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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Parent chain of a diene
I was attending a YouTube lecture on IUPAC Nomenclature, where I found this rule while selecting the parent chain to be strange.
The answer is that the parent chain has only 4 carbon atoms. And they ...
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Systematic method to determine D/L notation of substances other than amino acids and glyceraldehyde
The fundamental rules of D/L notation, as I understand it, are as follows;
In D/L notation, a molecule is named by mapping it to glyceraldehyde.
The D/L notation is based on the stereo configuration ...
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If the substituents are distinguishable, is it possible to prioritize them using the CIP rules?
In the R/S stereochemical nomenclature,
when we try to determine the priority of substituents around a chiral carbon, are there specific examples where the ranking cannot be definie under the CIP ...
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IUPAC name of the following bicyclic / spiro compound
We have the given compound
It's IUPAC naming is more sinister than things seem.
It's not a proper bicyclic compound, or a proper spiro cpmpound either.
I could interpret the spiro compound in red, ...
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Which one should I select as the parent chain ? Blue or Black Numbered Chain [closed]
As we know that Parent Chains can be selected with highest substituents when there are no multiple bonds or functional group present in a carbon chain. But in this problem we have equal number of ...
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What is electrovalency and covalency?
I know that valence is defined in the Gold Book, and valency, electrovalency, and covalency are not defined. However, there are some terms that are confusing me. According to the given definitions, a ...
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Naming of cyclic acid anhydrides
For some cyclic anhydrides, the -dioic anhydride suffix seems to be used.
E.g. butanedioic anhydride (succinic anhydride).
How does this apply to anhydrides which are not symmetrical about the oxygen ...
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Organic Chemistry: Numeric prefix for 9 carbons doesn't follow pattern of greek numbers [duplicate]
In the nomenclature of organic compounds, a numeric prefix is used for denoting the number of carbon atoms in the main structure. From "pent" onwards, they seem to follow a pattern of greek ...
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using either 2-propanol or isopropyl alcohol for writing a report
I'm writing a report based on testing I've done on a material. I'm wondering if there is any convention on using different nomenclature for isopropanol. Which way of writing this molecule is consider ...
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Which of the following two IUPAC names would be accurate according to 1993 IUPAC rules?
I'm not looking for answers that are based on 2013 IUPAC recomendation based rules. But rather the old 1993 rules of IUPAC.
The two names are :
1.) Penta-1,2-dien-5-ol
2.) Penta-3,4-dien-1-ol
would we ...
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Aminium/Ammonium?
Chemdraw names this as 2-carboxyethan-1-aminium. Shouldn't it be ammonium? What's an aminium ion?
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What is the name of this organic birradical compound? [closed]
This compound is known as carbonyl oxide due to birradical funtional group $\ce{-COO}$ but I don't know how to name compounds with $\ce{-CH2-O-CH2-C(O)H}$ substituent. Is it a ether with aldehyde ...
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Are there common/trivial/archaic names for any of the periods of the periodic table?
There are "common names" for all of the s and p block groups of elements (alkali metals, alkaline earth metals, icosagens, crystallogens, pnictogens, chalcogens, halogens, noble gases) (...
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Are periods the horizontal numbers on the periodic table and groups the vertical numbers?
I am writing this post so that I can ensure for my upcoming SUC3U0 (Chemistry, Grade 11) course test of nomenclature is correct. It's a Review of my Grade 10 General Science Course.
My teacher stated ...
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IUPAC Name of Carbon Suboxide (C3O2)
I have searched the internet looking for the IUPAC name for carbon suboxide ($\ce{C3O2}$). Its structure is as follows:
$$
\ce{O=C=C=C=O}
$$
I did find one name here (PubChem), but as far as I know, a ...
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Can two resonance structures of a molecule have different cas numbers?
From this Wikipedia article :
Specifically, when a molecular structure is said to be represented by a resonance hybrid, it does not mean that electrons of the molecule are "resonating" or ...
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9,10-dihydro-9,10-ethanoanthracene derivatives. Stereoisomers or different compounds? What are their chemical names?
What is the relationship between these compounds? Are they stereoisomers or some of them are different compounds? Additionally, what would be their names?
(For position 9, with the methyl substituent)
...
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Class vs Functional Group: Imprecise Language?
Alcohols, carboxylic acids, esters, alkanes etc are classes of organic compounds, not functional groups, no? (alkanes contain no functionl groups!)
In other words, a class is a type of compound, while ...
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What is the correct IUPAC nomenclature for this compound?
I recently came across this type of compound, and normally, I would follow the rules I've previously learnt, which is to find the longest carbon chain that contains the highest priority functional ...
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Common name of CH2Cl2 [closed]
My book says geminal dihalide or alkylidene halide is the common name for dihaloalkanes where both halogen atoms(if of same element) are bonded to the same carbon atom and alkylene dihalide if 2 ...
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What the link between radical(root) and its meaning in chemistry inside etymology [closed]
All i know radical mean root and when i heard root all what i think about is the root in plant so what the link?
Why they chose ...
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Glutaraldehyde or Glutardialdehyde
Recently I was searching for a chemical compound to meet my research needs, i.e. glutaraldehyde, and later I found that Merck has been released different name of compound: (1) glutaraldehyde and (2) ...
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Why the common name of 1,2-dichloro-ethane is ethylene dichloride if it has no double bonds in it? [duplicate]
Why the common name of 1,2-dichloro-ethane is ethylene dichloride if it has no double bonds in it? The -ene in the common name suggests that it should have a double bond. I believe this is due to the ...
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Why does phosphinic acid not form pyroacids?
Why does $\ce{H3PO2}$ not form pyroacids? All I know is pyroacids are derived oxyacids obtained by removing one $\ce{H2O}$ molecule from two molecules of oxyacids. Correct me if this is wrong.
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Valence, Variable Valence, and Valency
As per the latest IUPAC Compendium of Chemical Terminology, informally known as the "Gold Book", the terms valency or variable valence are not defined; however, valence is defined as:
The ...
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Is HC(=NH)OH a stable compound?
The molecule $\ce{HC(=NH)OH}$ has been shown to derive from hydrogen cyanide and water (compound 7). Is it a stable compound?
source: Das, T.; Ghule, S.; Vanka, K. Insights Into the Origin of Life: ...
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Is neo-octane possible and if yes, what is its structure? [closed]
I know iso-octane is an exception and is 2,2,4-Trimethylpentane which intuitively contains both iso and Neo groups. But then what is the structure of neo-octane or even is it possible?
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What is the meaning of "proto" in nomenclature?
"Proto" is generally used to describe "first", "foremost" or "earliest form of (something)" indicating something primitive that transforms into something known ...
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What's the priority order of primary, secondary and tertiary amino groups in IUPAC nomenclature [closed]
It's a really simple question but I didn't get answer to this anywhere. What's the priority order of primary, secondary and tertiary amino groups in IUPAC nomenclature.
For example what would be the ...
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Nomenclature of Nonacyclo Compound
I can't understand which are the nine cycles in this compound. It seems to me that there are 11 faces and thus 11 cycles. And what is the numbering of the carbon?
Source: Advanced Organic Chemistry ...
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When starting a sentence with an IUPAC name that starts with a number, do you capitalize the first letter?
When you have an IUPAC name that starts with a number, i.e. "3,5-dinitrosalicylic acid", but it's at the start of the sentence would you capitalize the first letter in the name? For example:
...
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Where can I find IUPAC's official definition of "green chemistry"?
I've been looking all around, including in IUPAC's color books, but could not find a definition of "green chemistry". Additionally, Wikipedia's article on green chemistry features a sidebar ...
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Is CD4 an alkane?
Can $\ce{CD4}$ or $\ce{CT4}$ be considered an alkane?
I know that an alkane is $\ce{C_nH_p}$ where $p = 2n + 2$. An alkane is considered a "hydro"carbon, i.e., a compound containing purely ...
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What would be the correct IUPAC name of this compound? [duplicate]
How many carbon atoms will be there in the parent carbon chain? I have proposed its few names, which one is more appropriate?
4-Chloro-3-ethyl-2-(1-methylethyl)-butan-1-ol
3-(1-Chloromethyl)-2-(1-...
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Why the IUPAC naming of this compound is 6-hydroxycyclohex-2-en-1-one?
Should it not be 2hydroxycylohex-5-en-1-one?
Functional groups are usually given more priority than double/triple bonds, except in cases of Nitro, halides, etc.
Shouldn't the priority order be Ketone&...
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Protein/polypeptide nomenclature, residue number superscripted or not?
When referring to a specific residue number of a given amino acid, should the residue number be superscripted or simply affixed?
For example, When referring to a Tryptophan residue at the 147th ...
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Can you write oxidation states with negative Roman numerals?
As I understand, Roman numerals are used for oxidation states, whereas Arabic numerals are used for the charge of full ions, with some ambiguity allowed when a metal centre is all but ionised, such as ...
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3-Bromo-2-propylbutanal vs 2-(1-Bromoethyl)pentanal, which one is correct name according to IUPAC nomenclature standards and why?
In above example, What should should be the main chain. According to the IUPAC nomenclature standards whether it's name should be - (a) 3-Bromo-2-propylbutanal (b) 2-(1-Bromoethyl)pentanal
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Rules for numbering in unsaturated cyclic compounds according to IUPAC? [duplicate]
Below is a cyclic compound. What should be the numbering scheme for this compound while naming it according to IUPAC rules?
As per the lowest set of locants option one (3-Ethyl-2-methylcyclohexene) ...
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Polycyclic or heterocyclic compound naming [closed]
What is the order and name of the following polycyclic compound?
I am studying heterocyclic chemistry to teach some notions to my high school students even if it is outside curriculum (to give them ...
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How to name ether with ketone and carboxyl groups?
Carboxylic acid is the main functional group due to higher priority, but since it's an ether, what's the proper way to name the following compound?
My attempt: 2-(1-methyl oxo propyl ether) ethanoic ...
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What is the correct way to specify the weight fraction from bulk compositional data with a listed total % (e.g. from XRF, ICP)?
TL;DR = With bulk composition results, such as from X-Ray Fluorescence (XRF) testing, is the mass fraction of a given analyte that analyte given as a % or the analyte divided by the given total mass %?...
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Nomenclature of monocyclic molecule with multiple insaturation
The PIN (Preferred IUPAC Name) of this molecule
is (Z)-cycloocta-3-en-1,5-diyne, but at first I thought it was (Z)-cycloocta-1-en-3,7-diyne, following the rules of the Blue Book, P.31.1.3
Can someone ...
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nomenclature rules: lower positions for all substitute groups or consider group names first [duplicate]
Consider the naming of:
When numbering right to left, the Br will be given 3.
When numbering left to right, the Cl will be given 3.
As they are equal, should we consider their names now (Br is ...
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Why CFC naming system is so weird? [duplicate]
Why it can't be just as simple as just the number of C, H & F atoms respectively instead of (C - 1), (H+1) & F?
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Does -ate suffix mean existence of -ite oxyanions?
According to online resources oxyanions are named as
Per+element+ate eg. $\ce{ClO4-}$
Element+ate eg. $\ce{ClO3-}$
Element+ite eg. $\ce{ClO2-}$
Hypo+element+ite eg. $\ce{ClO-}$
1-If I see an oxyanion ...
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Nomenclature of an organic compound with multiple substituents
what is the IUPAC system of naming a compound with multiple substituents? I am not sure if the name should be something like 3-ethyne-1-hydroxy-5-yne-2-pentanone. This structure contains 2 triple ...
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Could you tell me the name of this compound please? [closed]
Could you please tell me make of this compound?
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What is the IUPAC name of an ether if two alkyl groups attached to oxygen atom have functional groups attached to them?
Here, both alkyl groups attatched to oxygen atom have ketone functional group attatched to oxygen. Then, how will I write the IUPAC name?
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Naming of this organic compound
I am unable to share the image, so sorry; but can you tell me which is the correct name from these 2 of the same compound.
3-(1-chloromethyl)-2-(1-methylethyl)-pentan-1-ol
or
4-chloro-3-ethyl-2-(1-...
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