Piece by piece: Hydrazides at zirconium centers undergo facile NN bond cleavage and react as equivalents for metallanitrenes, thus allowing the atom-by-atom assembly of bridging dinitridosulfate(IV) and dinitridoselenate(IV) ligands (see scheme; TBS=tBuMe2Si).
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Herrmann et al. (2007) studied this question.
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