The boiling point of cinnamic acid is 3°C, which is relatively high. The condition of choosing the condenser tube is that the boiling point difference between the condensing medium and the substance is about 7°C, so the air condenser tube is chosen as the condensation reflux tube.

the boiling point is too high, about 15 degrees. The air condenses enough. Chromic acid is weak in oxidizing ability, and it can only oxidize alcohol hydroxyl group into ketone group, while potassium permanganate is a strong oxidant, which can directly oxidize alcohol hydroxyl group into carboxylic acid without obtaining ketone.

Extended information:

Properties and stability:

1. This product has low toxicity. LD525mg/kg in rats and LC516mg/kg in mice.

2. It exists in flue-cured tobacco leaves, oriental tobacco leaves and flue gas.

3. It naturally exists in China cinnamon oil, basil oil and other essential oils. There are two isomers, trans and cis, and the trans isomer is relatively stable. Cinnamic acid existing in nature and synthetic cinnamic acid are only trans.