| http://www.w3.org/ns/prov#value | - The preferred bases are mixtures of an alkali metal hydroxide, especially sodium hydroxide, with a quaternary ammonium base or a phosphonium base, which is used, in the form of its halide, in catalytic amounts; examples of the second component are triethylbenzylammonium chloride, tetrabutylammonium bromide, dimethyldibenzylammonium chloride and tributylhexadecylphosphonium bromide.
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