... α- addition of the thiol to the α,β-unsaturated carbonyl com- pounds, a process that is ... The organic layer was washed (NaHCO3–H2O, brine), dried (MgSO4) and volatiles were evaporated ... Procedure A Titanium(IV) chloride (1.1 mL, 10 mmol) in carbon tetra- chloride (2.5 mL) was ...