prov:value
| - Suitable catalysts include, for example, acids, bases, salts, nitrogen and phosphorus compounds, such as for example, Lewis acids such as AlCl3, BF3, FeCl3, TiCl4, ZnCl2, SnCl4 ; protonic acids such as HCl, H3 PO4 ; aromatic hydroxy compounds such as phenol, p-nitrophenol, pyrocatechol, dihydroxynaphthalene; sodium hydroxide, sodium methylate, sodium phenolate, trimethylamine, triethylamine, tribu
|