| http://www.w3.org/ns/prov#value | - 1 st component: at least one defined boron or aluminum compound, 2nd component: at least one uncharged compound which has at least one acidic hydrogen atom, 3rd component: at least one support, preferably an inorganic oxidic support and optionally as 4th component a base, preferably an organic nitrogen-containing base such as an amine, an aniline derivative or a nitrogen heterocycle.
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