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RESEARCH PRODUCT

Formation of the Cationic [(2‐Aminoethenyl)carbine]iron Complexes by Treatment of (2‐Methoxyethenyl)carbene Complexes with Primary Amines:Synthesis and Characterisation

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description

Cationic (2-methoxyethenyl)methoxycarbene iron complexes 2, [Cp(CO)2Fe(C(OMe)CHCR(OMe))+][PF6−], are obtained by the addition of methanol to the corresponding (alkynyl)-methoxycarbene complexes 1, [Cp(CO)2Fe(C(OMe)CCR)+][PF6−]. Primary amines, H2NR', react with these 1,3-dimethoxy-substituted (alkenyl)carbene complexes, 2, through an addition/elimination process to yield cationic (2-aminoethenyl)methoxycarbene iron complexes, 3, [Cp(CO)2Fe(C(OMe)CHCR(NHR'))+][PF6−] in an isolated yield of 71–90%. The complexes 3a–c were characterized by X-ray structural analyses. Thus, previously isolated products, from the reaction, of the (alkynyl)methoxycarbene complexes 1a and 1c, with aniline at room temperature, are assigned to the structures 3c and 3e. The spectroscopic and structural data obtained are discussed.