Liu, Dachun et al. published their research in Journal of Organic Chemistry in 2003 | CAS: 2199-49-7

Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Electric Literature of C8H11NO2

Conjugated Macrocycles Related to the Porphyrins. 25.Proton NMR Spectroscopic Evidence for a Preferred [18]Annulene Substructure in Carbaporphyrins from the Magnitude of Selected 4JH,H CH:C-CH3 Coupling Constants was written by Liu, Dachun;Lash, Timothy D.. And the article was included in Journal of Organic Chemistry in 2003.Electric Literature of C8H11NO2 This article mentions the following:

Two new benzocarbaporphyrins with four or five alkyl substituents have been synthesized by the “3 + 1” MacDonald methodol. At lower temperatures, the proton NMR spectrum of the asym. substituted carbaporphyrin I gave two NH resonances, while carbaporphyrin II, which retains a plane of symmetry, gave only one resonance of this kind. As no addnl. peaks were seen for the remaining protons, these data strongly support the proposal that a single tautomer predominates in solution where the two NH protons flank the interior CH. Carbaporphyrin I, which has a CH:CMe unit on the pyrrolic ring opposite the indene moiety, gave a long-range coupling constant of 4JMe,H = 1.3-1.4 Hz. On the other hand, the CH:CMe units of II, which correspond to the pyrrole rings on each side of the carbocyclic moiety, gave 4JMe,H = 0.9-1.0 Hz. These values are in accord with those expected if the exterior carbon-carbon bonds of the pyrrole units next to the indene ring are part of a fully delocalized 18π electron system, while the C:C bond of the remaining pyrrole ring retains substantial olefinic character. In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7Electric Literature of C8H11NO2).

Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Electric Literature of C8H11NO2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics