Re: INADEQUATE 2D

Nick Burlinson (nick@unixg.ubc.ca)
Thu, 2 Dec 1999 11:58:10 -0800

Dave and Dora,
The 1980 book by Abraham and Loftus, "Proton and Carbon-13 NMR
Spectroscopy" Ed. Heyden has tables of nJcc constants.
1Jcc range from 10(cyclopropane) to 170-175(acetylenes) with majority in
the 35-50 range. The hybridization strongly affects the value as you might
expect.
2Jcc range from 1 -15Hz
3Jcc range from 1-15Hz as well but not many examples for 2J and 3J cases
There must be a more up to date listing of CC coupling constants??
Cheers
Nick

Dr Nick Burlinson
Chemistry Dept
NMR Facility
University of British Columbia
Vancouver BC Canada
V6T 1Z1
Email nick@unixg.ubc.ca
Tel 604-822-6956 or -2847(fax)

----------
> From: David Naugler <dnaugler@sfu.ca>
> To: LANAIS RMN-500 <rmn500@df.uba.ar>;
bruker-users-mail@bloch.cchem.berkeley.edu
> Subject: Re: INADEQUATE 2D
> Date: December 1, 1999 11:23 AM
>
> ----- Original Message -----
> From: LANAIS RMN-500 <rmn500@df.uba.ar>
> To: <bruker-users-mail@bloch.cchem.berkeley.edu>
> Sent: December 1, 1999 3:43 PM
> Subject: INADEQUATE 2D
>
>
> > Dear NMR Bruker Users:
> > I am interested in the INADEQUATE 2D program described in the paper:
> > Investigation of 13C-13C long range couplings in natural-Abundance
> > Samples by:
> > A Bax, R Freeman and S.P. Kempsell, J.Magn.reson., 41, 349-353,(1980)
> > "By removing the necessity of estimating tau values, the proposed
> > extension of the original 13C-13C coupling experiment makes the
> > application to unknown long-range coupling quite general".
> > The INADEQUATE'S 2D described in the Bruker library gives
> > connectivities not the Jc-c.
> > Thanking for your kind attention.
> >
> > Dra. Dora G. de Kowalewski
> >
>
> You're supposed to look up the nJc-c's in a book somewhere. Can't
remember
> where. From memory these would be of the order of:
>
> 1Jc-c 135Hz
> 2Jc-c 35Hz
> 3Jc-c 2Hz
>
> My recollection may be faulty so I welcome correction.
>
> Dave Naugler