Deprotonation reactions of the aminocarbyne complex trans-[ReCl(CNH2)(dppe)2][BF4](dppe = Ph2PCH2CH2PPh2). Synthesis and properties of the cyano-complexes trans-[Re(CN)L(dppe)2](L = NCR, N2, CO or CCHPh) and crystal structure of trans-[Re(CN)(NCMe)(dppe)2]PriOH
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