Guerrero-Alvarez JA, Mas-Ku WP, Garcías-Morales C, Ariza-Castolo A. Relative acidities and structure analysis of cis and trans isomers of 1,5-oxazaspiro[5.5] undecane derivatives by multinuclear magnetic resonance.
MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010;
48:356-361. [PMID:
20306516 DOI:
10.1002/mrc.2592]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The relative acidities of the cis and trans isomers of a series of 1,5-oxazaspiro[5.5]undecane derivatives were determined by measuring DeltapK in acid-base titrations followed by (1)H NMR. Relative structural stabilities were determined by measuring substituent chemical shift and gamma-gauche effects in (13)C, (15)N, and (17)O NMR. Crystallographic characterization of a model spiro[5.5]undecane is presented to support the basicity in solid state.
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