| http://www.w3.org/ns/prov#value | - Suitable catalysts include, for example, acids, bases, salts, nitrogen and phosphorus compounds, such as for example, Lewis acids such as AiCl8, BF8, FeCl8, 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
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