Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: fetusinprogress on April 02, 2008, 10:54:48 AM
-
Could someone help me on drawing the following structures?
1) meso-3,4-dibromohexane
2) cyclopentene oxide
3) trans-1,2-dibromopentane
4) Z-2-phenyl-2-butene
5) meso-3,4-hexanediol
6) R-2-ethylpentanenitrile
7) acetaldehyde + propionaldehyde
propyne + isobutylene
-
Yes. I recognize their names, so I could. Next question. ;D
OK, jus' playin' with you, we do like to see a little effort on these boards, so take some stabs, make some drawings in a paint program and post 'em, or let us know where you're stuck. There are always noobs who dump complete answers to any question asked, presumably for empathic brownie points. But even they get bored quickly, and stop answering large stacks like yours.
-
http://en.wikipedia.org/wiki/Acetaldehyde
-
http://en.wikipedia.org/wiki/Acetaldehyde
5 bucks says your answer earns you a "not good enough" from the original poster. ;D
-
can you tell me how to upload from my paint program?
-
Save as gif, click on Additional options below edit field when posting.
-
(http://img)
-
ok here is what i have so far
-
For cyclopentene oxide, I like the first one better than the second one, your instincts are correct -- it's name starts with pent-, and cyclo, so you've made a circular 5 carbon ring. Don't forget the -ene, though. Also, you've drawn the oxygen as a carbonyl group, and compounds with those don't bear the name oxide. If you have to guess, can you think of another common organic oxide, and look up it's structure.
-
i looked up nitric oxide...am i lacking a bond?
-
i looked up nitric oxide...am i lacking a bond?
No, that's an inorganic oxide, I meant something else, made of carbon and hydrogen, with the name "oxide"
-
I am kind of numb and feeling more confused now than when I started :)
-
http://en.wikipedia.org/wiki/Ethylene_oxide
-
revised...is this right
-
http://en.wikipedia.org/wiki/Ethylene_oxide
It was hard to find that one (or any other organic oxide)by searching for "oxide", I'm guessing that is an informal name. But that was the molecule I was going for.
-
so was the revised structure correctly showing cyclopentene oxide??
-
so was the revised structure correctly showing cyclopentene oxide??
No, I don't like the double bond to the oxygen, that is a carbonyl- group, and it gives compounds names like, -dehyde and -one, see here:
http://en.wikipedia.org/wiki/Carbonyl, also check Borek:'s link, it's where I wanted you to go, anyway. It is quite a common industrial chemical, so you should get to know it.
-
ok--I think I got it---
how is this!
-
would you mind looking over my other structures that i have worked on...
and thanks for your help...i do appreciate it....
-
assign names for structures
cyclopentanone
cyclopentenone
cyclopentene oxide
-
the bottom is cyclopentene oxide
-
the bottom is cyclopentene oxide
Unfortunately, no.
Compare how the structure of ethylene oxide (from Borek and Arkcon's prod) compares to ethylene.
What does cyclopentene have in common with ethylene, and hence what is the structure of cyclopentene oxide?
-
okay--i really think i may have the right idea now....
-
the correct structure is the one to the far right..
???
-
Great, now change that ethylene oxide into cyclopentene oxide -- what is the difference?
-
the correct structure is the one to the far right..
???
Bravo! :)
-
ethylene has 2 carbons where cyclopentene has 5
-
can we work on my other structures?
-
The others that you've drawn look OK too, I think.
Not sure about "trans-1,2-dibromopentane though". But that's not necessarily your fault - I can't really see how you get cis / trans forms there - have you copied the name right?
5 is essentially the same as 1, except you have -OH, not -Br. How are you doing for 6 & 7 ?
-
I haven't attempted to finish with 6 and 7....I will do that right now.
thank you ~!
-
here is a 2 ethylpentane...where do I attach the
nitrile
-
As it isn't mentioned, I'd put it at the 1 position, but be careful not to add an extra carbon-triple bond nitrogen there, as the carbon is already in place.
It may be easier if you start with pentanenitrile, then add an ethyl to the 2-position. It should make no difference in this case. Seehttp://www.chem.uic.edu/web1/OCOL-II/WIN/CH21/F1.HTM (http://www.chem.uic.edu/web1/OCOL-II/WIN/CH21/F1.HTM)
Are you happy assigning priorities and hence drawing the (R) form?
-
here is a 2 ethylpentane...where do I attach the
nitrile
2-ethylpentane is a nonsense name