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Long-range C/H correlation

Finally, a 2D COLOQ experiment showed the following long range C-H correlations ... [Pg.248]

DEPT, H-H COSY, TOCSY, short range C-H chemical shift correlation and long range C-H chemical shift correlation experiments were performed on Bruker AMX 360 and AM400 instruments using acetone-d6 as solvent. C-H chemical shift correlation experiments were carried out with inverse detection. Standard pulse sequence programs provided with the instruments were used for all 2-D experiments. [Pg.131]

The partial long range C-H chemical shift correlation spectrum presented in figure 3 shows signals from the aliphatic side chains of the trimeric compound. This 2-D NMR experiment provides information about the H-C connection 2 to 3 bonds away from the carbon (coupling constants less than 20 Hz). For example, Ha shows... [Pg.134]

Figure 3. Partial long range C-H chemical shift correlation NMR spectrum of compound 20. Figure 3. Partial long range C-H chemical shift correlation NMR spectrum of compound 20.
The modified heteronuclear shift-correlation experiment described by Bauer et al,54 has the advantage of giving 2D-spectra with proton shifts in the F, dimension and long-range C,H splittings. However, its overall sensitivity is low because of relaxation during relatively long delays, and the resolution obtained is only to the nearest Hertz. [Pg.21]

SALP I ester carbonyls Long-range C/H shift correlation... [Pg.59]

In homonudear shift-correlation experiments like COSY we were concerned with the correlation of chemical shifts between nuclei of the same nuclear species, e.g., H with H. In heteronuclear shift-correlation experiments, however, the chemical shifts of nuclei belonging to different nuclear species are determined (e.g., H with C). These may be one-bond chemical shift correlations, e.g., between directly bound H and C nuclei, or they may be long-range chemical shift correlations, in which the interactions... [Pg.254]

The HMBC spectrum of vasicinone along with the H-NMR assignments are shown. Determine the H/ C long-range heteronuclear shift correlations based on the HMBC experiment, and explain how HMBC correlations are useful in chemical shift assignments of nonprotonated quaternary carbons. [Pg.295]

The HMBC spectrum of vasicinone displays long-range heteronuclear shift correlations between the various H/ C nuclei. These correlations are very helpful to determine the C-NMR chemical shifts of quaternary carbons and allow the interlinking of the different substructures obtained. [Pg.330]

Fig. 28 C, H correlation spectrum for compound 1 (set for long-range coupling, 400 MHz, 5% in CDC13, measurement time 18 min, inverse detection)... [Pg.45]


See other pages where Long-range C/H correlation is mentioned: [Pg.111]    [Pg.5]    [Pg.52]    [Pg.266]    [Pg.272]    [Pg.7]    [Pg.31]    [Pg.148]    [Pg.151]    [Pg.354]    [Pg.19]    [Pg.147]    [Pg.149]    [Pg.152]    [Pg.174]    [Pg.190]    [Pg.111]    [Pg.5]    [Pg.52]    [Pg.266]    [Pg.272]    [Pg.7]    [Pg.31]    [Pg.148]    [Pg.151]    [Pg.354]    [Pg.19]    [Pg.147]    [Pg.149]    [Pg.152]    [Pg.174]    [Pg.190]    [Pg.259]    [Pg.235]    [Pg.361]    [Pg.259]    [Pg.3240]    [Pg.130]    [Pg.637]    [Pg.405]    [Pg.156]    [Pg.273]    [Pg.331]    [Pg.46]    [Pg.37]    [Pg.44]    [Pg.1]    [Pg.9]    [Pg.77]    [Pg.40]    [Pg.47]    [Pg.222]   
See also in sourсe #XX -- [ Pg.71 ]




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C/H correlation

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H Correlation

Long range

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