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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In IUPAC naming, is the name of the compound “(4S)-pentane-1,1,4-triol” or just “pentane-1,1,4-triol”? [closed]

I was trying to name $\ce{CH(OH)2-CH2-CH2-CH(OH)-CH3}$ according to IUPAC rules. However, when I search it up online, PubChem says there should be $(4S)$. Is that supposed to be there, and what does ...
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Shouldn't this compound be called 2-methyl-5-(1,2-dimethylpropyl)nonane?

The book says that the name should have dimethylpropyl methyl nonane in that order. Shouldn't the methyl group come first since methyl comes before methylpropyl (in the alphabetic order)? Our prof ...
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57 views

ᴅ-amphetamine, ʟ-amphetamine

The following structural formula (source: Wikimedia) is labelled ᴅ-amphetamine: A Fischer projection of this molecule would contain, I think, the following line: $$\ce{H2N-C-H},$$ and I would have ...
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324 views

R/S configuration of bridging carbon in bicyclic system

I am trying to figure out the R and S configuration of bridging carbons in bicyclic systems. In the image, there are two bicyclic systems and depending on the position of the Br substituent, the R or ...
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would this be organic compound be called “3,4-diethyl-3,7,7-trimethylnonane” with IUPAC naming rules?

I dont really know if this should be called 3,4-diethyl-3,7,7-trimethylnonane or something else?? Like it could also be 6,7-diethyl-3,3,7-trimethyl something?? I am trying to do this by IUPAC rules
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How were urolithins discovered and named?

Urolithin is a product of the degradation of ellagic acid by gut flora and has significant biological activity. (Wikipedia) I am curious as to how it was discovered but cannot find the story. Although ...
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2answers
58 views

Cis-trans isomerism with electron pairs [closed]

Is it possible to name compounds with lone pairs on the double bonded species using the cis-trans nomenclature? For instance, can't you name $\ce{Ph-N=N-Ph}$ by the relative position of the nitrogen ...
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What do the prefixes in the gamma and beta SO3 mean? [duplicate]

I have been reading through a lot of inorganic chemistry texts pertaining to compounds of sulphur, particularly $\ce{SO3}$. I came across terms like gamma and beta $\ce{SO3}$, which were in essence ...
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Conversion of molecular structure into Fischer projection for compounds having more than two chiral carbons

Question What is the Fischer projection of the given compound's enantiomer? Answer My attempt I tried to solve this by first converting it into the Fischer projection of the given compound and then ...
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Absolute Configuration in Stereochemistry [closed]

I got all the rules of writing RS nomenclature for Perspective formula of chirality center only problem being, I m confused that given compound can have any configuration depending on how I write the ...
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Nomenclature of halogenoalkanes

Why is the following compound called "1,1,1-trifluoro-2-chloro-2-bromoethane"? Why is this not called "1-bromo-1-chloro-2,2,2,trifluoroethane" alphabetically? (the name, 1,1,1-...
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Name for H2O- radical? (H2O+ radical is Oxoniumyl)

Radical are atoms with unpaired electrons, and they have short lifetimes because the unpaired electrons are highly chemically reactive. The $\ce{H2O^{.+}}$ radical is named oxoniumyl. Is there a name ...
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Is the IUPAC name for this compound, 1,5,6-cyclohex-1-ene or 2,3,4-cyclohex-1-ene? [closed]

Is the IUPAC name for this compound, 1,5,6-cyclohex-1-ene or 2,3,4-cyclohex-1-ene?
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How to write the formula of a mixed metal salt?

I suppose the formula of the Sulphate salt of Sodium & Potassium is $\ce{KNaSO4}$ as the Pubchem site says so. So, is there any rule that in the formulae such mixed metal salts we need to write ...
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200 views

TKN: Why are they called Missouri tablets?

When analyzing for Total Kjeldahl Nitrogen (TKN), you can make a copper sulfate digestion solution in the lab or purchase a variety of pre-prepared digesting tablets for example on VWR. My question is,...
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Understanding formulas for PZT

In the slides i'm studying (about the production of PZT), is given the following formula for lead zirconate titanate : $$\ce{PbZr(Ti)O_3}$$ with the explanation: It is a solid solution of two oxides: ...
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60 views

Why is H5PO5 not called as phosphoric acid? [closed]

Recently, my course of inorganic chemistry has begun, and in the nomenclature of inorganic acids, our professor told that phosphoric acid is $\ce{H3PO4}$ and phosphorous acid (orthophosphorous acid) ...
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1answer
68 views

What is the name of this compound? [closed]

This doesn't look like an amide. What is its IUPAC name? Is this compound even possible?
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Naming a synthetic molecule from QM9 dataset [closed]

I was trying to write a name for a synthetic molecule in QM9 dataset. The molecule is: is 3-aminooxolane-2-carbonitrile a correct name for this?
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1answer
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Why Peroxydisulphuric Acid is also called as Marshall's Acid and Peroxymonosulphuric Acid as Caro's Acid? [closed]

I recently come across the oxaacids of Sulphur and got to know to Acids, $\ce{H2S2O8}$ and $\ce{H2SO5}$ as Marshall's Acid and Caro's Acid respectively, but I am just eager to know why they are named ...
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Why is this compound named (Z)-but-2-ene-1,1-diyldibenzene and not (Z)-1,1-diphenylbut-2-ene

A recent answer of mine involved the synthesis of the following compound: I initially assumed the name of this compound to be (Z)-1,1-diphenylbut-2-ene as the butene is the main chain, with two ...
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When we name an organic compound ,if there is double bond and a functional group which is now a substituent who has priority? [closed]

For example if a particular compound contains carboxylic acid, alcohol and double bond and the compound is such that we can either include double bond or alcohol in the main chain then who has ...
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E-Z system without a double bond

Can we apply E-Z nomenclature to geometrical isomers without a double bond. For example, can we use it for cis and trans isomers of 1,2-dimethylcyclohexane?
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264 views

What do 'sigma' and 'pi' in front of ligands in the formula of a coordination compound mean?

The following coordination compound was given in the book Concise Inorganic Chemistry by J.D. Lee (Adapted by Sudarsan Guha) under the topic 'Effective Atomic Number (EAN)': $\ce{[Ti(\sigma -C5H5)2 (\...
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484 views

Naming of [Pt(py)4][PtCl4]

Why is $\ce{[Pt(py)4][PtCl4]}$ called tetrakis(pyridine)platinum(II) tetrachloridoplatinate(II) and not tetrapyridineplatinum(II) tetrachloridoplatinate(II)? I thought you use tetrakis for ligands ...
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112 views

IUPAC nomenclature of protonated aminoacids

What is the IUPAC systematic name for the above compound. So I know that carboxylic acids have highest priority. Now the length of carbon chain is 7. So I think the name should be 7-ammonioheptanoic ...
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1answer
61 views

What is the naming convention for Sn and Pb in inter-metallic compounds?

How would one go about naming inter-metallic (specifically, transition post-transition) compounds containing tin and lead? It is usually easy figuring out the naming of such compounds as they follow ...
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Prostaglandin Nomenclature

Prostaglandins are lipid substances derived from fatty acids, which act as powerful biochemical regulators. In Wade's Organic Chemistry, they indicate that there are several families of ...
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Naming terminal monosubstituted alkenes conformations [duplicate]

Alkenes can be described by E/Z nomenclature and cis/trans nomenclature. However, is there a way to name alkene conformations which are monosubstituted? For example, how could one describe the ...
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1answer
289 views

Can you call H_2 an Atom? [closed]

I am currently studying to complete the Chemistry CLEP exam, I ran into this question and was thoroughly confused by the phrase 12.04x10^23 atoms of H_2 According to the question, this corresponds ...
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Where to put the number in organic nomenclature? [closed]

Should one write 4-hydroxypentan-2-one or 4-hydroxy-2-pentanone? It has been seen that both have been used frequently.
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What should be the name of this compound containg both double and triple bond?

Which is a more correct name, according to IUPAC nomenclature: pent-2-ene-4-yne, or pent-3-ene-1-yne?
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Naming substituted bicyclo compounds

I have to name the above compound. I am getting 5-bromo-2-chloro-7-fluorobicyclo[2.2.2]octane. But my teacher is telling me that the answer should be 2-bromo-5-chloro-8-fluorobicyclo[2.2.2]octane. His ...
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The IUPAC name of a multifunctional carboxylic acid compound

What is more preferred name when ester is present as junior functional group bis-carboxylic acid? (refer the image attached): to count carbon of ester and consider two branches on it (one oxo and ...
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1answer
55 views

In Parent chain choosing should one consider longest chain or chain with more substituents? [closed]

Should one take the longest chain or the one containing the prefix/suffix with most priority.Moreover if a shorter chain has two units of the main prefix will it be taken as parent? examples: ...
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86 views

IUPAC nomenclature for tricarboxylic acids

What is the rule for naming compounds with three carboxyl groups? I have the two following coumpunds 4-(Carboxymethyl)heptanedioic acid Pentane-1,3,5-tricarboxylic acid They both have 7 carbon ...
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1answer
29 views

Preferred IUPAC name of Protoporphyrin IX

I was looking up protoporphyrin IX and was surprised to find that no two websites gave the same IUPAC name for the compound. Here are some examples: 3,3'-(7,12-Diethenyl-3,8,13,17-...
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Precise definition of cylindrically symmetry in MO theory?

I was watching an MIT OpenCourseWare lecture on MO theory which mentioned that $\sigma$ orbitals are "cylindrically symmetrical." I was a bit confused, because I was under the assumption that the ...
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2answers
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Something is wrong with converting structure to name in ChemDraw 18.0 [duplicate]

I am using the tool "convert structure to name" to name 2 organic compounds below. But, it seems the names are not wright. Can someone explain to me whether I am wrong or the software made a mistake?
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What is nowadays called silazane?

Example from the Recommendations 2013. Left: Alleged disilazane ; Right: My version Clearer example without obvious flaws in alternative structure. Left: Alleged disilazane ; Right: My version I am ...
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Disubstituted cyclic alcohols - looking for IUPAC rule

Given a simple cyclic alcohol: We can name it cyclopentanol and using cyclopentan-1-ol wouldn't be correct. When more than one ...
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5-(prop-1-yn-1-yl)nonane or 4-butyloct-2-yne?

I have a problem in naming this hydrocarbon. I don't know wheteher it should be 4-butyloct-2-yne or 5-(prop-1-yn-1-yl)nonane. Any help appreciated.
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Need an app that gives the name of organic compounds “step by step” [closed]

I need an app that gives the IUPAC names for any organic compound, and also gives the reasons of this nomenclature, step by step. Any help appreciated.
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Naming acids, oxidation numbers and charges

I have been studying chemistry for a short time and studied the nomenclature of inorganic compounds. I got to naming acids, and got really confused with several things, including the definition of ...
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2answers
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What is the IUPAC name of [Cr(H2O)5Cl]Cl2.H2O [closed]

What is the IUPAC name of $\ce{[Cr(H2O)5Cl]Cl2.H2O}$? The net says that the correct name is Pentaaquachloridochromium(III) chloride. But do we not have to account for the water molecule present ...
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818 views

Why is iso-octane different from other iso-s?

While learning nomenclature of organic compounds I found the common names to be a bit difficult to learn than the IUPAC ones. One of these common name stuff is the iso-,neo-, sec-, etc. So I searched ...
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82 views

How to name the following compound?

I know that when both carboxylic acid and ester group are present then the carboxylic acid takes priority and ester is treated as side chain . It is denoted by prefix alkoxy carbonyl. But the ...
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1answer
697 views

Dimethylethylamine or Ethyldimethylamine?

I thought that Organic Naming was based on alphabetical for alkyl branches, so I thought it was ethyldimethylamine, however google results show me Dimethylethylamine. So which one is right? And is ...
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49 views

IUPAC name of Dewar benzene [closed]

Dewar benzene according to Wikipedia has the IUPAC name bicyclo[2.2.0]hexa-2,5-diene. Is it correct to give this name because resonance takes place and if we fix a certain numbering, as resonance ...
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59 views

What is the meaning of parentheses in “NAD(P)H”?

If someone writes "NAD(P)H is oxidized by ...", does that mean they are referring to both NADH and NADPH? If so doesn't that lead to confusion when thinking quantitatively since the reactions may ...

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