T. Shinada et al., STEREOCONTROLLED FUNCTIONALIZATION AT THE C-9 OF RETINAL - STEREOSELECTIVE SYNTHESIS OF 9-TRANS-9-FLUORORETINAL, Synlett, (12), 1995, pp. 1247
A general functionalization at the C-9 of retinal with 9-trans-selecti
vity is described. A palladium-catalyzed cross-coupling reaction of 6
and 7 afforded 6E-8, which was elaborated to 9-trans-9-fluororetinal v
ia the stereo- and regioselective isomerization.