methine group


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methine group

[′me‚thēn ′grüp]
(organic chemistry)
HC≡ A radical consisting of a single carbon and a single hydrogen. Also known as methenyl; methylidyne.
References in periodicals archive ?
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 [16].
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) [28], 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 [22].