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Diazene was trapped for the first time from solution by coordination to the complex [Fe(PPr3)-(SC6H4SCH2CH2SC6H4S)] (generated in situ) to form 1 in which it is in the trans configuration! This raises the question whether the cis-diazene structure postulated for N2H2 in solution is really indispensable to explain the stereoselective cis hydrogenations of multiple bonds by diazene.
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Sellmann et al. (1997) studied this question.
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