| http://www.w3.org/ns/prov#value | - Examples of suitable catalysts are organic or inorganic acids, such as hydrochloric acid or acetic acid, and organic or inorganic bases, such as ammonia, alkali metal or alkaline earth metal hydroxides, for example sodium hydroxide, potassium hydroxide or calcium hydroxide, and amines which are soluble in the reaction medium, for example lower alkylamines or alkanolamines.
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