N. M. R. Experiments on Ketals. XI (1): Shifts of acyclic and cyclic ketals

Autor: F. Borremans, M. J. O. Anteunis, J. Gelan, W. Vandenbroucke, L. Heyndrickx
Rok vydání: 2010
Předmět:
Zdroj: Bulletin des Sociétés Chimiques Belges. 76:533-540
ISSN: 0037-9646
DOI: 10.1002/bscb.19670760906
Popis: Shift values of the methyl and methylene protons of dimethylketals and dioxolanes of cyclic and acyclic carbonyl compounds are affected by substitution, f.i. the ring size in 1, 3 dioxaspiranes. No simple relation could be obtained, and the influence of ring strain (bond hydridization) is not important. The difference in the general trend between dioxolanes and dithiolanes is observed. No simple theory concerning shift dependence on fairly remoted magnetic anisotropy seems possible.
Databáze: OpenAIRE