Preparation of dinuclear vinylidene complexes and their new deprotonation reactions
Resource
Organometallics 26 (14): 3431-3439
Journal
Organometallics
Journal Volume
26
Journal Issue
14
Pages
3431-3439
Date Issued
2007
Author(s)
Abstract
The dinuclear dicationic vinylidene complex {[Ru]=C-C(Ph)CH 2C(CH2CN)=C=[Ru]}2+ (7a, [Ru] = Cp(PEt 3)2Ru) is prepared from the reaction of ICH2CN with {[Ru]=C=C(Ph)CH2C≡C[Ru]}+ (6a). Deprotonation of 7a by n-Bu4NOH is followed by a cyclization process yielding the stable complex 9a, containing a five-membered carbocyclic ring ligand, which is fully characterized by 2D-NMR analysis and a single-crystal X-ray diffraction analysis. Similarly deprotonation of {[Ru]=C=C(Ph)CH2C(CH 2-COOEt)=C=[Ru]}2+ (8a) gave the stable product lia containing a bridging ligand also with a similar five-membered carbocyclic ring. The cyclization process is affected by an ancillary ligand on the Ru metal center. Thus the analogous dinuclear complex 9b, with a bistriphenylphosphine ligand on one metal, which is prepared in a similar manner from {[Ru]=C=C(Ph)CH2C(CH2CN)=C=[Ru′]}2+ (7b, [Ru′] = Cp(PPh3)2Ru), is unstable, undergoing isomerization to give the dinuclear complex 10b, containing a cyclopropenyl ligand. © 2007 American Chemical Society.
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journal article
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