prov:value
| - Suitable catalysts include, for example, acids, bases, salts, free radical forming materials, 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: organic peroxides and hydroperoxides such as t-butylperoxy
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