The behaviour of substituted 1,3-oxazolidin-2-ones (1) and 1,3-oxazolin-2-ones (2) on treatment with acid is reported. Electrophylic addition of iminium cations to 1,3-oxazolin-2-onic monomers occurs, yielding the kinetically preferred dimers (3). The elimination pathway to 3 is in direct competition with the formation of the cyclodimerisation products resulting from a thermodynamically controlled process. The stereochemistry of the cyclodimers is discussed on the basis of X-ray analysis. Qualitative energetic considerations on the overall reaction and NMR characteristics are discussed using deuterium labelling experiments.
Competing dimerisation of some N,O-heterocyclics. Thermodynamic versus kinetic control of isomeric products / Cum, G; Giannetto, P; Sindona, Giovanni; Uccella, N.. - In: TETRAHEDRON. - ISSN 0040-4020. - 36:6(1980), pp. 745-751.
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Titolo: | Competing dimerisation of some N,O-heterocyclics. Thermodynamic versus kinetic control of isomeric products |
Autori: | |
Data di pubblicazione: | 1980 |
Rivista: | |
Citazione: | Competing dimerisation of some N,O-heterocyclics. Thermodynamic versus kinetic control of isomeric products / Cum, G; Giannetto, P; Sindona, Giovanni; Uccella, N.. - In: TETRAHEDRON. - ISSN 0040-4020. - 36:6(1980), pp. 745-751. |
Handle: | http://hdl.handle.net/20.500.11770/136950 |
Appare nelle tipologie: | 1.1 Articolo in rivista |