Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

COLOC long range coupling

Two-dimensional C//correlations such as C//COSY or HC HMQC and HSQC provide the Jqh connectivities, and thereby apply only to those C atoms which are linked to H and not to non-protonated C atoms. Modifications of these techniques, also applicable to quaternary C atoms, are those which are adjusted to the smaller Jqh and Jqh couplings (2-25 Hz, Tables 2.8 and 2.9) Experiments that probe these couplings include the CH COLOC (correlation via long range couplings) with carbon-13 detection (Fig. 2.16) and HC HMBC (heteronuclear multiple bond coherence) with the much more sensitive proton detection (Fig. 2.17)... [Pg.39]

To be fair, we must point out that this type of experiment is extremely sensitive to the parameters chosen. Various pulse sequences are available, including the original COLOC (Correlation by means of Long range Coupling) as well as experiments variously referred to as HMBC (Heteronuclear Multiple-Bond Correlation) and HMQC (Heteronuclear Multiple-Quantum Correlation). Depending on the parameters chosen, it is often not possible to suppress correlations due to one-bond coupling ... [Pg.45]

COLOC correlation spectroscopy via long-range couplings... [Pg.312]

COLOC correlation through LOng range Couplings... [Pg.245]

There is a carbon detected analogue of the HMBC experiment called COLOC (Correlated spectroscopy for Long range Couplings) that predated the experiment treated here. The COLOC is not used much any more and we will not give any examples. [Pg.257]

COLOC Correlation spectroscopy of long range coupling... [Pg.194]

COLOC correlation via LOng-range Coupling (CH multiplicities through two or three bonds)... [Pg.140]

COLOC Correlation through long-range coupling 6.5.2... [Pg.373]

Characterization. The structures of ascididemin (323), 11-hydroxyascididemin (324), and 8,9-dihydro-ll-hydroxyascididemin (325) were assigned on the basis of extensive H- and C-NMR studies including H/ correlation by long-range coupling (COLOC), and selective intensive nucleus enhancement by polarization transfer (INAPT). Their spectral data were compared with those of similar alkaloids such as neocalliactine (366), bromoleptoclinidinone (357) (151,161), and amphimedine (297) (134). [Pg.150]

C-H correlation over multiple bonds Heteronuclear multiple bond correlation HMBC), correlation by long-range couplings (COLOC)... [Pg.1064]

See other pages where COLOC long range coupling is mentioned: [Pg.407]    [Pg.259]    [Pg.374]    [Pg.1081]    [Pg.401]    [Pg.132]    [Pg.443]    [Pg.15]    [Pg.324]    [Pg.222]    [Pg.46]    [Pg.222]    [Pg.192]    [Pg.370]    [Pg.27]    [Pg.255]    [Pg.39]    [Pg.222]    [Pg.259]    [Pg.225]    [Pg.225]    [Pg.240]    [Pg.20]    [Pg.23]    [Pg.227]    [Pg.539]    [Pg.576]    [Pg.19]    [Pg.361]   


SEARCH



COLOC

Colocalization

Long range

Long-range coupling

© 2024 chempedia.info