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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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Numbering starts from the side that has more locants or from the side that has a more preferable group?

I came across this question while practicing iupac nomenclature. Should we number the parent chain from left to right (shown in blue) because there are three cholrine atoms attached to C1 while ...
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CIP Rules - How to deal with a double bonded nitrogen? [on hold]

If a substituent were to exist, how will one deal with the doubly bonded nitrogen? In the tree will the nitrogen with the double bond have (C,C) or (C,C,C) or (C,C,lone pair)? I could not find this ...
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Chemical Formulae and the Periodic Table of Elements

Reading about heavy water, I have found that the chemical formula for it can be written 2H2O or D2O. Deuterium is an isotope of hydrogen that is found in large quantities in water, more than one ...
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Why is ethoxyethane the preferred IUPAC name for diethyl ether rather than 1,1'-oxydiethane?

Diethyl ether has a few systematic names. Its preferred IUPAC name is generated using substitutive nomenclature: ethoxyethane. But multiplicative nomenclature could be used, in the symmetric spirit of ...
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What are the conditions for using skeletal replacement ('a') nomenclature?

The Blue Book 2013 in P-63.2.4.1 gives “1-methoxy-2-(2-methoxyethoxy)ethane” as the IUPAC preferred name for $\ce{CH3OCH2CH2OCH2CH2OCH3}$ and comments, Skeletal replacement (‘a’) nomenclature [...
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Naming Alkenes with double bond branches?

This has confused me for so long, after reading the IUPAC rules over and over, I found the parent chain to be from the the CH2 numbered 1 to the one numbered 9, and I considered both CH3's as branches,...
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Why acyl halides are not named as 1-substituted aldehydes?

For acyl halides, IUPAC uses preferably the "acyl halide" type naming (e.g. acetyl chloride). But they can be theoretically named as aldehydes, where a hydrogen atom in the $\mathrm{CHO}$ group (...
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How are t-butyl substituents named according to IUPAC nomenclature?

What is the IUPAC name of this structure? I've actually came up with two names, the first one is "1-tert-butyl-5-heptyl-2-propylcyclononane" and the other one is "1-(1,1-dimethylethyl)-5-heptyl-2-...
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1answer
51 views

Using Roman Numerals to indicate a compound

I don't completely understand it's use. Here's an example I don't understand: Shortly after discussing $\ce{[CuCl4]^2-}$, an exam paper asked a question about copper(II) chloride. I understand that ...
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When naming an organic molecule - which group has the highest priority: methyl or methylidene?

I have been tasked with naming Myrcene. (see image below) Which of the following names is correct? 7-methyl-3-methylidene-oct-1,6-diene or 3-methylidene-7-methyl-oct-1,6-diene Thank you in ...
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What is the logical way to understand Iso, Sec, Tert and Neo prefixes?

I'm only familiar with Alkanes at a basic level currently. What seems logical to me is that an Alkyl molecule with the: "iso" prefix means its an isomer of that alkyl, the usual way i'd see it would ...
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33 views

Imine as substituent nomenclature

I am trying to name the following compound: I thought the name would be: (E)-3-[(4-methylphenyl)methylideneamino]benzoic acid I stayed away from benzylidene since P-57.1.2 indicates no substitution ...
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1answer
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Naming this organic compound [duplicate]

What’s the name of the following compound? $$\ce{CH3C(p-ClC6H4)2CH(Br)CH3}$$ My teacher said that she strongly thinks( with another teacher) that it should be 3-bromo-2,2-bis-(4-chlorophenyl)butane, ...
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Bibenzimidazole nomenclature: Indicated H and locants

I am trying to understand how the locants work for the following molecule (locants added by me). I added the locants following IUPAC Blue Book rules from 2013, P-14.4. Basically, first numbering ...
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1answer
56 views

What is the nomenclature of this alkane?

In this alkane, the blue line is parent chain. It is 12 carbon based. I wonder why red line cannot be parent chain. It does not compete with blue line about the position of substitution. And also, i ...
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What would the chemical name be for C13H8Cl3NO

Formula C13H8Cl3NO SMILES C1=C(C(=CC(=C1)Cl)Cl)N(C(C2=CC=CC=C2)=O)Cl I found the diagram on the left in a book and drew the one on the right using https://pubchem.ncbi.nlm.nih.gov/...
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1answer
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Nomenclature of an organic compound with benzene and double bonds

How would the following compound be named? Attemp of solution I believe is 4-phenyl-1,2-pentadiene
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Which one has higher priority according to Cahn–Ingold–Prelog rules?

Which one has higher priority according to Cahn–Ingold–Prelog rules? (1) $\ce{-CH2OH}$ and $\ce{-CH=CH2}$ (2) $\ce{-CH2OH}$ and $\ce{-C(CH3)3}$ The answer says $\ce{-CH=CH2}$ has higher ...
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1answer
38 views

How do I use the priority list of substituent groups to decide the parent chain for this compound?

I know that the -OH group has a higher priority than the -Cl group, but does that mean I should favour including it in my parent chain even if there's another chain that has a lower locant on the ...
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1answer
318 views

What would be the name of this compound? [closed]

Although I assume this compound is likely unable to be formed, my chemistry teacher put it up on the whiteboard to show the extent of what you can name using IUPAC nomenclature, out of interest I ...
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2answers
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Confusion in the name of this organic compound

I think the name of the above compound should be 3-Ethyl-2-methylcyclohex-1-ene. However, according to my book (Organic Chemistry Resonance DLPD, page #43, question #5), this organic compound is 6-...
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1answer
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Why 1-ethenyl-3-ethyl-5-ethynylbenzene has that name?

I would priorized these funtional groups based on two options (following the ciclohexane rules): Molecular weight Representing each pi bond as a alkane branch. e.g. Ethenil as a isopropil backbone. ...
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Nomenclature of carbohydrates

In the chapter on Biomolecules in my book, the following points are given regarding carbohydrates. Numbering the C-chain with consecutive rank The C-atom present in the aldehyde group of ...
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Organic Nomenclature [closed]

10.2 It has to add 4-propyl is that correct? And 10.3 why do we choose the position 1,5 instead of 2,3?
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Aminoethyl or ethylamine?

I was trying to name the above compound which happens to be 3-(2-aminoethyl)-2-methylcyclohexan-1-ol. On my first attempt, I had named it 3-(ethyl-2-amine)-2-methylcyclohexan-1-ol. Which one is ...
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1answer
51 views

What is the name of this organic compound?

The organic compound in question is shown above. This is how I tried to name it: Start from the left hanging $\ce{H_3C}$. $\ce{OH}$ gets the number 2 and $\ce{NH_2}$ gets 6. The lowest numbers ...
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1answer
73 views

Bond-line structure of 2-methyl-3-phenyl-1-butanol

According to me the structure of 2-methyl-3-phenyl-1-butanol is the above one. Is my answer correct?
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2answers
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How is 2-hydroxy-ethoxy named?

2-hydroxy-ethoxy is $\ce{HO-CH2-CH2-O}$. I have a couple of confusions regarding this substituent. Ethoxy is $\ce{-HO-CH2CH2}$ or $\ce{-OC2H5}$. So the $\ce{HO}$ in the above formula probably ...
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4answers
871 views

Largest alkane having a given alkane as its base name

What is the largest (most carbon atoms) alkane having heptane as its base name? For example, 2,2,3,3-tetramethylbutane is the largest (most carbon atoms) alkane retaining butane as its base name.
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Phase abbreviations for non-aqueous solutions

When writing a chemical equation, how do you indicate that a chemical is dissolved in a non-aqueous solvent? For example, it would be inappropriate to write X (aq) when X is dissolved in benzene, ...
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313 views

What should be the IUPAC name of the following compound?

I think it should be named as 2-(cyclopent-1,4-diene)-2-methyl ethan-2-ol.
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0answers
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Confusion about prioritizing functional groups in case of poly functional organic compounds

According to Wikipedia, sulfonic acid $(\ce{-SO3H})$ is comparatively stronger than carboxylic acid $(\ce{-COOH})$. Then why is sulfonic acid lower in priority than carboxylic acid (while naming poly ...
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1answer
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Question about Carboxylic Acid Nomenclature

According to my chemistry textbook, 2-hydroxy-1,2,3-propanetricarboxylic acid is represented as: But 5-bromoheptanoic acid is given as: In the former nomenclature, propane is taken as the base ...
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Why do people commonly refer to Na2HPO4 as Sodium Hydrogen Phosphate, rather than Disodium Hydrogen Phosphate?

First of all, I am aware of this question. The purpose of my question is to understand why people seem to break the rules that IUPAC has set (See example five on page 76 of the book), especially ...
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3answers
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What is the name of this chemical LiB2PO4H7? [duplicate]

I was recently looking at a chemical equation calculator that balances equations for you. I came across a reaction that I am unsure about, it goes like this: B2H6 + LiH + PO4 = LiB2PO4H7 I was ...
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1answer
52 views

Why is this named 3-phenyl-2-butanol instead of 2-phenyl-3-butanol? [closed]

Why is the following compound named 3-phenyl-2-butanol and not 2-phenyl-3-butanol? Does the alcohol or the phenyl group have priority?
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1answer
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Does an acetal need to have one hydrogen attached to its carbon?

I was asked to identify the functional groups in this molecule above. So far I have found an amide ($\ce{-NHAc}$), an ether ($\ce{-OBn}$), and a conjugated diene, but I was also told that there is ...
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1answer
58 views

Does the priority go for the longer substituent, the closer one, or one which contains a pi-bond in naming Alkenes and Alkynes?

According to the new IUPAC nomenclature, the longest chain is given the priority over that which contains the most number of double bonds. In naming this alkene: From which end would we start ...
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1answer
77 views

Ketone prefix organic chemistry nomenclature

Is there a difference between the prefixes keto- and oxo-?
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1answer
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Nomenclature priority of prefixes consisting of identical letters but containing different locants [closed]

I have no idea how to name this compound. Can someone please help give the IUPAC name for this? Also mention the IUPAC nomenclature rules followed while naming.
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1answer
56 views

What should be the IUPAC name of this compound?

I feel that either of 4-bromo-3-chlorocyclohex-1-en-5-yne or 3-bromo-4-chlorocyclohex-5-en-1-yne is correct.
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2answers
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The nomenclature behind “Diacetonamine”

Please explain how the name “Diacetonamine” can be found by looking at the formula: $$\ce{(CH3)2C(NH2)CH2C(O)CH3}$$ Why is it called “Diaceto” if there only one $\ce{-C(O)CH3}$ group?
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IUPAC nomenclature of aspartame

I'd like some help in constructing the IUPAC name of aspartame: From what I understand there are carboxylic acid, amine, amide, ester, and phenyl groups - but I'm having trouble figuring out the ...
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Can benzene ring be the part of a acyl group

Can benzene ring attached to c=o i.e carbonyl group be considered as a acyl group?
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Differences in Glycerol Nomenclature [closed]

Could someone differentiate between the terms glycerol, glycerin, glyceryl and glyceride?
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Endo/Exo for same length bridges

I'm looking at a cycloaddition that produces a bicyclic intermediate, there are two different ways of doing the addition which can be described as endo/exo. However, all three bridges are the same ...
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2answers
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I need the diagram of “cyclobutanal” [closed]

I doubted whether I can say cyclobutanal or not. Im confused and didn't found my answer anywhere
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1answer
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How does NH4+ come to being?

There are 5 valence electrons in Nitrogen and in order for it to have a complete outer shell (8 electrons) it needs 3 more electrons. Why is it the case that the Nitrogen needs 4 Hydrogen instead of 3 ...
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2answers
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Why is petrol also called octane? [closed]

Why do people commonly use octane as a synonym for petrol (gasoline)? Isn't petrol a mixture of hydrocarbon distillates--not a pure substance?
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Formulation and Nomenclature of Boric and Phosphoric Acids

Why are boric and phosphoric acids are formulated as: H3BO3 H3PO4 Instead of: HBO2 HPO3 Because the acids end with the -ic suffix, the valences of the elements between the hydrogens and oxygens ...