103473-75-2Relevant academic research and scientific papers
CYCLOPENTADIENYLEISEN-KOMPLEXE MIT P(OR3)-LIGANDEN; SYNTHESE UND SPEKTROSKOPISCHE CHARAKTERISIERUNG
Schumann, Hans
, p. 75 - 92 (1985)
Reactions of reactive cyclopentadienyliron complexes C5H5Fe(CO)2I, BF4, BF4 and PF6 with P(OR)3 as ligands (R=CH3, C2H5, i-C3H7 and C6H5) lead to the formation of the complex compounds C5H5Fe(CO
Characterization of the organometallic Lewis acid (η5-C5H5)(CO)Fe(OR2)(η 2-CH2=CHCH3)+BF4-
Cutler, Alan R.,Todaro, Alicia B.
, p. 1782 - 1787 (2008/10/08)
Protonation of the η3-allyl complex Cp(CO)Fe(CH2CHCH2) (10) with HBF4·OEt2 or HBF4·OMe2 in CH2Cl2 (-80°C) affords an extremely reactive organometallic Lewis acid precursor, which degrades above -65°C. The structure assigned to this Lewis acid, on the basis of its 11B and 19F NMR spectral measurements and of its chemical reactivity, is Cp(CO)Fe(OR2)(CH2=CHCHg)+BF4 - (8). Similar NMR measurements are also reported for appropriate model compounds containing coordinated fluoroborate [e.g., Cp(CO)2FeFBF3 and Cp(CO)3MoFBF3] or ionic BF4- [e.g., Cp(CO)2Fe(THF)+BF4-]. Some potential ligands (e.g., THF) deprotonate 8 back to starting 10, whereas others (e.g., acetonitrile) readily convert 8 into examples of disubstituted complexes, Cp(CO)Fe(L1)(L2)+BF4-. Excess P(OPh)3, for example, converts 8 first to the η2-propene derivative Cp(CO)Fe(CH2=CHCH3)P(OPh)3+BF 4- (13) and then in refluxing CH2Cl2 to Cp(CO)Fe[P(OPh)3]2+BF4- (14). Reactions between 8 and the acetyl complexes Cp(CO)(L)FeCOCH3 (L = CO, PPh3) give the bimetallic μ-(η1-C,O)-acetyl compounds Cp(CO)(L)Fe-C(CH3)O-Fe(CO)2Cp+BF 4- (15) in low yields, with no evidence of forming μ-(η2-C,O)-acetyl derivatives Cp(CO)Fe(CH3CO)Fe(L)Cp+BF4-. The organometallic etherate complex Cp(CO)2Fe(OMe2)+BF4- (2a) results through protonolysis of Cp(CO)2FeCH3 with HBF4·OMe2 between -30 and -78°C. This unstable salt decomposes even at -55°C in CH2Cl2 or CDCl3 solution, as monitored by 1H and 19F NMR spectroscopy. The ether on 2a likewise is extremely labile; conditions are reported for replacing it by acetonitrile to give Cp(CO)2Fe(NCCH3)+BF4- (2c).
