Safety of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Electrophilic heteroaromatic substitutions. XI. Thallium in pyrrole chemistry. Formation of C-pyrrylthallium derivatives. Author is Monti, Donato; Sleiter, Giancarlo.
Reaction of several pyrrole derivatives with Tl(III) salts was investigated under different exptl. conditions. C-Thallation is dependent on what position (α or β) of the pyrrole nucleus is amenable to attack, and on the nature of the thallating agent. Yields are strongly influenced by electronic and steric effects of the substituents already present in the pyrrole nucleus and by the nature of the reaction medium. Spectroscopic and anal. data for the C-pyrrylthallium derivatives prepared are reported. E.g., treating pyrroles I (R = H; R1 = Me, Et) with Tl(OAc)3 in MeCN or CH2ClCH2Cl gave 37-79% I [R = (AcO)2Tl; same R1].
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