Chemistry Letters, Vol.32, No.3, 298-299, 2003
Sequential carbometalation/elimination reaction takes place between gallium enolate and chloroethyne
In the presence of GaCl3, silyl enol ethers are sequentially ethynylated at the a-carbon atom with chlorotrimethylsilyl-ethyne giving (alpha-enynylated, (alpha-endiynylated and alpha-entriynylated ketones.