December 22, 2024, 09:10:03 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Nomenclature-What is the difference between these two?  (Read 4670 times)

0 Members and 1 Guest are viewing this topic.

Offline Aakash

  • Regular Member
  • ***
  • Posts: 39
  • Mole Snacks: +2/-3
Nomenclature-What is the difference between these two?
« on: December 06, 2013, 08:56:32 AM »
The compound is 5-(1-Methylethyl)-2-methyl-octane

can we write it like   2-methyl-5-(1-Methylethyl)-octane ? Why /why not?
Logged

Offline discodermolide

  • Chemist
  • Sr. Member
  • *
  • Posts: 5038
  • Mole Snacks: +405/-70
  • Gender: Male
    • My research history
Re: Nomenclature-What is the difference between these two?
« Reply #1 on: December 06, 2013, 10:06:56 AM »
You mean this molecule?
CC(C)CCC(C(C)C)CCC

in that case the first is more correct, but methyl ethyl!! How about 5-isopropyl-2-methyloctane?

Logged
Development Chemists do it on Scale, Research Chemists just do it!
My Research History

Offline Aakash

  • Regular Member
  • ***
  • Posts: 39
  • Mole Snacks: +2/-3
Re: Nomenclature-What is the difference between these two?
« Reply #2 on: December 06, 2013, 01:58:40 PM »
yes. That is the one. I read that each compound has unique name in IUPAC nomenclature. so only one of those two can be true?
Logged

Offline discodermolide

  • Chemist
  • Sr. Member
  • *
  • Posts: 5038
  • Mole Snacks: +405/-70
  • Gender: Male
    • My research history
Re: Nomenclature-What is the difference between these two?
« Reply #3 on: December 06, 2013, 02:05:20 PM »
Find the longest chain.
The substituents must be placed in the name in alphabetical order.
The numbers must add up to the lowest total.
So 5-isopropyl-2-methyloctane is correct.
Logged
Development Chemists do it on Scale, Research Chemists just do it!
My Research History

Offline Aakash

  • Regular Member
  • ***
  • Posts: 39
  • Mole Snacks: +2/-3
Re: Nomenclature-What is the difference between these two?
« Reply #4 on: December 06, 2013, 02:07:49 PM »
you said isopropyl but I read that iso was used in trivial naming.
Logged

Offline discodermolide

  • Chemist
  • Sr. Member
  • *
  • Posts: 5038
  • Mole Snacks: +405/-70
  • Gender: Male
    • My research history
Re: Nomenclature-What is the difference between these two?
« Reply #5 on: December 06, 2013, 02:09:32 PM »
Iso is an allowed prefix under IUPAC.
Logged
Development Chemists do it on Scale, Research Chemists just do it!
My Research History

Offline Aakash

  • Regular Member
  • ***
  • Posts: 39
  • Mole Snacks: +2/-3
Re: Nomenclature-What is the difference between these two?
« Reply #6 on: December 06, 2013, 02:12:28 PM »
Okay so both the names which I suggested in the question are wrong?
Logged

Offline discodermolide

  • Chemist
  • Sr. Member
  • *
  • Posts: 5038
  • Mole Snacks: +405/-70
  • Gender: Male
    • My research history
Re: Nomenclature-What is the difference between these two?
« Reply #7 on: December 06, 2013, 02:15:19 PM »
Yes, unfortunately.
Logged
Development Chemists do it on Scale, Research Chemists just do it!
My Research History
Pages: [1]   Go Up
« previous next »
Sponsored Links