ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: pHysiX on May 26, 2009, 06:56:06 am

Title: C NMR
Post by: pHysiX on May 26, 2009, 06:56:06 am

How many peaks are expected for C NMR for cyclohexanol, cyclohexan-1,2-diol, cyclohexan-1,3-diol and cyclohexan-1,4-diol?

I am thinking 3, 3, 4, 2.

Please help because initially, i managed to think of the spectrum correctly but doing it again, i got my answer wrong T_T.....

Thanks a heap in advance!

Title: Re: C NMR
Post by: Mao on May 26, 2009, 09:06:40 am

Cyclohexanol: 4
Cyclohexan-1,2-diol: 3
Cyclohexan-1,3-diol: 4
Cyclohexan-1,4-diol: 2

Title: Re: C NMR
Post by: mystikal on May 26, 2009, 01:46:47 pm

wow do we actually need to know the c nmr cylcohexane?
what about the H NMR of cylcohexane?
also what does the diol mean?

Title: Re: C NMR
Post by: ed_saifa on May 26, 2009, 01:53:33 pm

diol is two hydroxyl functional groups.

Title: Re: C NMR
Post by: pHysiX on May 26, 2009, 04:17:49 pm

would someone please explain cyclohexanol for me please? haha i can only seem to identify 3 different carbon environments >.<

Title: Re: C NMR
Post by: chem-nerd on May 26, 2009, 05:28:38 pm

C1 is the C with the OH attached

C2 and C6

C3 and C5

C4

=> 4 different environments

Title: Re: C NMR
Post by: pHysiX on May 26, 2009, 05:48:59 pm

y is C4 a different environment?

C3 and C5 both are attached to 2 hydrogens and are surrounded by 4 hydrogens. C4 is in that same configuration...

haha...is there meant to be some hidden catch with C NMR that my teacher left out? thanks again for the help. really appreciate it =] =] =]

Title: Re: C NMR
Post by: chem-nerd on May 26, 2009, 07:11:32 pm

not exactly the same question but it's similar enough that it should help you work it out

http://vcenotes.com/forum/index.php/topic,12787.msg143864.html#msg143864

Title: Re: C NMR
Post by: pHysiX on May 26, 2009, 07:28:11 pm

ooooo thanks chem nerd!!!!! legend!!!!

Title: Re: C NMR
Post by: monokekie on May 26, 2009, 09:21:49 pm

The diol part reminds me of diacid..


so how do you name diacids? for example HOOCCH2CH2COOH, is it called butanoic diacid? or dibutanoic acid?

anyone?

Title: Re: C NMR
Post by: ed_saifa on May 26, 2009, 09:35:41 pm

Butanedioic acid or the more common name succinic acid

Title: Re: C NMR
Post by: monokekie on May 26, 2009, 09:43:55 pm

 :Dtyty