| 摘要 |
The invention relates to a novel process for producing compounds of the formula I <IMAGE> (I) in which R1 is for example phenyl, and R2 and R3 are for example cyclohexyl. With application of the phase-transfer catalysis method, a corresponding compound of the formula II <IMAGE> (II) is reacted, in the presence of water, with hydroxide ions, especially with alkali metal hydroxide or alkaline-earth metal hydroxide. |
