Dimerisation and reactivity of HCCCCFc at ruthenium centres
摘要:
In contrast to the simple diynyl complexes formed in reactions between HC CC CFc and MCl(dppe) Cp*; (M = Fe, Ru), an analogous reaction with RuCl(PPh(3))(2)Cp*: in the presence of KPF(6) and dbu resulted in dimerisation of the diyne at the Ru centre to afford a mixture of [Ru(eta(1),eta(2)-C(C CFc)=C(L)CH=CC=CHFc)(PPh(3))Cp*]PF(6) (L = dbu 1, PPh(3) 2). Similar reactions with RuCl(PR(3))(2)L gave [Ru{eta(1),eta(2)-C(C CFc)=C (dbu)CH=CC=CHFc}(PR(3))L]PF(6)(L = Cp, R = Ph 3, m-tol 4; L =.eta(5)-C(9)H(7), R = Ph 5). The reaction between 3 and 12, followed by crystallization of the paramagnetic product from MeOH, afforded the dicationic [Ru{C (C CFc)C(dbu)CH=C(OMe)C(OMe)=CHFc}(PPh(3))Cp](I(3))(2) 6. The molecular structures of 2 center dot 2CH(2)Cl(2) and 6.S (S = 2CH(2)Cl(2), C(6)H(6)) were determined by single-crystal XRD studies. (c) 2010 Elsevier B.V. All rights reserved.