The genuine balsam contains about 61⁄2% of benzoic (cinnamic) acid:—11.
Other constituents of the oil are cinnamyl acetate and cinnamic acid.
It is perfectly soluble in alcohol and in ether, and gives out its acid (benzoic or cinnamic) to water.
By the addition of diluted sulphuric acid, the aldehyde of cinnamic acid is afterwards procured pure.
It contains about 20% of cinnamic acid in addition to 18 or even more of benzoic.
An isomer of cinnamic acid known as allo-cinnamic acid is also known.
Wolff has converted this alcohol by oxidizing agents into cinnamic acid.