Considerable interest recently has been shown in the reductive coupling of ketones and aldehydes to olefins, using low-valent titanium reagents,'accessible from TiC13 or TiC14 by reduction with Zn, 394 Mg, 6 Zn-Cu couple: K, Li, &J or LiAlH4. 8 Intramolecular dicarbonyl coupling to cycloalkenes is also possible in high yield, including medium sized rings. & This formal reverse of a double bond ozonolysis appears to have great synthetic potential. ...
![[4-[(E)-3-(4-acetyloxyphenyl)but-2-en-2-yl]phenyl] acetate Structure](https://image.chemsrc.com/caspic/049/70244-12-1.png)