-CH2-CHI-CH3}$ should be 4-iodo-2,2-dimethylpentane as we consider iodine as a substituent, and we should start numbering from that carbon which is closest to the carbon ...
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1answer
59 views

Organic Nomenclature: But-1-en-3-yne or But-3-yne-1-en [duplicate]

Just wondering whether "but-1-en-3-yne" or "but-3-yne-1-en" follows the correct IUPAC naming convention for organic molecules. I'm going through a text book that uses the former in ...
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2answers
79 views

Is 6-ethenyl-4-(prop-2'-enyl) octa-6-en-3-ol a valid name?

I recently study organic chemistry and I read a book by Sana Jamshaid. I came across this compound and I cannot understand why it named 6-ethenyl-4-(prop-2'-enyl) octa-6-en-3-ol: I understand that ...
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1answer
99 views

Nomenclature of aldehydes with double bonds and stereoisomerism

I'm struggling to name this compound shown below: I'll post my chain of thought here so it can be corrected! longest chain is marked as below: this is because the functional group with the highest ...
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0answers
39 views

Difference between calcium hypochlorite and calcium oxychloride [duplicate]

Is calcium hypochlorite different from calcium oxychloride, which is commonly known as bleaching powder; How are these different, and in general, how is hypochlorite ion chemically different from ...
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0answers
100 views

Is 18:82 a valid ratio for aqua regia?

Here it writes that nitrohydrochloric acid (possibly Aqua Regia) is of the ratio of $18:82$, which is $1:4.56$ in a simpler form. On Wikipedia and every other source i found the ratio $1:3$. So what's ...
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1answer
82 views

Nomenclature question about diols

I'm struggling to understand why the following organic compound: is named systemically as 2-ethylhexane-1,3-diol (I think its common name is etohexadiol), if the longest carbon chain in the molecule ...

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