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cis -RuCl 2 (L 2 ) 2 reacts with butadiyne in the presence of NaPF 6 to give the butatrienylidene intermediate trans -[RuCl(L 2 ) 2 C C C CH 2 ] +, which can be trapped with tertiary amines to afford the ammoniobutenynyl complexes trans -[RuCl(L 2 ) 2 C⋮C C(NR 3 ) CH 2 ] + (L 2 = dppm; R = Et, Pr). The respective N -allyl derivatives trans -[RuCl(L 2 ) 2 C⋮C C((NMe 2 )allyl) CH 2 ] + (L = dppm, depe) rearrange under ambient conditions via an aza-Cope process to the amino-substituted allenylidene complexes trans -[RuCl(L 2 ) 2 C C C(NMe 2 )(CH 2 ) 2 CH CH 2 ] + .
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Winter et al. (1997) studied this question.
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