Chemistry of Diazocarbonyl Compounds: XVIII. Synthesis and Spectral Parameters of 1,3-Dialkyl- 3-hydroxy-2-diazoketones View Full Text


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Article Info

DATE

2004-03

AUTHORS

O. V. Zhdanova, S. M. Korneev, V. A. Nikolaev

ABSTRACT

Reduction of the carbonyl groups in cyclic and acyclic 2-diazo-1,3-diketones with sodium tetrahydridoborate in aqueous–alcoholic medium, followed by hydrolysis of the reaction mixture over wet silica gel and chromatographic purification on neutral aluminum oxide, afforded 1,3-dialkyl-3-hydroxy-2-diazoketones in 58–87% yield. Bulky substituents at the carbonyl group considerably reduce the efficiency of the process, and the reduction of cis- and trans-4,6-di-tert-butyl-2-diazocyclohexane-1,3-diones is characterized by low stereoselectivity (de 40–49%). In the IR spectra of 3-hydroxy-2-diazocyclohexanes, absorption bands corresponding to stretching vibrations of “free” axial hydroxy groups are located at higher frequencies (by 20-45 cm-1) than those belonging to equatorial hydroxy groups. These parameters may be useful for conformational analysis of cyclic hydroxy diazo ketones. Stabilization of the E conformation of acyclic hydroxy diazo ketones via intramolecular hydrogen bonding is likely to occur only in nonpolar solvents (CCl4, cyclohexane). More... »

PAGES

316-328

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/b:rujo.0000034964.50578.fb

DOI

http://dx.doi.org/10.1023/b:rujo.0000034964.50578.fb

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1017292858


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