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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.

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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?
Shira's user avatar
  • 451
11 votes
1 answer
249 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 ...
Parker Willett's user avatar
-2 votes
1 answer
50 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 ...
Snehal Bhadani's user avatar
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 ...
Melanie Shebel's user avatar
1 vote
1 answer
28 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 ...
Akilan SS's user avatar
1 vote
1 answer
100 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,$8$...
imrobert's user avatar
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-3 votes
1 answer
85 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 ...
i dont know how to code's user avatar
2 votes
1 answer
151 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(...
Blacklight MG's user avatar
-1 votes
2 answers
72 views

Is methylenecyclopropane a cycloalkene?

Are all compounds with a ring and double bonds considered cycloalkenes? Can the double bond be outside the ring in a cycloalkene (example: methylenecyclopropane)
EagerToLearn's user avatar
2 votes
1 answer
257 views

How to name an ester with an alkene or alkyne as the R group? [closed]

More specifically, see the image down below: Would it be pentan-2-ene-3-yl propanoate? Do you just add the 2-ene to specify the position of the double bond?
Joe Dahl's user avatar
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2 votes
1 answer
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How the tertiary carbons of cyclohexane are assigned the stereo-descriptors (r)?

We assign the stereodescriptors R and S for chiral centres - carbons and other atoms, as per the set of sequence rules (CIP rules). The pseudochiral centres are given the descriptors (r) & (s) ...
Che Mistry's user avatar
1 vote
0 answers
71 views

How to indicate that a substance is in a standard state?

An superscript circle or Plimsoll is typically used to indicate that a thermodynamic property is that of a substance in its standard state. On the other hand, when writing a chemical equation we ...
Buck Thorn's user avatar
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4 votes
1 answer
299 views

Nomenclature of C6H5CO-O-NH2

How to name the following compound using IUPAC nomenclature? I found benzyl carbamate to be very close to my structure, but couldn't find an exact compound online which matches mine.
kzmom's user avatar
  • 51
-5 votes
1 answer
101 views

What is the correct name of H2SO2? Sulphoxylic acid or hyposulphuric acid [closed]

Given the oxidation state on S, it seems the correct name should be hyposulphurous acid, but I have seen multiple sources call it sulphoxylic acid, or both What is the reasoning behind this ...
ThatApollo777's user avatar
0 votes
0 answers
33 views

Can SMILES name any possible chemical?

Similar: Does IUPAC nomenclature have the ability to name all organic compounds? - The answer to this question was no. A relevant statement from the linked, though it is not explained: The closest ...
imrobert's user avatar
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-4 votes
1 answer
43 views

What do the dots mean in DABCO's IUPAC name? [duplicate]

I came across this molecule with the following IUPAC name: 1,4-Diazabicyclo[2.2.2]octane What do the dots inside the brackets mean, or where can I read about the IUPAC guidelines that require this?
imrobert's user avatar
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1 vote
1 answer
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What is the priority of an alkyl substituent containing double or triple bonds, in comparison to the other functional groups?

If we have an alkyl substituent containing a double bond(s) or triple bonds(s), what is it's priority in comparison to other functional groups and substituents? For example, take the compound given ...
Bongo Man's user avatar
  • 371
-2 votes
1 answer
79 views

Translation of ferric and ferrous to German

I am not sure if this question belongs to the Chemistry or German forum. My question is basically in the title. Are there good translations of ferric and ferrous to German which retain the meaning of ...
mcocdawc's user avatar
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3 votes
0 answers
37 views

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 ...
Blue Various's user avatar
3 votes
1 answer
144 views

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 ...
Blue Various's user avatar
2 votes
1 answer
77 views

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, ...
Bongo Man's user avatar
  • 371
0 votes
0 answers
125 views

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 ...
ananta's user avatar
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1 vote
1 answer
131 views

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 ...
brainfreeze's user avatar
1 vote
0 answers
39 views

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 ...
L. von W.'s user avatar
  • 111
0 votes
1 answer
42 views

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 ...
Stephanie's user avatar
1 vote
1 answer
72 views

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 ...
aspirant 720's user avatar
1 vote
0 answers
122 views

Aminium/Ammonium?

Chemdraw names this as 2-carboxyethan-1-aminium. Shouldn't it be ammonium? What's an aminium ion?
Arbish Ali's user avatar
4 votes
2 answers
736 views

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) (...
Anonymous's user avatar
-3 votes
3 answers
416 views

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 ...
Abdullah's user avatar
5 votes
0 answers
151 views

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 ...
Chinmay Krishna's user avatar
0 votes
0 answers
60 views

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 ...
user6376297's user avatar
-1 votes
1 answer
27 views

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) ...
Levis_olympus's user avatar
6 votes
2 answers
540 views

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 ...
Cheng's user avatar
  • 494
7 votes
1 answer
773 views

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 ...
DeadAndAliveCat's user avatar
-4 votes
1 answer
310 views

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 ...
Nipun Kulshreshtha's user avatar
-3 votes
2 answers
164 views

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 ...
Pcp115's user avatar
  • 115
3 votes
1 answer
113 views

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) ...
Muhammad Ihsan's user avatar
0 votes
2 answers
167 views

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 ...
SirMeowsers's user avatar
6 votes
1 answer
482 views

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.
Mathlover12345's user avatar
3 votes
0 answers
126 views

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 ...
ananta's user avatar
  • 2,299
4 votes
2 answers
760 views

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: ...
nightcod3r's user avatar
-4 votes
1 answer
644 views

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?
S K's user avatar
  • 33
5 votes
1 answer
182 views

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 ...
Nilay Ghosh's user avatar
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-4 votes
1 answer
111 views

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 ...
Valoruz's user avatar
  • 89
0 votes
1 answer
84 views

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 ...
Sarban Bhattacharya's user avatar
10 votes
1 answer
2k views

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: ...
o'leary's user avatar
  • 111
4 votes
1 answer
165 views

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 ...
GPWR's user avatar
  • 151
1 vote
1 answer
167 views

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 ...
CHEMUMAN's user avatar
0 votes
0 answers
63 views

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-...
Dheeraj's user avatar
0 votes
0 answers
96 views

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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