The HMBC (Heteronuclear multiple bond correlation) spectrum confirms the presence of 3-alkylpyridine and also showed the attachment of both the amino and the carbinol functions to the same methine group
, hence the side chain is 2-hydroxymethylaminotrdecanyl group.
All signals are broader and show shift to higher field, for example, methine group
signal (C=CH) exhibited a shift from 6.88 ppm and showed signal at 2.88 ppm.
Signals at 4.65 ppm and 8.2 ppm from protons of methine group
linked to oxygen atom of carbamate group-CH-O(CO)-NH-and from nitrogenadjacent proton appear in the spectrum .
A low field methine group
at [[delta].sub.H] 4.46 ppm might be due to an attachment of an oxygen to the carbon bearing this proton.
Development of abnormal Fischer indolization of ortho-methoxyphenylhydrazone to provide a synthetic method for useful indole derivatives possessing an active methine group
at C6 and novel 3,6'-biindole derivatives.
Icli, New Thiophene-Based Azo Ligands Containing Azo Methine Group
in the Main Chain for the Determination of Copper(II) ions, Dyes Pigments., 75, 11 (2007).
The resonance peak at 5.22 ppm corresponds to the methine group
connecting with the ester bond (26), (27).
The methine group
is represented by V3 (HV) and B3 (HB) at 67-77 ppm.
Occasionally conversion was also calculated by 1H NMR from the relative intensity of the methine group
of the monomer and the polymer ([Delta][CH.sub.PL-LA] = 5.16 ppm, [Delta][CH.sub.L-LA] = 5.02 ppm).
Analysis of the [sup.1]H and [sup.13]C NMR data of 2 (Table 1) suggested that this compound shares several structural similarities with cleroindicin E (3) , except for major differences in the resonances associated with the additional methyl and oxygenated methine groups
. The [sup.1]H-[sup.1]H COSY spectrum of 2 was observed to exhibit proton correlations between H-5 and H-6, between H-7 and H-8, between H-2 and H-3, and between H-9 and H-10 (Figure 2).
The methyl and methine groups
of lactate occur as a doublet at 1.31 ppm and a quartet at 4.09 ppm, respectively.
These radicals mainly contained two species, one resulting from H abstraction of methylene or methine groups
formed a chain radical, and the other from radical addition of nitrile groups formed a polyimine radical .