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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Which would be the undefined article in singular for Ag0/AgCl reference electrodes?

The Google exact match searches for "an Ag0/AgCl reference electrode" and "a Ag0/AgCl reference electrode" yields the same few results. Which usage would be more appropriate, for ...
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Why is Formanilide not named N-benzamide in IUPAC Nomenclature

The preferred IUPAC name for formanilide is N-phenylformamide. However, it is very similar to benzamide, except for the atom to which phenyl is attached How does the bonding arrangement, in this ...
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Source to practice organic chemistry nomenclature [duplicate]

Is there a website or a big PDF to practice just nomenclature of organic compounds. thanks.
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Nomenclature of tertiary amine derivative

I’m experiencing difficulties putting together a full name of the tertiary amine. One substituent is propyltrimethoxysilane $\ce{(OEt)3Si-CH2-CH2-CH2\bond{-}}$, and the two others are ...
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What does $n$ represents in "hydrated compound⋅nH2O"? [closed]

On wiki it is written that in "hydrated compound⋅nH2O" $n$ is the number of water molecules per formula unit of the salt. I don't understand what that means and this is indicated in that I ...
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Numbering order in IUPAC name of a trisubstituted alkatriene

During E/Z-nomenclature class, I found this molecule. Using MarvinSketch 21.15.0 version I have (3E,5E)-6-bromo-3,4-dimethylhexa-1,3,5-triene for it. Why the name couldn't be (1E,3E)-1-bromo-3,4-...
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Systematic IUPAC name of buckminsterfullerane

Many of you have heard of buckminsterfullerEne, which is C60, also called the "buckyball". Well, there's also buckminsterfullerAne, which is C60H60. This is a buckyball that's fully ...
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Systematic and preferred names of acetamide

My book says to use carboxamide when it is a carboxylic acid derivative (acyl). Ethanamide $\ce{CH3CONH2}$ is a carboxylic acid derivative, so shouldn’t it be named ethan-1-carboxamide rather than ...
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-1 votes
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How do you find oxidation state of the metals of a complex with two coordination spheres?

For example suppose we have $\ce{[Pt(NH3)4][PtCl4]}.$ For the naming of this complex I need to know the oxidation number of the metals; let the oxidation number of first and second $\ce{Pt}$ be $x, y$...
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How do I understand the IUPAC naming of 9-methyl-3-[(2-methylimidazol-1-yl)methyl]-2,3-dihydro-1H-carbazol-4-one? [closed]

I'm having trouble understanding the IUPAC naming convention of 9-methyl-3-[(2-methylimidazol-1-yl)methyl]-2,3-dihydro-1H-carbazol-4-one. It would be great if you can help to breakdown the naming ...
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Why is methane not called carbon tetrahydride?

If aluminium hydride, $\ce{AlH3}$, is called "hydride" because it contains elemental hydrogen and sodium chloride, $\ce{NaCl}$, is called "chloride", and calcium carbide $\ce{CaC2}$...
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Difference between DSF (disulfiram) and DSF-Cu

I though tetrathiomolybdate (TM) and disulfiram (DSF) were forms of copper chelators, so I don’t understand the difference between TM/TM-Cu and DSF/DSF-Cu in the below graph. Are they chemically ...
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Definition of amino acid side chain

Is the α-carbon considered a part of amino acid side chain? Is the nitrogen atom on the backbone is considered a part of the side chain of the proline?
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Chloro functional group is given number 4 in phenol but number 1 in nitrobenzene

In the IUPAC name 4-chlorophenol, we see that, the C atom where OH group is attached, is given number 1. But in the IUPAC name 1-chloro-4-nitrobenzene, we see that, the C atom where $NO_2$ group is ...
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E and Z nomeclature when we have a ring instead of double bond

I am confused as to whether the E/Z nomenclature can be extended to compounds of general structure like in the image. Clearly they are some sort of cis and trans but I cannot see a non-aromatic double ...
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Alkylbenzenes or Phenylalkanes (Nomenclature)

I've seen this rule cited in several websites: If the substituent contains no more than six carbon atoms, the compound's parent name is benzene Could someone update me with the latest rule in naming ...
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nomenclature of propane-1,2,3-tricarboxylic acid [duplicate]

The iupac name of this compound is given book as "Propane-1,2,3-tricarboxylic acid" My doubt is, why the carbon of the first carboxylic acid is not included in the main parent chain while ...
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5 votes
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Should the principal carbon chain contain maximum number of functional groups or just the principal functional group?

My answer was the 6 carbon chain, i.e. the name would be 2-(2-hydroxyethyl)-4-methylhexanoic acid. But the given answer is the 4 carbon chain, i.e. the name would be 4-hydroxy-2-(2-methylbutyl)...
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Does the same name represents all resonance and hybrid structure of a molecule?

The name chlorobenzene represents the following molecule. But the molecule shows resonance and its resonating structures are So does the same name represents all the resonance structures? Does it ...
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Why 1-methylethanol is not preferred IUPAC name for isopropyl alcohol?

For the compound $\ce{CH3-CH(OH)-CH3}$ I propose two names: propan-2-ol and 1-methylethanol. Which is the correct name as per the IUPAC guidelines? According to Organic Chemistry by Morrison and Boyd, ...
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IUPAC Nomenclature Confusion [duplicate]

Compound In the given compound I am confused between two possible names : 1,3-dichloro-2-(chloromethyl) Propane 2-(chloromethyl)-1,3-dichloro Propane Fundamentally, I have the following two doubts : ...
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3 votes
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Does it matter, and if so, how should "dAMP" (meaning "deoxyadenosine monophosphate") be pronounced?

When an expert says "dAMP" (meaning "deoxyadenosine monophosphate") is it pronounced "dee ay em pee", "lowercase dee ay em pee", "damp", "dee amp&...
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4 votes
2 answers
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Why is deoxyadenosine monophosphate called "dAMP" and not "DAMP"?

Why is deoxyadenosine monophosphate called "dAMP" and not "DAMP"? After all, deoxyribonucleic acid is called "DNA", and not "dNA" (nor "dRNA", thanks ...
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1 vote
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Degree of polymerization with structure-based polymer naming

Polymers may be named using either a structure-based or a source-based nomenclature, as detailed in the IUPAC Purple Book.[1] Therefore, the polymer descibed by $\require{enclose}\ce{\enclose{...
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4 votes
3 answers
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IUPAC nomenclature of extremely long alkanes

What would be the name of a linear alkane containing 10000 carbon atoms, i.e. $\ce{C10000H20002}$? I have searched for it, but the longest alkane I could find had 9000 carbon atoms (and was apparently ...
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8 votes
1 answer
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Are there separate quantity symbols for the pKa of a substance and the pKa of its conjugate acid?

For polyprotic acids, we distinguish the different deprotonation equilibria and their equilibrium constants by indices, e.g. phosphoric acid dissociation is described by $K_1$, $K_2$, and $K_3$. ...
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4 votes
1 answer
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Naming of an organic compound containing nitrogen and fluoride

I'm don't have a background in chemistry but I've been doing a project on computer aided molecular design and one of the resulting molecules was: I'm having trouble naming this molecule let alone ...
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IUPAC name of benzoyl chloride

I came up with two possible names: benzoyl chloride and benzene carbonyl chloride. I believe both names are correct. Wikipedia says that the preferred IUPAC name is benzoyl chloride: Can someone ...
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Multibranched fluorinated thiol IUPAC name

I've been reading some papers about using self-assembled monolayers as hydrophobic coatings and came across this molecule: Throughout the entire article its simply referred to as "multibranched ...
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Why is 1,3-dimethyl-cyclohexane a meso compound?

So i was trying to find the plane of symmetry in 1,3-dimethyl-cyclohexane in chair conformation, but then i realised the plane is present only at a particular orientation [see figure]. So why do we ...
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4 votes
1 answer
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IUPAC naming of purines and pyrimidines

From Wikipedia, the IUPAC name for guanine is 2-amino-1,9-dihydro-6H-purin-6-one besides 2-amino-6-hydroxypurine and 2-aminohypoxanthine. I have some difficulty understanding the 6H part in its name ...
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How to name radical

The name of biradical —CO—CH2–O—CH2–CO— is Oxybis (1-oxo-2,1-ethanediyl). Why is it wrong to write 1,2-ethanediyl instead of 2,1? Thanks in advance!
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1 answer
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Numbering of carbon chain in 3-bromo-2-methylpropene

I have a specific confusion in numbering the carbon chain for 3-bromo-2-methylpropene. I found two carbon chains of equivalent length (three atoms) and equivalent side chains (one atom). For both ...
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1 answer
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(IUPAC) How do you number an alkane that has two equally small starting points?

For example, do you number this from left to right or right to left? How do you know? Would you get 2,4-dibromo-6,6-dichloro-5-methylheptane or 4,6-dibromo-2,2-dichloro-3-methylheptane?
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Kappa convention in additive nomenclature

I’ve recently enrolled in university and in my inorganic chemistry we were covering nomenclature as recommended by IUPAC of course. We never covered any examples where 2 different polyatomic groups ...
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1 answer
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What is "tail" in case of secondary structure of protein? [closed]

What is a "tail" in the case of the secondary structure of a protein? How does it influence the "protein assignment" task?
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4 votes
1 answer
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Why use "molecular equation" to refer to a chemical equation describing a precipitation reaction?

When we describe a precipitation reaction using a chemical equation, we have the choice of either writing the net ionic equation (i.e. leaving out spectator ions) or writing the respective ionic ...
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1 vote
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IUPAC name for compound with various carbonyl groups

I found this question on a resource video for IUPAC Nomenclature for a competitive exam. It would be great if someone provided the approved IUPAC approved name for this compound. Source of the ...
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1 answer
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Multiplicity prefixes for complex compounds with organic ligand

Consider the compound $[\ce{Ni(gly)_2}]$, with $\ce{gly}$ denoting glycinate ligand. Should the name be bis-(glycinato)nickel(II) or diglycinatonickel(II) In my book, it's written that the prefixes &...
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suffix in IUPAC nomenclature [duplicate]

The name of the following of compound is given as propane-1,2,3-triol. HO-CH2-CH(OH)-CH2-OH The structure and nomenclature is very simple for this compound (C3H8O3) but my doubt is why propane does ...
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5 votes
1 answer
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Symbol to denote a group which is either an oxygen atom or NH group

I'm drawing the generic structure of several different organic molecules in my thesis. They share some features, one of which is a carbonyl carbon attached to either an oxygen atom (i.e. ester) or an $...
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What does the prefix tetrahydro mean?

I'm wondering what is the meaning of tetrahydro when used as a prefix. For example, THC (tetrahydrocannabinol) and also THF folic acid (tetrahydro folate) or THF (tetrahydrofuran). I couldn't ...
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Identify E/Z Configuration

[(2E)-4-ethylhept-2-en-3-yl]cyclopropane why it is named E Where according to cahn ingold prelog rules At left side Methyl is prior and on the right side the butane should be prior than cyclopropane
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-3 votes
1 answer
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Doubts regarding Mole concept and Avogadros number [closed]

So I am really confused about simple topics like mole and Avogadro Here is my oversimplified view So mass of 1 atom of elements in grams was not in whole numbers and it was difficult using em for ...
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4 votes
1 answer
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On what basis are the prefixes α and β given to black phosphorus?

My textbook says the following about black phosphorus: α black phosphorus is formed when red phosphorus is heated in a sealed tube at $\pu{803 K}$. β black phosphorous is prepared by heating white ...
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1 answer
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Do we prefer the main functional group or the longest chain when identifying the main carbon chain IUPAC nomenclature? [duplicate]

Sorry if this question was answered before, but I could not find a satisfactory answer from related questions. Anyways, I have trouble identifying the main carbon chain in above structure. As you can ...
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0 votes
1 answer
404 views

Priority among Halogens in Organic Nomenclature

I have been trying to learn IUPAC nomenclature during the past few days. I have been using the MarvinSketch software to play around with random structures and its generated names and comparing them to ...
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Confusion in D/L nomenclature [duplicate]

With regard to carbohydrates, it is known that in a Fischer projection, if the $-OH$ group is on the right side of the lowest priority asymmetrical (chiral) carbon, then we name it as D and if it is ...
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Nomenclature of Colors of precipitates and solutions

I have just started learning salt analysis in inorganic chemistry. In it i came across the names of colors of various precipitates and solutions. Why do they have prefixes such as "scarlet" ...
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11 votes
2 answers
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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-[...
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