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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12
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2answers
590 views

IUPAC naming for a ring system containing different ring structures

Regarding the IUPAC naming convention for compounds in which one ring is more highly $\pi$-conjugated than the other ring but contains fewer carbon atoms: I can name this compound as either: (a) 1-[...
0
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0answers
24 views

Is the correct parent chain the longer one or the one including two double bonds?

I want to know which is the correct parent chain in this compound: Is it the one inside the loop, or the longer one that includes the part to the left of the allyl group? I know that once a ...
1
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0answers
32 views

Which is the correct parent chain in this compound?

In this compound: Will the parent chain be the one inside the loop, or the longer one including the single bonds to the left of the vinyl group? I know that carboxylic acid is the highest-priority ...
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0answers
29 views
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0answers
61 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 ...
0
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0answers
35 views

Is lowest locant rule always valid? [closed]

For example, in case of 4-Bromopent-2-ene, lowest locant rule doesn't hold or else it has to be named 2-Bromopent-3-ene. Same goes for 4-Bromo-3-methylpent-2-ene : Please let me know where I am wrong....
-2
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0answers
48 views

The Systematic IUPAC name of hydrogen sulfide [duplicate]

Why the Systematic IUPAC name of $\ce{H_2S}$ is Hydrogen Sulfide and not dihydrogen sulfide? The name of $\ce{N_2O_5}$ is dinitrogen pentoxide, so why is this not the case with $\ce{H_2S}$?
0
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1answer
35 views

Alkyl halide nomenclature, flouthane [duplicate]

The IUPAC name for flouthane is 2-bromo-2-chloro-1,1,1-triflouroethane. i am confused why did not we assign the numbering to the carbon chain the other way possible that would make the name as 1-bromo-...
2
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1answer
199 views

What is the IUPAC name for this compound containing a phenyl group attached to it?

What is the IUPAC name for the compound $\ce{(CH3)3CCH2CH(Br)C6H5}$? The answer I got myself was (1-Bromo-3,3-dimethylbutyl)benzene, but from looking online most sources list the name as 1-Bromo-3,3-...
9
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2answers
471 views

What is the purpose of HFCs (Hydrofluorocarbons) numbering system?

I read that for hydrofluorocarbons, they're named HFC-xyz, where x = number of carbon - 1 y = number of hydrogen + 1 z = number of fluorine I'm curious why they were named like this. Is it better than ...
11
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1answer
467 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 ...
2
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1answer
30 views

Is diethyl and methyl preferred over an ethyl and an isopropyl group as substituents when both give the same longest chain? [duplicate]

According to what I took (look for the longest chain, start close to the branches, etc etc) I see two paths I could follow to give me a hexane. One where you go through the carbon in the methyl, and ...
1
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0answers
105 views

Using bis- over di- as multiplicative prefix in the nomenclature of urea for coordination complexes [duplicate]

The compound $\ce{[CuCl2(NH2CONH2)2]}$ is named as dichloridobis(urea)copper(II). However, why is it not dichloridodiureacopper(II)? I know that we use bis-, tris-, tetrakis- when the ligand's name ...
9
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1answer
247 views

What is the IUPAC name of perchloroisobutane?

What is the IUPAC name of $\ce{(CCl3)3CCl}?$ The answer I got was 1,1,1,2,3,3,3-heptachloro-2-(trichloromethyl)propane. But when I looked up the question online, most sources say the answer is 2-(...
-6
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1answer
48 views

How to draw the different butyl cations? [closed]

On the image , can someone help me how to draw the different butyl cations? I'm confused as to where to place the positive charge on the different butyl cations. Going from left to right, the ...
3
votes
3answers
373 views

Chiral center or not? Similar substituents, but still two possible structures!

As far as I know, the central carbon shouldn't be a chiral center because it has two identical substituents. And yet, these two compounds should be different from each other.. Is it possible to denote ...
3
votes
1answer
208 views

What is the IUPAC Name of [Cr(NH3)5Cl]Cl2.NH3? [duplicate]

What is the IUPAC Name for the complex $\ce{[Cr(NH3)5Cl]Cl2.NH3}$? I can't even find it through the internet and also by employing a find in "IUPAC's Red Book".
2
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0answers
41 views

3,4-b nomenclature for an organic compound [duplicate]

In this question, the compound below was named 1-(propan-2-yl)-1,2,3,5-tetrahydro-6H-pyrazolo[3,4-b]pyridin-6-one. I assume that we can split this into three parts. The propyl group attached to the ...
4
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1answer
93 views

Are the names for chemical elements the same in both modern Greek and classical Greek? [closed]

I am curious whether the modern Greek names for chemical elements were adopted from Classical Greek, both Latin and Classical Greek, or some international standard? I'm unsure if this is the correct ...
4
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1answer
145 views

Deciding locants of double bonds vs. other substituents

After having decided that the keto-group is the highest priority, this is a ketone. However, does the double bond become C2, or does the amino become C3? In locant placement, do we prioritize double ...
2
votes
1answer
106 views

How do you name a bicyclo compound with a fused benzene ring?

What is the IUPAC rule for naming a bicyclo compound with a fused benzene ring? Are you required to state the number of double bonds by adding something like 2,4,6-ene to the name or do benzene rings ...
1
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0answers
70 views

Determining priority for a cyclic compound [duplicate]

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 ...
8
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1answer
410 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 ...
4
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1answer
199 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 ...
1
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1answer
39 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 ...
3
votes
1answer
59 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-...
6
votes
1answer
183 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 ...
2
votes
1answer
103 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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1answer
47 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, ...
1
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0answers
47 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 ...
2
votes
1answer
161 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) ...
-3
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2answers
121 views

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 ...
0
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0answers
47 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. ...
0
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0answers
47 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 ...
4
votes
1answer
558 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 ...
2
votes
1answer
222 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’...
0
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1answer
59 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 ...
6
votes
1answer
356 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 ...
-2
votes
1answer
54 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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0answers
81 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: ...
-4
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1answer
56 views

iupac name please? [closed]

I am kind of confuse here whether to number $\ce{NO_2}$ or double bond in the ring.
3
votes
1answer
147 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-...
0
votes
2answers
198 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?
-3
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1answer
57 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 ...
4
votes
1answer
180 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 ...
2
votes
1answer
57 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. ...
-1
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2answers
40 views

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

What does per-O-acetylated glucopyranoside mean? Can you please break down the roots?
0
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0answers
33 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 ...
4
votes
1answer
162 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 ...
0
votes
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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