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Scheme 3. Reactions of 1,2-di(4-tert-butyl)diazene 1h with phosphaalkynes 2. aReactions of 1h (0.1 mmol) with phosphaalkynes 2 (0.2 mmol) in the presence of VCl2(thf)2 (20 mol%) in toluene (2.0 mL) at 110 °C for 16 h.