L. Eklund et al., PREPARATION OF (S)-4-METHYLCYCLOHEX-2-EN-1-ONE AND (R)-4-METHYLCYCLOHEX-2-EN-1-ONE, Journal of chemical research. Synopses, (2), 1995, pp. 62-63
(S)-4-Methylcyclohex-2-en-1-one of > 99% e.e. and its enantiomer of 90
% e.e. were prepared in seven steps (including a racemate resolution)
from commercial 1-methoxycyclohexa-1,4-diene.