Syntheses of 2, 5-dimethyl-(III), 3-ethyl-(VII), 2-methyl-3-ethyl-(XIV), and 2-methyl-5-ethyl-4-isopropylpyrrole (XVIII), and 2-ethyl-3-isopropylpyrrole (XI) were attempted. (III) was prepared, first by the condensation of 2-amino-4-methylpentan-3-one (I) and ethyl acetate to form 2, 5-dimethyl-3-ethoxycarbonyl-4-isopropylpyrrole (II) which was hydrolyzed by heating with potassium hyroxide and decarboxylated, and confirmed as its picrate. (VII) was prepared by the condensation of 1-amino-3-methyl-butan-2-one (IV) and ethyl acetopyruvate to form 2-carboxy-3-acetyl-4-isopropylpyrrole (V) and, per se or after decarboxylation to 3-acetyl-4-isopropylpyrrole (VI), submitted to the Wolff-Kischner reduction. The structure of (VII) was confirmed by its oxidation to ethylisopropylmaleinimide (VIII). (XI) was prepared by the Friedel-Crafts reaction to 2-methoxycarbonyl-4-isopropyl-5-acetylpyrrole (X) and its subsequnt reduction by the Wolff-Kischner method. This was confirmed as the picrate and also by deriving it to isopropylmaleinimide (XII) by oxidation. In an attempt to obtain (XIV), (IV) and acetylacetone were condensed to form 2-methyl-3-acetyl-4-isopropylpyrrole (XIII) and submitted to the Wolff-Kischner reduction from which a pyrrole compound was obtained whose infrared absorption spectrum was identical with that of the pyrrole compound obtained by the Friedel-Crafts reaction of 2-methyl-3-ethoxycarbonyl-4-isopropylpyrrole (XV) to form 2-methyl-3-ethoxycarbonyl-4-isopropyl-5-acetylpyrrole (XVI) and submitted to the Wolff-Kishner reduction, per se or after saponification and decarboxylation. The two were respectively submitted to N-methylation and reduction to form the N-methylpyrrolidine compounds (XXI) and were found to be identical by the agreement of their infrared absorption curves and the picrates. Dehydrogenation of the pyrrolidine compound hereby obtained gave the original N-methylpyrrole compound. No detailed examinations have been as to the structure of the pyrrole compounds obtained during these syntheses.