Abstrakt
Cocyclotrimerization of ferrocenylalkynes FcCdropCR (R = H and CH2OH) with alpha,omega-diynes X(CH(2)CdropCH)(2), where X = O, C(CO2Et), C(CN)(CO2Et), C(COMe)(2), and C(COMe)(CO2Et), to give functionalised ferrocenylarenes was attempted in the presence of various catalytic systems: [RhCl(PPh3)(3)], [CoBr(PPh3)(3)], [NiBr2(dppe)]/Zn, [(Ir(cod)Cl)(2)]/dppe and [CpCo(cod)]/PPh3 [Cp = η(5)-cyclopentadienyl, cod = η(4)-cyclo-octa-1,5-diene, and dppe = 1,2-bis(diphenylphosphanyl)ethane]. The results indicate that Wilkinson's catalyst effects the cocyclotrimerization to afford the respective ferrocenylarenes in good yields and under mild conditions regardless of the nature of the functional groups.