. Can. J. Chem. 60,2295Chem. 60, (1982. Several syntheses of the previously unknown 1,2-dihydro-3H-pyrrolo[l,2-a]pyrrole-l-carboxylic acid and various 5-and 6-substituted derivatives thereof have been devised. Some of these processes have been extended to the heretofore unreported 5,6,7,8-tetrahydropyrrolo[l,2-a]pyridine-8-carboxylic acid and 5,6,7,8-tetrahydro-9H-pyrrolo[l,2-a]azepine-9-carboxylic acid derivatives.Two new processes were developed for the conversion of pyrroles into the corresponding pyrrol-2-acetic acid esters. Both processes were based on the use of the readily available ethoxalylpyrrole derivatives as the starting material. One sequence involved saponification of the a-keto ester, followed by Wolff-Kishner reduction of the crude a-keto acid salt and subsequent esterification of the acetic acid derivative thus produced. The second synthesis commenced with reduction of the 2-ethoxalpyrrole with sodium borohydride to the a-hydroxy ester, which was further reduced to the acetic acid ester with an equimolar mixture of triphenylphosphine and triphenylphosphine diiodide.
The influence of the presence of trimethylsilyl and triphenylsilyl groups in substituents of anthraquinone on the properties of anthraquinone vat, acid, and dispersion dyes was investigated.
Summary. The 3-and 4-trimethylsilyl-phthalic anhydrides have been prepared by oxidation of the corresponding o-xylenes and converted into dyestuffs of the type of phthalocyanines, phthaleins and chinophthalones.
Die Umsetzung des Bromids (I) mit dem [aus den Komponenten (II) und (III) gebildeten] Enamin (V) liefert das Pyrrol (IVa) (Hantzsche Pyrrolsynthese) ; Cyclisierung des aus (IVa) über das Mesylat (IVb) erhältlichen Iodids (IVc) gibt das Pyrrolopyrrol (VIa), das über die Stufen (VIb), (VIc) in den Ester (VIIa) bzw. dessen Verseifungsprodukt (VIIb) übergeführt wird.
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