What is Iupac: Definition and 47 Discussions

The International Union of Pure and Applied Chemistry (IUPAC ) is an international federation of National Adhering Organizations that represents chemists in individual countries. It is a member of the International Science Council (ISC). IUPAC is registered in Zürich, Switzerland, and the administrative office, known as the "IUPAC Secretariat", is in Research Triangle Park, North Carolina, United States. This administrative office is headed by IUPAC's executive director, currently Lynn Soby.IUPAC was established in 1919 as the successor of the International Congress of Applied Chemistry for the advancement of chemistry. Its members, the National Adhering Organizations, can be national chemistry societies, national academies of sciences, or other bodies representing chemists. There are fifty-four National Adhering Organizations and three Associate National Adhering Organizations. IUPAC's Inter-divisional Committee on Nomenclature and Symbols (IUPAC nomenclature) is the recognized world authority in developing standards for the naming of the chemical elements and compounds. Since its creation, IUPAC has been run by many different committees with different responsibilities. These committees run different projects which include standardizing nomenclature, finding ways to bring chemistry to the world, and publishing works.IUPAC is best known for its works standardizing nomenclature in chemistry, but IUPAC has publications in many science fields including chemistry, biology and physics. Some important work IUPAC has done in these fields includes standardizing nucleotide base sequence code names; publishing books for environmental scientists, chemists, and physicists; and improving education in science. IUPAC is also known for standardizing the atomic weights of the elements through one of its oldest standing committees, the Commission on Isotopic Abundances and Atomic Weights (CIAAW).

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  1. A

    Chemistry Choosing principal chain in the nomenclature of organic compounds

    In this question, I am not sure as to which of the following two chains should be considered as the principal chain. Approach 1 (7 carbon chain, 2 substituents): 4-methyl-4-(1,1-dimethylethyl)heptane Approach 2 (6 carbon chain, 4 substituents): 2,2,3-trimethyl-3-propylhexane Clearly, the...
  2. samy4408

    Searching for a reliable resource to practice IUPAC nomenclature

    Hello, I just learned the bases of IUPAC nomenclature and I couldn't find a good and reliable resource for problems to practice. if you know one please share it with me . thanks.
  3. S

    Chemistry IUPAC Naming of 3-Bromo Phenyl Chloro Ketone

    The following structure was given, and I have to name the compound. My guess is that the compound is called 3-bromo phenyl chloro ketone, but I am not sure. Can you tell me if my answer is correct, and also tell me how to tackle the IUPAC naming for this compound? Thank you!
  4. NoahCygnus

    What is the IUPAC name of this organic compound?

    Well I have two possible answers, it's either 1-(cyclopent - 1', 4'- dienyl) methyl ethan-1-ol or 1-methyl - 1 - (cyclopent-1',4'-dienyl) ethan-1-ol. Unfortunately the answer wasn't provided in the textbook.
  5. aatari


    I don't understand why CH3CH2C(CH3)2CH(CH2CH3)CH3 is 2 ethyl-3,3 dimethyl - pentane and not 3-methyl-4,4-dimethylhexane. When I expand the condensed formula above and count the longest carbon chain, it seem it is a hexane rather than pentane. Can someone please clarify? Homework Statement Write...
  6. Krushnaraj Pandya

    IUPAC Nomenclature: 2-Oxo-cyclopentanitrile or 2-Cyano-cyclopentanone?

    Homework Statement Which name is more correct, 2-oxo-cyclopentanitrile or 2-cyano-cyclopentanone 2. The attempt at a solution The priority of CN group is higher than ketone, so the first name should be correct but the second name is mentioned in my textbook
  7. Krushnaraj Pandya

    IUPAC Names for Chlorinated Methylbenzenes: Analysis & Solutions

    Homework Statement among these, which are acceptable IUPAC names, 1-chloro-4-methylbenzene 4-chlorotoluene 4-methylchlorobenzene 1-methyl-4-chlorobenzene 2. The attempt at a solution 1)First option seems correct but is chlorine a higher priority group than methyl?? or does chlorine get a...
  8. Krushnaraj Pandya

    Can I Learn Organic Chemistry from a Textbook Alone?

    Homework Statement My only doubt while solving a larger problem is whether 4-Ethyl,3,3-Dimethyl Hexane and 3-Ethyl,4,4-Dimethyl Hexane equivalent?
  9. C

    IUPAC Names of Organic compounds (3)

    Homework Statement Name the following alcane according to the IUPAC rules: Homework EquationsThe Attempt at a Solution Thank you for helping me! Cro
  10. C

    IUPAC Names of Organic compounds (2)

    Homework Statement Name the following compound according to the IUPAC rules: Homework EquationsThe Attempt at a Solution Help me with the answer, please!
  11. C

    IUPAC Names of Organic compounds

    Homework Statement Name the following compound according to the IUPAC rules: Homework EquationsThe Attempt at a Solution Comment on my attempt, please.
  12. Wrichik Basu

    IUPAC Name of EDTA: 2,2′,2″,2′″-(ethane-1,2-diyldinitrilo-)κ^2N

    As per IUPAC Nomenclature of Inorganic Chemistry, the correct name of the edta chelate is $$\text{2,2′,2″,2′″-(ethane-1,2-diyldinitrilo-} κ^2 \text{N)tetraacetato-}κ^4O $$ As far as I know, edta coordinates through Nitrogen and Oxygen atoms, and there is no metal-carbon bond. On the other hand...
  13. Wrichik Basu

    Query on IUPAC nomenclature of coordination complexes

    I could finally get a copy of the Red Book 2005 from a library. In the chapter dedicated to nomenclature of coordinate complexes, while explaining the κ-system of specifying donor atoms, the following two examples were given (among many others): Can anyone explain how the naming is done for...
  14. donaldparida

    IUPAC nomenclature for many multiple bonds

    My previous Chemistry teacher while teaching IUPAC nomenclature said that the double bond is always given greater priority over the triple bond and the numbering of the carbon atom chain is done in such a way that the double bond gets the lowest possible number while my present Chemistry teacher...
  15. RoboNerd

    Quick question on IUPAC organic naming

    Hi everyone. I was bashing my head against this compound. I thought that the correct name for it was 4-ethyl-1-heptanol since apparently the longest parent chain has eight carbons. Could anyone please advise if my answer is correct, and if not, what I did wrong? Thanks in advance
  16. M

    IUPAC Naming: Troubleshooting Mistakes

    Homework Statement Give the IUPAC name for the following compound. Homework EquationsThe Attempt at a Solution However, the 4 and 7 were incorrect in the blanks. I'm not sure what went wrong.
  17. 8008jsmith

    .Name That Compound: IUPAC Naming Challenge

    Homework Statement http://postimg.org/image/t2uxlnsdh/ What is the IUPAC name of this compound? 2. The attempt at a solution I have tried: 5-chloro-1,4-dimethyl-cyclohexene, 4-chloro-2,5-dimethyl-cyclohex-1-ene, and 5-chloro-1,4-dimethyl-cyclohex-1-ene
  18. A

    IUPAC naming - choosing the main branch doubts

    What are the rules for choosing main branch ? Wikipedia states - "Identification of the parent hydrocarbon chain. This chain must obey the following rules, in order of precedence: 1 It should have the maximum number of substituents of the suffix functional group. By suffix, it is meant that...
  19. Q

    Nomenclature - IUPAC and Common Names

    Homework Statement What if we stuck with the IUPAC name and called the isopropyl group a 1-methylethyl group? That would definitely reverse the alphabetical priorities; because the substituents here on the hydrocarbon are on equivalent positions, we must give the lower number to the...
  20. Q

    1-chloro-3-methylcyclobutane - IUPAC name

    Homework Statement Name this molecule Homework Equations Naming cycloalkanes: 1) The functional groups should receive the lowest carbon number. 2) Any substituents are then assigned carbon numbers. The Attempt at a Solution Following the above two rules, shouldn't the molecule therefore...
  21. kq6up

    What is the IUPAC Name for Ethyl-Methyl-Ester?

    http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=12340#itabs-3d What would the IUPAC name for the above molecule be? Thanks, Chris Maness
  22. Conservation

    IUPAC Naming Questions-Substituents and Bonds

    Hi all, couple of questions in the Official IUPAC naming rules for organic compounds: 1. How do I name organic molecules with both double/triple bonds and substituent? Do I name Both? For ex.: 2-Methyl-4-pentene vs. 2-Methylpentene? 2. If the double/triple bond and the substituent is in the...
  23. F

    On the IUPAC nomenclature of ethers and esters

    Hello, I was wondering if there is a systematic procedure to follow when naming complex organic molecules containing ethers and esters. By "complex" I mean organic molecules that contain multiple ether/ester groups and possibly within multiple different branches of the molecule. 1.How to...
  24. O

    Name the following molecule (common name and IUPAC)?

    http://img43.imageshack.us/img43/2916/95953925.jpg I understand molecule #1 is sec-pentylcyclohexane But how would you call molecule 2? Please give common and IUPAC names (no need for too much detailed explanations) Thank you.
  25. J

    IUPAC Nomenclature: 3-Chlorobutane-1,2-diol

    Homework Statement Give the IUPAC name of the following compound OH  Cl |   | C-C-C-C   |   OH (Note:Hydrogen atoms are not drawn) Homework Equations The Attempt at a Solution Model answer:3-chlorobutane-1,2-diol Why it is called 3-chlorobutane-1,2-diol instead of...
  26. K

    IUPAC naming for a sidechain with double bond?

    As shown in this picture. How would you do the naming for a sidechain that has double bonds? Or does the double bond take priority over the length of the chain?
  27. nukeman

    Need help with IUPAC name of a metal for Physics class.

    Homework Statement One part of this problem is the following: Give the IUPAC name for each of the following: Ti(CO3)2 I thought it would be diTitanium Carbon Trioxide But its apparently Titanium carbonate Can someone please try and explain this better for me so I can...
  28. nukeman

    Giving the IUPAC name for Al2(Cr2O7)3 ?

    Homework Statement I don't understand how to do this. There is 2 of them I am not sure of? 1st: As2S3 - Is the correct IUPAC name: DiAresenic Trisulfide? 2nd: Al2(Cr2O7)3 - IS it DiAluminum ... Need help with this. How do you get the IUPAC name from this. Any help would be great...
  29. W

    IUPAC dilemma on naming a toxin, any pro organic chemists out there?

    So I came across a cool toxin, and saw that people have not assigned an IUPAC name to it, so I took on the challenge. The compound of interest is Batrachotoxinin A unc. edu/depts/mtcgroup/litmeetings/batrachotoxinin.pdf In the second slide Batrachotoxinin A has an R which is an H...
  30. V

    Different Naming Systems in Textbooks: IUPAC Standards

    I have encountered different naming systems in textbooks. Ignoring cis/trans, for example, some textbooks would give the name 2-butene, while others give but-2-ene. Are they both acceptable? The newer textbook uses the second type of naming, while the older textbook uses the first...
  31. H

    Unravelling the Mystery of IUPAC: Writing Fe2S3

    Homework Statement How do you write Fe2S3 in IUPAC method, it would be great if you could explain and show some examples of IUPAC methods. The Attempt at a Solution I just want to see how you do one of them then I can probably get the rest, thanks a lot.
  32. P

    Chemistry Name the following organic molecule (IUPAC)

    Homework Statement Name the following (organic) molecule: http://img827.imageshack.us/img827/1883/organicmolecule.png Uploaded with ImageShack.usHomework Equations The Attempt at a Solution Would this be 3-pentene? The root has to be "pent" because that's the longest carbon chain, right?
  33. A

    What is the IUPAC name for this structure?

    I am trying to find the IUPAC name for this structure. I a keep coming across 1,3-diol cyclohexane, but my homework online keeps saying its wrong. Does anyone know what this structure is? Thanks:)
  34. P

    Chemistry Solution check for Complex Molecule IUPAC Naming

    Homework Statement a) Given the IUPAC name to the chemical formulas: {\left[ {Ni{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }} \left[ {CrC{l_3}{{\left( {N{H_3}} \right)}_3}} \right] {\left[ {Co{{\left( {N{O_2}} \right)}_6}} \right]^{3 - }} b) Give the metal oxidation state...
  35. V

    IUPAC Naming Rules: 2,5-Dichlorobenzene

    Homework Statement What is the IUPAC name for the following compound. (Benzene with two chlorines sticking out one at Carbon 2 the other at Carbon 5) Homework Equations The Attempt at a Solution I understand that the compound's name has to be something like 2,5-dichlorobenzene but...
  36. F

    Does Anybody Know How to Name the IUPAC of these Compounds

    Homework Statement Does anyone know how to name these? I know how to name ethers when there is only one but these are just insane. IUPAC of course.Homework Equations 1. O ||...
  37. L

    Is 4-Ethyl-2,2,7-Trimethyloctane the Correct IUPAC Name?

    1. Provide proper IUPAC name for the compound below. 2. (CH3)2CHCH2CH2CH(CH2CH3)CH2C(CH3)3 3. Would the correct name be 4-ehtyl-2,2,7-trimethyloctane?
  38. S

    IUPAC nomenclature assistance request

    Homework Statement My professor set us an online quiz in IUPAC nomenclature. I managed to get all of the problems correct, except for one. The graphic shows the molecule and my attempt at a solution. http://img67.imageshack.us/img67/8673/14ne9.gif The attempt at a solution If you can't...
  39. R

    Number Carbon Atoms IUPAC Nomenclature

    Please tell me how to number the carbon atoms in the longest chain. How can I simultaneously have the smallest positions for all the functional and alkyl groups at the same time??
  40. L

    IUPAC name of a branched chain hydrocarbon

    Hi, I'm just starting high-school organic chemistry and as is customary I've begun with nomenclature of organic compounds. Till now I've covered aliphatic hydrocarbons and will be starting on nomenclature of functional groups. The following problem from K.L. Chugh's Senior Chemistry Vol. II...
  41. N

    Naming Organic Compounds: IUPAC Naming

    IUPAC naming! Hey folks, I just wonder how would you name this compound CH3CHBrCH2ClCH2 is it 3- Bromo -1- chloro butane or 2- bromo 4- chloro butane another question : does CH3OCH3 form a hydrogene bond or not? Any help would be greatly appreciated
  42. U

    Help with IUPAC: Count Unsaturation, Draw Structures

    How many elements of unsaturation are implied by the molecular formula C8H10ClNO? Draw Three structure, one containing ether and amine group, one containing amide group, one containing amine and ketone group. I have no clue where to begin and read the chapter. as long as it is...
  43. N

    Learn IUPAC Nomenclature for Organic Compounds

    Can anybody tell me a good site for learning IUPAC Nomenclature for Organic Compounds, please?
  44. C

    Online course on drawing the structure given the IUPAC names

    Does anyone know a good website that gives info on drawing the structure of organinc molecules? Or can anyone teach me?
  45. R

    IUPAC Names for CuCl, Plumbic Iodide, NH4ClO, SnH4, and KMnO4

    What would be th IUPAC names for these: a) CuCl...is it Copper chloride c) plumbic iodide...? e)NH4ClO...amonium something?? i) SnH4... tin tetrehydroxide? k) KMnO4...?
  46. K

    What is the correct IUPAC name for compound (b) with a chiral center on C2?

    Which one is the correct systematic name for compund (a), N-hydroxyaniline or N-phenylhydroxylamine ? Also, how should we name compound (b), 2,2-dichloro-1-ethylcycloheptane or 1,1-dichloro-2-ethylcycloheptane ? http://www.angelfire.com/alt2/antiwork