Reaction of the cationic diiron .mu.-(.eta.1:.eta.2)acetylide complexes [(FP)2(C.tplbond.CR)]BF4 (R = H, Ph) with NaOMe

Abstract

The reaction of [(Fp*) 2 (C≡CH)]BF 4 (1a; Fp*=(η 5 -C 5 Me 5 )Fe(CO) 2 ) with NaOMe in THF results in deprotonation to afford Fp*C≡CFp*. On the other hand, the reaction of [(Fp) 2 (C≡CPh)]BF 4 (Fp=(η 5 -C 5 H 5 )Fe(CO) 2 ) with NaOMe produces the metallacyclic adduct Cp(OC)Fe[C-(Ph)=C(Fp)C(=O)OMe], whose structure has been confirmed by derivatization to (Z)-3-Fp(Ph)=C-(H)COOMe by acid hydrolysis. The reaction of [(Fp*) 2 (C≡CPh)]BF 4 witrh NaOMe gives a complicated mixture containing the mononuclear metallacyclic complex Cp*(OC)Fe[C(Ph)=C(H)C(=O)OMe] and the dinuclear μ-vinylidene complex (Cp*) 2 Fe 2 (CO) 2 (μ-CO)[μ-C=C(Ph)COOMe]