| http://www.w3.org/ns/prov#value | - Compounds of the formula A are obtainable by reacting hydroxyorganoborines of the formula IV or diorganoborinic anhydrides of the formula V with organoaluminum compounds of the formula VI in which R6 is a hydrogen atom or a boron-free C1-C40-hydrocarbon-containing group, such as C1-C20-alkyl, C6-C20-aryl, C7-C40-arylalky or C7-C40-alkylaryl, and in which R1 are identical or different and are a hyd
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