prov:value
| - Preferred catalysts include inorganic acids (e.g., hydrochloric, nitric, sulfuric and hydrofluoric acid), amines including ammonia and ammonium hydroxide organic acids (e.g., acetic acid), bases (e.g., potassium hydroxide), potassium fluoride, metal alkoxides (e.g., titanium alkoxide, vanadium alkoxide).
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