Regardless of the amount of selenium used, the dihydride 1 (Ar=2,6-iPr2C6H3) reacts to afford 2. In solution, intermolecular elimination of H2Se takes place with formation of 3, which displays a bridging Al-Se-Al moiety. Compounds 2 and 3 are the first structurally characterized organometallic compounds which contain metal–SeH units.
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Cui et al. (2000) studied this question.