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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(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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32 views

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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102 views

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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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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30 views

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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70 views

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 actually means?

After encountering a few compounds which their name includes the prefix "TETRA HYDRO" I'm wondering what that prefix actually means? For example THC (tetrahydrocannabinol) and also THF folic ...
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78 views

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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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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146 views

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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45 views

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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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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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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58 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 ...
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67 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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242 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 ...
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1answer
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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-...
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222 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-...
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484 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 ...
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491 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 ...
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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 ...
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120 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 ...
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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-(...
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1answer
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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 ...
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3answers
389 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 ...
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1answer
376 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".
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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 ...
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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 ...
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155 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 ...
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1answer
125 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 ...
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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 ...
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411 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 ...
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1answer
232 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 ...
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1answer
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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 ...
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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-...
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191 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 ...
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1answer
285 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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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, ...
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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 ...
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1answer
167 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) ...
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2answers
167 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 ...
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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. ...
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152 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 ...
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1answer
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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 ...
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1answer
389 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’...
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72 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 ...

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