TaCl 5-silicagel and TaCl 5 as new Lewis acid systems for selective tetrahydropyranylation of alcohols and thioacetalisation, trimerisation and aldolisation of …
S Chandrasekhar, M Takhi, YR Reddy, S Mohapatra…
文献索引：Chandrasekhar; Takhi, Mohamed; Reddy, Y. Ravindra; Mohapatra, Suchismita; Rao, C. Rama; Reddy, K. Venkatram Tetrahedron, 1997 , vol. 53, # 44 p. 14997 - 15004
TaCl5 adsorbed on silicagel has been utilized for the first time as Lewis acid catalyst for protection of aldehydes and alcohols as thiocetals and THP ethers respectively. Similarly TaCl5 has been exploited as an useful Lewis acid for chemoselective trimerisation and/or aldolisation of aldehydes. Very active Lewis acid catalyst system comprising of TaCl5- silicagel has been utilized for thioacetalisation of aldehydes and tetrahydropyranylation of ...
