Additions triisopropylsilyl trifluoromethanesulfonate

Conjugate Addition of Alkynylzinc Bromides. Alky nylzinc bromides undergo conjugate addition with a,p-unsaturated ketones in the presence of TBDMS triflate in ether-THF at —40°C to give the corresponding 1,4-adducts (54-96% yields). A representative example is illustrated in eq 7. Other trialkylsilyl triflates such as Triisopropylsilyl Trifluoromethanesulfonate or... 

Trifluoromethanesulfonic acid (0.226 mol) is added dropwise to triisopropylsilane (0.242 mol), stirred under an inert atmosphere and cooled to 0 °C in a flask fitted with dropping funnel, gas inlet, exit tubes and thermometer. After the addition is completed, stirring is continued at 22 °C for 16 h. Triisopropylsilyl triflate (97%) is isolated by the distillation through a 30 cm vacuum jacketed Vigreux column. 

---