| abstract |
A process for the preparation of Pregna-1, 4-diene - 3,20-dione-16,17-acetal-21 esters of Formula (I) by a green process chemistry using a combination of an ionic liquid, organic solvent optionally in the presence of an inorganic nitrite. Formula I, wherein R and R' represent a) R= H, R'-cyclohexyl or b) R=CO-CH (CH3) 2, R'=cyclohexyl or c) R=H, R'=CH2-CH2-CH3. |