N.M.R. Experiments on Ketals III. P.M.R. Spectrum and conformations of the glycolketal of 1,2-propanediol with acetone and acetaldehyde

Autor:	M. Anteunis, F. Alderweireldt
Rok vydání:	2010
Předmět:	Magnetic anisotropy chemistry.chemical_compound chemistry Stereochemistry Acetone Acetaldehyde General Chemistry Resonance (chemistry) Medicinal chemistry Acetonide Cis–trans isomerism Spectral line Propanediol
Zdroj:	Bulletin des Sociétés Chimiques Belges. 73:889-897
ISSN:	0037-9646
DOI:	10.1002/bscb.19640731106
Popis:	The P.M.R. spectra of 2,2,4-trimethyl-1,3-dioxolane and both cis and trans 2,4-dimethyl-1,3-dioxolane are qualitatively analysed. The magnetic anisotropy of a methylgroup causes an upfield shift of the cis-γ protons of about 0,15 ppm, and an analogous shift of 0,05 ppm for the cis-γ methyl resonance. This can be used for structure elucidation. In the acetonide and the cis-compound (III) long range coupling between HA and 4-CH3 (see II and III) is observed, while in the trans compound (II) it is not.
Databáze:	OpenAIRE
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