M. Sasidharan et R. Kumar, TITANIUM SILICATE MOLECULAR-SIEVES (TS-1 AND TS-2) CATALYZED MICHAEL REACTION OF SILYL ENOL ETHERS WITH ALPHA,BETA-UNSATURATED CARBONYL-COMPOUNDS, Catalysis letters, 38(3-4), 1996, pp. 251-254
The Michael addition reaction has been carried out with silyl enol eth
er and Michael accepters such as acrylates, and alpha,beta-unsaturated
ketones over aluminum-free titanium silicates (TS-1 and TS-2) in the
absence of H2O2. The reaction was carried out slightly above room temp
erature (40 degrees C) in the presence of dry solvents giving moderate
to good yield. The effect of various modified zeolites like RE-Y, La-
Y, steamed-Y, Na-Y, VS-1, SnS-1, Zn/ZSM-5 and different solvents has b
een studied. The catalytic activity is explained on the basis of ''oxo
philic Lewis acidity'' of titanium silicate molecular sieves.