Low-valent titanium reagents have an exceedingly high ability to promote the reductive coupling of carbonyl compounds and are attracting increasing interest in organic synthesis. A lot of other functional groups can also be coupled.1-2 View all references Although several results have been reported on saturated carbonyl compounds, only a few studies on the coupling α,β-unsaturated cabonyl compounds have been published.3-4 View all references Recently, we have ...