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Useful intermediates: Addition of silyl‐substituted chloroalkynes to terminal alkynes, namely chloroalkynylation, proceeds under palladium catalysis to afford (Z)‐1‐chloro‐1,3‐enynes (see scheme). The carbon–chlorine bond of the adducts is easily convertible to a carbon–carbon bond by using palladium‐catalyzed cross‐coupling reactions to provide a variety of 1,3‐enynes.
Nucleophilic addition of tri-2-furylgermane to various aldehydes and α,β-unsaturated carbonyl compounds in the presence of a catalytic amount of base such as t BuOK and Cs 2 CO 3 afforded α-hydroxy germanes and β-germyl carbonyl compounds, respectively, in good to excellent yields. The reaction of aldehydes proceeded with high chemoselectivity under mild conditions, so α-hydroxy...
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