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Not all down-to-Earth: A stable aluminacyclopropene LAl(η2-C2H2) 1 was isolated from the reaction of LAl with C2H2. Further reaction of 1 with C2H2 results in terminal CCH and CHCH2 groups at the Al center. The end-on insertion of an azide into one AlC bond in 1 leads to the first aluminaazacyclobutene 2. These reactions can be considered prebiotic, as AlI species and acetylene are found in outer space.
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Zhu et al. (2005) studied this question.
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