Not germa-, stanna-, and plumbaethenes, but ylidic carbene adducts (depicted on the right) are obtained with bis(diisopropylamino)cyclopropenylidenes. The first main group metal complexes with this nucleophilic carbene are interesting alternatives to the intensively studied imidazol-2-ylidenes.
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Schumann et al. (1997) studied this question.
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