168022-98-8Relevant academic research and scientific papers
Alkyne Insertions into the ?-Pd-C(sp2, ferrocene) Bond of Cyclopalladated Complexes containing Schiff Bases derived from Ferrocene. Crystal Structures of (R = H or Me)
Lopez, Concepcion,Bosque, Ramon,Solans, Xavier,Font-Bardia, Merce,Silver, Jack,Fern, George
, p. 1839 - 1850 (1995)
Reactions of di-μ-chloro-bridged cyclopalladated compounds (R = H, Ph or Me, R' = CH2Ph; R = H, R' = CH2CH2Ph) with alkynes R''CCR'' (R'' = Et or Ph) have been studied.In all cases these reactions produce nine-membered metallocycles (R'' = Et or Ph), which arise from a double insertion of the alkyne.Compounds (R = H 4a or Me 4d) have been characterized structurally.Complex 4a is monoclinic, space group C2/c, with a = 30.783(4), b = 11.320(2), c = 20.181(3) Angstroem and β = 27.23(3) deg; compound 4d is also monoclinic space group P21/a, with a = 20.308(4), b = 11.075(2), c = 12.565(2) Angstroem and β = 92.01(3) deg.These structural studies confirm the existence of a bicyclic system arising from the fusion of a nine-membered ring and the C5H3 moiety of the ferrocenyl moiety.The differences observed in the reactivity of the ?(Pd-Csp2, ferrocene) bond in the cyclopalladated compounds (R = H, Ph or Me) and in can be explained in terms of the electron donor ability of the chelated ligand.This property is reflected mainly in the redox potential of the iron centre.
