Toluene is used as azeotrope in the preparation of ketal.
缩酮制备时，采用甲苯为共沸剂；
2
Cyclopentanone ethylene ketal was synthesized with I_2 as catalyst.
以单质碘为催化剂合成了环戊酮乙二缩酮。
3
The invention relates to garland chrysanthemum extract compounds, and a synthesis method and application thereof. The compounds have enol ether-spiro ketal-acetals and unsaturated side chains.