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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35 views

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

From the rules that I know, I will name the above 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
37 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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1answer
68 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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3answers
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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
53 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
124 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
44 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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37 views

Nomenclature when esters are a substituent

I came across the above compound and found its name to be 2-Methoxy carbonyl ethanoic acid. This tells me that there are 2 carbons in the parent chain, one being of COOH because of higher priority ...
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2answers
32 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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0answers
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
116 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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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
132 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
55 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
48 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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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
40 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
48 views

Naming quaternary alkylammonium cations [closed]

Which is the correct name, (1) or (2), for the following cation?
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1answer
57 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
102 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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57 views

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
56 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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1answer
45 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
83 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
24 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
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Is 18:82 a valid ratio for Aqua Regia/(s)(nitrohydrochloric acid)? Source below

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
65 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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1answer
75 views

Why can't cyclohexylbenzene be called benzylcyclohexane? [closed]

The following structure represents the compound cyclohexylbenzene: Why can't the benzene ring be treated as a substituent and the compound be called benzylcyclohexane?
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2answers
144 views

IUPAC name of aldehyde with two functional groups

I am confused as to what suffix to use for the following compound: Should it be carbaldehyde or just -al, like should it be propane-1,2-dicarbaldehyde or should it be propan-1,2-dial? Or maybe it's 1-...
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2answers
61 views

“Bromobenzene” vs “bromophenyl” [duplicate]

What is the difference between the keywords Bromophenyl and Bromobenzene used in organic chemistry.
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103 views

The best way to designate unsaturation (double bond)

Although it has already been explained here that the use of the "Δ" (Greek capital delta) character is not recommended to designate unsaturation in individual names, IUPAC 1989 Nomenclature ...
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1answer
100 views

What nomenclature do names like fumarate and malate derive from?

When reviewing the citric acid cycle, I find names like glutarate and succinate to be helpful in thinking about the structure of the molecules because I was taught about the sequential dicarboxylic ...
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2answers
83 views

IUPAC nomenclature of cycloalkadienes with substituents and alkenes on the same carbons

Consider the following organic compounds: Compound $(1)$ has two double bonds, which I'll label $C1$ and $C4$ such that the methyl group is attached to $C1$ and thereby assign lowest numbers to all ...
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1answer
73 views

Selection of parent carbon chain for IUPAC naming [closed]

How to select the parent carbon chain for IUPAC naming of following compound? I think the red numbering is correct, but in the answer key, they have used the blue numbering. Which is correct? My ...
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Why is Tyrian purple called 6,6′-dibromoindigo?

If the two bromines are attached at opposite ends of the molecule, why are they both labelled with a 6? Also, why is 6,6′-dibromoindigo not called 1,1′-dibromoindigo if carbons in a ring are numbered ...
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1answer
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What does the number 4-88 mean in “Polyvinylalcohol 4-88”?

Polyvinylalcohol is sold in different forms, one of those is 4-88. What does that number mean?
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0answers
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Can someone help with the nomenclature of this metal complex. MarvinSketch is giving me trouble

I’m trying to get a name for the structure above using MarvinSketch for my undergraduate senior thesis. This is the first time I’ve had to draw a metal complex in MarvinSketch, and I’m having trouble ...
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0answers
70 views

Coordination compound nomenclature for [Cu(acac)(bpy)]BPh4

The title says it all really. I thought it would be acetylacetonatobipyridinecopper(II) tetraphenylborate. Is this correct? I feel as though it looks a bit clumsy and wasn’t sure if I was supposed to ...
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38 views

Naming a cyclic organic compound with multiple functional groups [duplicate]

Why the IUPAC name of the compound is 5-hydroxycyclohex-3-en-1-one and not 3-hydroxycyclohex-4-en-1-one?
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2answers
184 views

What should be the nomenclature of this organic compound?

I am confused with my teacher's explanation for the nomenclature of this organic compound. He said that we should start numbering from the sulphonic acid at the bottom of the structure. But one of ...
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1answer
48 views

Is the precedence of functional groups used in IUPAC naming arbitrary?

There seems to be a priority order that has to be followed while naming an organic compound with more than one functional group , according to IUPAC rules. I want to know if there is a basis on which ...
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3answers
242 views

What does *oxidizing* have to do with *hydrogen*? [closed]

An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. All Brønsted acids can act as oxidizing agents, because the acidic proton can be reduced to hydrogen gas. (source: Wikipedia) ...
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1answer
219 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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1answer
58 views

Should equiatomic iron–cobalt alloy be written as FeCo or CoFe?

I have an alloy made of 50% iron and 50% cobalt. I see occasionally in the literature this is written as FeCo alloy. But shouldn't it be CoFe alloy since the chemical symbols are supposed to be ...
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0answers
43 views

The reason behind the alphabetical order in nomenclature [closed]

I hope my question is not too dumb but hey I am learning from the beginning so when we have a compound such as 6-ethyl-3methylnonane, obvioysly we arrange the alkyl groups alphabetically. Then if we ...
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1answer
72 views

IUPAC Nomenclature of a dioic acid

I have to name the following organic cpd according to IUPAC. My attempt: I am unable to select a parent carbon chain as there are 2 carbon chains possible and I don’t know how do we proceed in such a ...
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2answers
979 views

What is the name origin of ester?

Ester is quite a random nomenclature for a compound derived from a parent acid and parent alcohol. Is there any reasoning behind using the word 'ester' to name such compound (for memorising purpose)? ...

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