| abstract |
A process for the protection of a compound having at least one reactive functional group selected from hydroxy, mercapto, carboxyl, amino and amide, with 3,4-dihydro-2H-pyran (DΗP), wherein said DΗP is obtained by contacting tetrahydrofurfuryl alcohol (TΗFA) entrained in a carrier gas with a catalyst comprising aluminium oxide (Al 2 O 3 ), and wherein the carrier gas is water vapor. |