abstract |
The present invention relates to compositions containing new beta-diketones of formula (I) and of formula (II), R₁COCH₂COR₂ (I) R₂COCH₂COR₂ (II) which can be used to stabilize various polymers, such as polyvinyl chlorides (PVC). The present invention also relates to a method for preparing β-diketones by a Claisen condensation reaction, which is represented as follows: R₄COCHR₅H + R₆C (O) OR₇ + RO⁻ --- → [R₄COCR₅COR₆] - + R₇OH + ROH. |