Molecular hydrogen stores and hydrogen transfer reagents for hydrogenation reactions

A process for reversible hydrogen storage, comprising the reaction of a material for reversible hydrogen storage, comprising at least one compound of the general formula (III), (IV), (VI), (VII), (VIII) or (IX) below, with molecular hydrogen in order to reversibly store it, and/or heating it to a temperature in the range from 50° C. to 150° C. and/or placing a material which has reversibly stored hydrogen, comprising at least one compound of the general formula (I), (II), (III), (V), (VI), (VII) or (VIII) below, under vacuum in order to release molecular hydrogen:

• where
• E is selected from the group consisting of B, Al and Ga,
• A is one of the following groups (X) to (XII):
• where the (X) to (XII) radicals may be substituted by one or more straight- or branched-chain C1-8-alkyl radicals aryl radicals and/or halogen atoms,
• X is from hydrogen, halogen, hydroxyl, thio, cyano, sulfo, carboxyl, a straight- or branched-chain C1-8-alkyl radical, a C3-7-cycloalkyl radical, a straight- or branched-chain C2-8-alkenyl radical, an aryl radical, a heterocyclic radical, an arylcarbonyl radical, a C1-8-alkylcarbonyl radical, a carbonyloxy radical, a sulfonyl radical, an amino radical, a C1-8-alkylamino radical, a C1-8-dialkylamino radical, an amido radical, a C1-8-alkylamido radical, a C1-8-dialkylamido radical, a C1-8-alkyloxycarbonylamino radical, an aryloxycarbonylamino radical, an amidino radical, a guanidino radical, a C1-8-alkyloxy radical, an aryloxy radical, an arylalkyloxy radical, a sulfonylamido radical, a C1-8-alkylsulfonylamido radical, an arylsulfonyl-amido radical, an amino acid radical or a protected acid radical,
• where the molecule may have two or more of the structural features shown in the formulae (I) to (IX),
• with the proviso that the compounds (I) to (IX) are capable either of absorbing and/or releasing hydrogen.