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The tautomerism of hydroxy derivatives of five-membered oxygen, nitrogen, and sulfur heterocycles

โœ Scribed by Brian Capon; Fu-Chiu Kwok

Publisher
Elsevier Science
Year
1986
Tongue
French
Weight
265 KB
Volume
27
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

The unstable enolic tautomers 3-hydroxyfuran, 2-and 3-hydroxythiophene, 3-hydroxy-pyrrole, 3-hydroxy-l-methyl-pyrrole and their benzo-derivatives have been generated in solution and the rate and equilibrium constants for their ketoization determined.

Most hydroxy derivatives of unsubstituted furans, thiophenes, pyrroles and their benzo-derivatives are unstable with respect to their ketotautomers and have never been isolated or detected.' We now report that the 3-hydroxy compounds la -lb and 2a -2d may be generated in mixtures of CD3CN, CD3COCD3 or CDBSOCDs with D20 by hydrolysis of their trimethylsilyl

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Iron Derivatives of Five-membered Carbon
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โœ Prof. Dr. F. Seel; Dipl.-Chem. V. Sperber ๐Ÿ“‚ Article ๐Ÿ“… 1968 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 153 KB ๐Ÿ‘ 1 views

By treating pyrazole ( I ) , imidazole (2), and 1,2,4-triazole (3) with penta-or tetra-carbonyliron, mercury tetracarbonylferrate(rI), ferrocene, or dicarbonylcyclopentadienyliron in the presence or absence of a solvent (benzene, toluene, or mesitylene) we have been able to prepare the almost colorl