Pyrrole studies. VI. The N-H stretching frequencies of substituted pyrroles: methyl and carbethoxy substituents was written by Jones, R. Alan;Moritz, A. G.. And the article was included in Spectrochimica Acta in 1965.Name: Ethyl 4-methyl-1H-pyrrole-3-carboxylate This article mentions the following:
The ir spectra of some substituted pyrroles were examined in the N-H stretching region under high resolution in CCl4. In all cases 2 concentration-independent bands were observed. For compounds with a carbethoxy group in the α position, this is attributed to rotational isomerism. In other cases the 2nd band arises from interaction with the out-of-plane deformation vibration of the N-H group, producing a hot band. An analysis of the data for pyrroles containing Me and carbethoxy substituents, shows that the effect of each group on the N-H stretching frequency is independent of other substituents and is additive. The frequencies can be represented by a single equation, νNH = 3496 – 9nαCH3 + 2nβCH3 – 13nβCO2Et – {1431nαCO2Et, where nα and nβ are the number of substituents in the α and β positions, resp. In the last term, the coefficient is 14 or 31. In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7Name: Ethyl 4-methyl-1H-pyrrole-3-carboxylate).
Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Name: Ethyl 4-methyl-1H-pyrrole-3-carboxylate
Referemce:
Ester – Wikipedia,
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