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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36 views

How is the chirality of sidechains written in the IUPAC name?

I circled what I believe to be the chiral centers and I added the locants for the longest carbon chain. One of the chiral centers is in a side chain, so that carbon doesn't have a locant. How should ...
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1answer
37 views

What will be the name of CH2=CH-O-CO-CH3?

We have this question in the textbook but there is no answer given and I have no idea how to name this compound. Edit: I tried naming the compound. Correct me if I am wrong here 1-Methylpropenoate
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1answer
30 views

Naming a coordination compound

I was asked to determine the coordination compound which has the name: $$\text{triamminetrinitritocobalt(I)}$$ I thought it must be: $$\ce{[Co(NH3)3(ONO)3]^2-}$$ The $-2$ charge can be deduced by ...
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What is the distinction between alkyloxy and alkoxy prefixes, if any?

The IUPAC nomenclature guidelines reference alkyloxy and alkoxy prefixes at different points. Is there any distinction, at the level of a principle or rationale, between the use cases for the two? For ...
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1answer
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Can butan-1-ol be written as butanol, and is it connected to butan-1-ol having Isomers? [closed]

Can butan-1-ol be written as butanol, and is it connected to butan-1-ol having Isomers?
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1answer
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How does the sec-pentanyl group look? [duplicate]

I'm starting the very basics of hydrocarbons and I'm having a hard time at understanding when to use the common/trivial name prefixes (sec-, iso-, neo-, etc.). One particular problem is the ...
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1answer
46 views

What should be the name of the given compound?

Following compound is named as (1) 6-Mercaptocyclohex-4-ene-1,3-diol (2) 1-Mercaptocyclohex-2-ene-4,6-diol (3) 1-Mercaptocyclohex-5-ene-2,4-diol (4) 4-Mercaptocyclohex-2-ene-1,5-diol ...
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1answer
67 views

What is the IUPAC name of the given compound?

IUPAC name of the given compound is (1) 3-Hydroxycyclohex-4-en-1-one (2) 5-Hydroxycyclohex-3-enone (3) 5-Ketocyclohex-2-enol (4) 3-Ketocyclohex-5-enol By what I understand by ...
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What should be IUPAC name of given compound (see image)? [closed]

I think the name should be 1-carbamoylpentane-3-sulphonic acid, but the answer sheet mentions it as 2-carbamoylpentane-3-sulphonic acid: Can anyone please explain why the chain starting with methyl ...
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What is the name of the glyoxal radical after removing two hydrogen atoms?

What is the name of the radical that results from removing two hydrogen atoms from glyoxal ($\ce{CHO-CHO}$)? It has a roughly this structure: $$\ce{O=C^.-C^.=O}$$ It is an important intermediate in ...
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33 views

Isomerism and namegiving

Is this the right chemical formula of the $\ce{Rb[Pt(NH3)Br2Cl]}$ complex: rubidium amminedibromidochloridoplatinate(II)? And is it correct that it has geometric isomerism, being square planar with a ...
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Does sulfoxide H₂SO exist?

The question Does H2SO or H2CO have a higher dipole moment? left me wondering whether $\ce{H2SO}$ has already been synthesized. There are experimental evidences that both hydrogen thioperoxide $\ce{...
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Formic Acid vs Formica - Which came first?

Source: Google(Oxford) So, we know that 'Formic Acid' was derived in formic acid in the late 18th century from the Latin word 'formica'. From Wikipedia: Formica is a genus of ants of the family ...
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Is there a free, super simple app or website for IUPAC names from structures?

I am looking for a free, very simple tool for IUPAC names of organic molecules. I teach high school chemistry, and it would be fantastic to have an app or web tool that students could use to draw ...
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Confusion with IUPAC naming of Morphine

I'm having trouble understand what sections of the molecule morphine relate to what sections of its corresponding IUPAC name of (4R,4aR,7S,7aR,12bS)-3-methyl-2,4,4a,7,7a,13-hexahydro-1H-4,12-...
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How can I know which way to number the carbon atoms? [closed]

Please help me, I don't know which is the "first" one and what rules apply here...
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1answer
91 views

Selection of parent chain (IUPAC nomenclature)

In the given compound, there are (apparently) two possibilities of choosing the parent (main) chain for its nomenclature in accordance with IUPAC rules: (A) being the one containing 4 carbon atoms ...
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1answer
367 views

Chain with double bond or triple bond

In this hydrocarbon there can be two main chains: one with two double bonds and one with a double and a triple bond Both main chains contain seven carbon atoms. Which will be considered correct and ...
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Naming of a dispiroalkane compound

Did I name it right?? Please help me in naming dispiro compounds
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0answers
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Name of “the” benzodiazepine

Wikipedia has a thorough article on the benzodiazepines. Of course, it is written primarly from the pharmacological point of view; but there is also the "Chemistry" section, which includes the IUPAC ...
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42 views

Does space in between have any significance in IUPAC nomenclature?

The correct IUPAC name of the following compound is: (a) 2,4,6-trimethyl cyclohexanone (b) 1,3,5- trimethyl benzophenone (c) trimethylcyclobutanone (d) 2,4,6-trimethylcyclohexanone I ...
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How do I name a substituent which is a cycloalkane which is attached by a chain of more than one carbon?

Above is a picture of an alkane. How would I name this using IUPAC rules? I understand how to name other substituents such as (1,1-dimethylethyl) and some other methyl groups, but I don't know how to ...
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1answer
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is 6-benzylhexanoic acid the same as 7-phenylheptanoic acid? [closed]

is 6-benzylhexanoic acid the same as 7-phenylheptanoic acid? If the two compounds stated are equal, what's the more preferred IUPAC name?
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Is prefixes such as di-, tri-, etc. considered for alphabetical order in IUPAC nomenclature?

The correct IUPAC name of a compound was: 4-(1,1-dimethylethyl)-5-ethyloctane. my question is why not 4-ethyl-5-(1,1-dimethylethyl)octane? Are prefixes such as di-, tri-, etc. considered for ...
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How to decide whether to pick 4-bromo-2-methoxyphenol or 4-bromo-6-methoxyphenol as the name for the compound? [closed]

Why is the following compound named as 4-bromo-2-methoxyphenol and not 4-bromo-6-methoxyphenol? Shouldn't the substituents be numbered according to their alphabetical order?
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What is “super” in superphosphate?

This question is inspired from a previous question(marked unclear). I don't know about the context of that question but I was intrigued by a statement in that question: Superphosphate is used ...
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3answers
933 views

What does a comma signify in inorganic chemistry?

$\ce{(Ca{,}Co)CO3}$ I have never ever seen this before. What does this mean exactly?
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What does a simple or a complex substituent mean? [duplicate]

I am reading rules for IUPAC Nomenclature. The following statement is from my book. Prefixes di, tri, tetra, etc., are not considered in deciding alphabetical order for simple substituents but ...
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1answer
50 views

What is a “ynoate” in the context of alkynes?

In the literature, I have read the term, "ynoate" refer to a sort of alkyne. Searching through the IUPAC gold book and Google has failed to return an explicit definition.
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Use IUPAC system to name the structural diagram below

Can someone break down the steps for naming $\ce{CH3-C(Cl)=C(Cl)-CH2-CH3}$?
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How do you name this compound using IUPAC system (including steps)?

And including stereochemistry (cis trans or R S ) I know you start numbering from the double bond because there are no functional groups like -OH, you take the longest carbon chain which is six ...
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Is chlorophenylmethane the correct IUPAC name rather than chloromethylbenzene?

I thought that the correct IUPAC name for the molecule below (benzyl chloride) would be chloromethylbenzene because the ring always gets priority over the chain unless a primary functional group is ...
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231 views

Prime in substituted benzene

I was sent data for a molecule referred to as 1,2'-bis(4-aminophenoxy)benzene. I haven't been able to figure out if that is a real molecule. If I drop the prime, I know 1,2-bis(4-aminophenoxy)benzene ...
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1answer
518 views

Difference between oxo and formyl

What is the difference between oxo and formyl? both represent aldehyde when used as a substituent(correct me if I am wrong). But when should I use formyl and when oxo? This answers my problem and ...
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Priority to longest carbon chain or double bond? [duplicate]

Priority to longest carbon chain or double bond? Above structure and its nomenclature is given in my notes. However, I suspect it is wrong because the Carbon chain of 8 instead of 7 is available. So ...
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1answer
135 views

Synthases vs Lyases - nomenclature

Lyases are a class of enzymes that break down (lyase: ly- = lysis, -ase = enzyme) bonds like $\ce{C-C, C-S}$ and so on (except hydrolysis), and can eliminate molecules like $\ce{H2O}$ or $\ce{CO2}$. ...
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What is “dot” sign in •NO?

What is "dot" sign in •NO? I know that it is radical nitric oxide, but I don't know if it is necessary to put the "dot". Is there any difference between •NO and NO?
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Cahn–Ingold–Prelog Rules, cyclic structures, and breaking ties

(3S,5R)-3-ethyl-5-methylcyclohex-1-ene Does anyone know how one reaches the conclusion that the 5C is R? I tried using the Cahn–Ingold–Prelog priority rules but kept getting confused. From chem....
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Why should ether O be named as OXA in a bicyclo ring when it is a substituent?

I was asked to name the molecule below . For the following molecule, since ether is a substituent here (keto is more prior group) my answer was: 3-methoxy-6-methy-7-oxy bicyclo[2.2.1]hept-5-en-2-one ...
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1answer
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Nomenclature of simple molecules [closed]

I'm from Slovakia, 16, and I'm really confused about the English simple molecule (oxides, hydroxides, salts, acids) nomenclature. I guess we do it differently. To sum it up: we have suffixes from 1-8 ...
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Naming this iron complex: Fe2Cl6[H2O]5

This is the iron complex in question: $\ce{Fe2Cl6[H2O]5}$ I'm pretty sure according to the nomenclature it should be: pentaaquahexachloroiron(III) but I wanted to check somewhere to be sure.
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Butanone or butan-2-one?

According to IUPAC rules, am I right in assuming that butanone is sufficient, because there's only one possible molecule? I keep noticing butan-2-one, so I want to make sure.
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Do alkenes have priority over alkynes in R/S naming?

I am studying for an upcoming exam and I came upon a confusing question for the drawing of the molecule (3⁠R)-hex-1-en-5-yn-3-ol. Why is the stereocenter (3-carbon) R? Shouldn't it be S? After ...
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Why is 5-chloro-1-methylcyclopentene not named 3-chloro-2-methylcyclopentene? [duplicate]

Why is the ring numbered the way it is? What is it about the double bond that makes it so? source
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Names of NAD+ and NADH

As part of the biochemical process of glycolysis, NAD+ is reduced to NADH. In other words, nicotinamide adenine dinucleotide is reduced to... nicotinamide adenine dinucleotide? Everywhere I look ...
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2answers
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What is the IUPAC preferred name of this tetracyclic natural product?

On page 819 of Vollhardt, Organic Chemistry 7th Ed., the following "subunit of the antibacterial platensimycin" appears. I have attempted to apply von Baeyer and skeletal replacement ('a') ...
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1answer
533 views

Naming ester as a substituent to carboxylic acid

Can carboxylic acid functional group -COOH and ester's functional group R-COO-R' be in one structure? If yes, carboxylic acid will be the parent chain and ester will be the substituent as c.a. is ...
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1answer
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Origin of the name of barbituric acid

Recently, I have encountered two different accounts explaining the origins of the name "barbituric acid". Both accounts do mention that the name of this compound was given by the famous organic ...
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1answer
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What does the slash in polymer nomenclature, e.g. Acrylates/ Beheneth-25 Methacrylate Copolymer, mean?

I was given a task to find SDS-Sheets for polymers/microplastic particles in cosmetics and I am confused, since there are often two chemicals divided by "/", e.g. Acrylates/ Beheneth-25 Methacrylate ...
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1answer
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IUPAC nomenclature of organic compound

I strongly feel that the answer should be option (1) as the ester functional group has a greater preference over the double bond and hence it should get a lower locant. But the source of the question ...