Chemistry of the metal carbonyls. Part XLVII. Reactions of 3,3,3-trifluoropropyne

Abstract

Hydridopentacarbonylrhenium reacts with 3,3,3-trifluoropropyne to give cis-CF₃·CH:CH·Re(CO)₅ as principal product. The hydride HFe(CO)₂(π-C₅H₅) affords a mixture of cis-CF₃·CH:CH·Fe(CO)₂(π-C₅H₅) and CH₂:C(CF₃)·Fe(CO)₂(π-C₅H₅), in which the latter predominates: while trans-(Et₃P)₂Pt(H)Cl affords cis-(Et₃P)₂Pt(C(CF₃):CH₂)Cl. Reaction between hydridopentacarbonylmaganese and the acetylene gives a mixture of CH₂:C(CF₃)·Mn(CO)₅ and a tetracarbonyl complex, in larger yield, believed to have a cyclic structure (OC)₄M[graphic omitted]. Methylpentacarbonylmanganese reacts to give apparently a similar tetracarbonyl manganese complex.

Reactions between 3,3,3-trifluoropropynne and (Ph₃P)₄Pt or (π-C₅H₅)₂Ni afford (Ph₃P)₂Pt(CF₃·C₂H) and [π-C₅H₅Ni]₂(CF₃·C₂H), respectively. Cobaltocene gives [π-C₅H₅]Co[π-C₅H₅(C⋮CCF₃)]. The reaction between octacarbonyldicobalt and the alkyne has also been studied and the complexes (CF₃·C₂H)Co₂(CO)₆ CF₃·CH₂·C[Co(CO)₃]₃ and (CF₃·C₂H)₃Co₂(CO)₄ isolated.