916907-60-3Relevant academic research and scientific papers
Enolate-phosphane ligands providing a tool for the selective substitution of triphenylphosphane by carbon monoxide or trimethylphosphane in complex {Ru(Cp)[η2-P,O-Ph2PCH2C(tBu)=O](PPh 3)}[PF6], and subsequent reactivity towards terminal alkynes
Demerseman, Bernard,Toupet, Loic
, p. 1573 - 1581 (2006)
The deprotonation under basic conditions of the keto-phosphane ligand in complexes (Ru(Cp)[η1-P-Ph2PCH2C(=O)-tBu] (PPh3) (L)} [PF6] (L = CO or PMe3) that arise from the addition of L to {Ru(Cp)[η2-P,O-Ph2PCH2C(tBu)=O](PPh 3)}[PF6] generates {Ru+(Cp)[η1-P-Ph2PCH=C(tBu)O -](PPh3) zwitterionic species, as shown by an X-ray crystal structure determination (L = CO). The removal of the triphenylphosphane ligand is subsequently achieved under thermal activation to afford the neutral derivatives Ru(Cp)[η2-P,O-Ph2PCH=C-(tBu)O](L). A further protonation step is sufficient to complete the formation of the new complex {Ru(Cp) [η2-P,O-Ph2PCH2C(tBu)=O](PMe 3)}[PF6], which reacts in methanol at reflux with 1,1-diphenyl-2-propyn-1-ol to afford the six-membered metallacyclic derivative {Ru(Cp) [η2-C,P:C(CH=CPh2)OC(tBu)=CH-PPh2](PMe 3)}[PF6], as shown by an X-ray single crystal analysis. The synthesis of related η5-indenyl ruthenium complexes and of {Ru(Cp)-(=C=CH2)[Ph2PCH2C(=O)tBu](PR 3)}[PF6] (PR3 = PPh3 or PMe3) vinylidene complexes is also reported. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
