A number of simple silyl enol ethers and vinyl trifluoromethanesulfonatea, a relatively new class of organic compounds capable of undergoing alkylation by a nucleophilic addition- elimination prows, were evaluated in the P388 lymphocytic leukemia system. No activity (ILS= 8-22%) was observed in the simple vinyl derivatives. Some activity (ILS= 20-42%) was observed for a series of siloxy and sulfonate (CH3S02 and CF a O a functionalized a- ...