The naming of molecules and elements, usually according to IUPAC standards, but also the accepted uses of traditional ones.

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Why is the gram no longer a function of the atomic mass number?

According to Wikipedia, ... the definition of the gram is not (as of 2011) mathematically tied to that of the atomic mass unit Why did we change that?
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3answers
174 views

How to determine priorities for this compound according to the Cahn-Ingold-Prelog rules?

I stumbled-upon this compound: CC=C1C(C)CCC1(C) and I'm wondering how to determine the configuration of the double bond. Is it E or Z? How do I decide on the ...
4
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1answer
27 views

Nomenclature of complexes: Cyano vs Cyanido ; Chloro vs Chlorido

What is the correct nomenclature for $\ce{CN^-}$ and $\ce{Cl^-}$ ligands in coordination compounds? Wikipedia says the coding name(?) as cyanido and chlorido while this suggests cyano and chloro. ...
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1answer
56 views

Nomenclature of an organic compound

Which substituent should be placed first (in case of alphabetisation)? isopropyl- methyl- I have come across two compounds: 1-methyl-3-methoxy-4-isopropylbenzene and ...
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1answer
55 views

Did Berzelius unify the names of chemical elements using the Latin language?

I asked this question because the Chinese Wikipedia community is trying to decide whether it should use Latin names or IUPAC names for the first introductory sentence for its articles on chemical ...
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1answer
62 views

Method of deriving some properties or possible method of synthesis of a specific monomer

This is kind of like two questions but since they're related I have put them together. Consider a monomer under a hopefully anatomically correct name 'Phenyl Carbolithia Divinylene Oxide ...
8
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1answer
119 views

Nitrogen chain nomenclature

I know that nitrogen is versatile enough that it can form branched chains if it is all single bonds. For example: $\ce{H2N-N(NH2)-NH2}$ Is this compound a nitrane (nitrogen alkane)? If so how ...
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1answer
116 views

Bond-Line Structure for an Alkane

My textbook tells me the following structure is 2,2,5-trimethylpentane. I try to change the parent group in different ways so as to maximize the number of substituent groups, but I think the maximum ...
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19 views

Nomenclature of an Alkane

Is the correct name for the following structure 3-tert-butylhexane or 3-ethyl-2,2-dimethylhexane? I think it is 3-tert-butylhexane, but the textbook says it is 3-ethyl-2,2-dimethylhexane. Can someone ...
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41 views

Difference between a dimethyl and ethyl substituent groups

I'm teaching myself organic chemistry and am struggling with differentiating between dimethyl and ethyl substituent groups. Example: tert-butyl (1,1-dimethylethyl) This chapter follows the one on ...
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1answer
33 views

Nomenclature of organic compounds containing complex side chains

How do we decide the sequence of substituents in a organic compound if one of the substituents is complex. Should the complex chain must always be written first while writing the IUPAC name or are ...
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2answers
67 views

Nomenclature Precedence Order for Unsaturation and Hydrocarbon Chain

When naming branched alkenes/alkynes, the numbers of the carbons where the branches and multiple bonds are located are supposed to be the lowest possible. Do the branches take precedence over the ...
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35 views

Why was the prefix 'bi' used in compounds, such as for bicarb of soda?

According to the Wikipedia article IUPAC nomenclature of inorganic chemistry, he prefix bi- is a deprecated way of indicating the presence of a single hydrogen ion A very common example is the ...
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1answer
49 views

Naming ionic compounds with multiple cations and anions

I have seen complex ionic compounds that have mixed anions and/or mixed cations. For Example I have seen this: $$\ce{NaKCl2}$$ Also known as Sodium Potassium Chloride. The only information I can ...
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1answer
40 views

Stereochemistry: R and S notation

How do we number the carbon atoms in symmetrical molecules while giving R and S notation. For instance, in 2,3-Dibromobutane, there is an ambiguity over which is carbon C2 and carbon C3. Will we call ...
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1answer
14 views

If there are two longest chains possible in an organic compound and both have the same number of substituents, how do we decide the parent chain? [duplicate]

Is the parent chain in the above case determined by atomic mass, alphabetical preference or any other rule?
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1answer
30 views

Name for analog of salt hydrate with non-water solvents?

Salts can bind with some water to form hydrates. For example, we can call $\ce{CoCl_2\cdot 6H_2O}$ cobalt chloride hexahydrate. There is no reason that water should be the only solvent that can bind ...
5
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1answer
69 views

Which has higher priority according to Cahn-Ingold-Prelog priority rules?

Does vinyl or secondary butyl have higher priority, and why? According to my textbook, vinyl has higher priority than isopropyl, because an atom which is connected by a double bond can be treated as ...
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1answer
25 views

Specific and general acid catalysis

What is the rationalization for calling reactions with rates independent of pH but dependent on the concentration of a particular acid catalyst under "general" acid catalysis, and pH dependent ...
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2answers
60 views

Carbon with two double bonds and oxygen name

I have a compound like this: $$\ce{CH2=C=O}$$ I wonder if it is a functional group or a normal group. As a functional group I couldn't find out. Is it a normal compound or a functional group and ...
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1answer
49 views

What is the the full name of TAPD? Structure provided

I have a substituent called TAPD on a molecule I'm working with. I have a hard time locating information about its properties. The bold square in the picture below is supposed to be the rest of the ...
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1answer
32 views

Are these organo-metallic compounds?

My understanding says organo-metallic = organic + metallic compunds. One already known to me is Grignard Reagent ($\ce{RMgX}$). But would you consider $\ce{NaOMe}$ or $\ce{NaCCH}$ as an ...
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1answer
49 views

Why does an acid salt possess acidity as well as basicity?

For example, $\ce{BaHPO_{4}}$ has acidity of 2 and basicity 1. Why does this so? Its basicity is 1 because it has 1 replaceable hydrogen ion. But why does this have acidity?
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140 views

Why do we insert a numerical multiplier after group positions when naming an isomer?

For example, take 2,3 dimethylbutane for example. Why do we add the numerical multiplier 'di' when we've explicitly mentioned two locations? Why not just use 2,3 methylbutane? It seems highly ...
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51 views

Phenyl or benzene when naming compounds

In this picture, the last two molecules are both rings. However, the second last molecule has a halogen substituent and was named "bromobenzene". The last molecule had a chlorine and a hydroxyl ...
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2answers
68 views

How do you name an alkene using IUPAC rules if the longest carbon chain in this alkene does not include the double bond?

For example, which is the right way to name this certain compound: 2-bromo-4-methylene-hexane or 4-bromo-2-ethylpent-1-ene? Does the larger number of carbon in a chain take priority, like in the ...
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147 views

Why do some chemical symbols contain a single letter while others contain two letters in the periodic table?

I am not kidding, this is one of the questions in my chemistry worksheet. Any help appreciated!
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31 views

Meaning of prefix p,p′-?

I recently stumbled across the substance "p,p′-terphenyldicarboxylic acid" in a scientific journal when recently reading about metal–organic frameworks. Could someone explain the prefix p,p'- to me?
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54 views

Organic Chemistry geometrical isometry

What are the configurations of these two compounds? Are they E or Z? Are they Cis or Trans? What are the rules for these types of isomerism? Thanks
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1answer
134 views

Why is it -en-yne and not yn-ene? What is the explanation for this IUPAC specification? [duplicate]

In class today, we were presented with the following molecule: which we determined to be "hept-1-en-6-yne." The order of classification places alkenes above alkynes, so we get the appropriate ...
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38 views

What decides the order of priority of functional groups in organic compounds?

Is the order of defined by IUPAC or we follow some special conventions to know the order of priority?
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113 views

What is has a higher priority in naming organic compounds, alkyl groups or halides?

2-Chloro-3,3-dimethylbutane or 3-Chloro-2,2-dimethylbutane? According to these sources both are correct: NIST/TRC Web Thermo Tables (WTT) ChemSpider
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58 views

IUPAC nomenclature Cyclic vs Acyclic

In this compound both the cyclic and acyclic have 3 carbons , hence a tie. Even the substituent comes on the 2nd position in both cases . So should the main chain be the cyclic one ? (since for ...
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What is the IUPAC nomenclature for Intermetallic Compounds?

So IUPAC has a system for naming organic compounds, ionic compounds, and inorganic compounds. I have seen something vaguely suggesting there is one for intermetallic compounds, such as: $$\ce{Fe-Co}$$ ...
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1answer
45 views

How do I decide the parent chain of an organic compound that has a ring as well as a side chain while naming the compound?

I think that this is decided by the number of carbon atoms. The part which has greater the number of carbon atoms, is considered the parent chain. But this fact is not leading to the correct result ...
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3answers
62 views

Is the following statement about IUPAC nomenclature of substituted benzene accurate?

'While naming any compound, the numbering should be done such that position of substituted groups gives smallest sum.' I'm struggling with IUPAC naming for cyclic compounds. How exactly does one go ...
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0answers
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IUPAC Nomenclature of Benzene+Aliphatic chain [duplicate]

What is this compound's IUPAC name? 1) 2-phenyloctane. 2) octan-2-ylbenzene. Is using phenyl correct or is taking benzene as the base correct?
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72 views

What is the priority of a phenyl group in a compound such as this?

I assumed this: http://www.chemspider.com/Chemical-Structure.12491.html?rid=222625d4-811c-4b07-b263-8930fafa831a to be 1-phenylbut-4-ene Where is the priority here? No source I know of tells me of ...
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2answers
83 views

Nomenclature of methyl groups in an alkanol

Hi, I'm having trouble with this question since I'm getting (A), when the answer says its (B). My logic was that there is a methyl group on the first carbon, and a hydroxide functional group on the ...
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1answer
149 views

Why doesn't the double bond get preference for suffix in IUPAC naming of an Hydrocarbon when both double bond and triple bond are present together?

In the following hydrocarbon both double and triple bond are both present and the naming happens to be hexa-1,3 diene, 5-yne but as far as I have read the rule says the suffix should be given in the ...
3
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1answer
181 views

What is the meaning of brackets in a condensed molecular formula?

In the formula $\ce{(CH3)3-C-CH(CH3)-CH2-CH3}$, what do the bracketed portions represent? What is the molecular structure, and how do I name the compound?
2
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1answer
78 views

The meaning of different parts in the naming of glucose

There are two main types of glucose, $\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose. Can anyone please explain what is $\alpha$,D or (+)? So (maybe by permutation and combination), how many types ...
2
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1answer
37 views

Maltose Nomenclature

Maltose has a 1,4 glycosidic linkage between 2 molecules of α-D-Glucopyranose . My textbook suggests the final name of maltose as 4-O-(α-D-Glucopyranosyl)-D-glucopyranose I wanted to know what ...
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216 views

Do molecules with axial chirality have “stereogenic units”?

This question is a follow-up to a recent question on discodermolide stereochemistry that I answered here. In the course of reading IUPAC's definition of "stereogenic center", I wondered if axially ...
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2answers
168 views

How can I draw 2,3 diethyl heptane

This question was given by my teacher in class : Draw the structure of 2,3 diethyl heptane. So I drew the following: ...
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1answer
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Nomenclature of inorganic compounds

As depicted in books, $\ce{NO3-}$ and $\ce{NO2-}$ are called as nitrate and nitrite respectively. Where (-ate) suffix is used for higher oxidation state and (-ite) suffix is used for lower oxidation ...
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1answer
146 views

What does the prefix “dihydro” in the systematic name of luminol refer to?

I'm doing a research project on the fascinating chemiluminescent molecule luminol, and figured it would be a good idea to start breaking down the systematic name of the chemical and linking the terms ...
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1answer
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What does it mean if a functional group has “higher priority” in terms of IUPAC naming of organic compounds?

What does "higher priority" mean exactly in the following statement from this wikipedia article (article name: "E-Z notation") on naming organic compounds in IUPAC nomenclature of organic compounds? ...
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Organic chemistry - alkanes step up reaction

Well I was studying organic chemistry, and I came across this reaction for increasing the length of the carbon chain. Upon asking my teacher about the following reaction, she said she was unsure about ...
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2answers
64 views

Why are PTFE and FEP named “ethylene” when they don't have double bonds? [duplicate]

PTFE (Polytetrafluoroethylene) and FEP (Fluorinated ethylene propylene) have the following chemical formulas: It's been years since I have taken organic chemistry, but I do remember alkenes have ...