Use of 13C NMR to establish configuration of oximes and
hydrazones of a and b -ionone
M. El Idrissi*, S. Faraj
Département de Chimie, UFR Chimie Organique,
Faculté des Sciences, B.P. 4010, Bni M’hammed, Meknès, Maroc
* Corresponding author. E-mail: firstname.lastname@example.org
Received :08 November 2002; revised version accepted : 19 May 2003
The use of 13C NMR spectra for the determination of the syn and anti configuration of a , b -unsaturated oximes and hydrazones is discribed. Condensation of hydroxylamine to b -ionone results in the formation of two diastereoisomers, syn and anti, However, addition of hydrazines to b -ionone is totally stereoselective, only one diasteroisomer is obtained. The same result is observed with hydrazones of a -ionone.
Keywords : a -ionone and b -ionone; Oximes; Hydrazones.